* [patch 1/4] entry: Rework syscall_audit_enter()
From: Thomas Gleixner @ 2026-07-12 21:25 UTC (permalink / raw)
To: LKML
Cc: Michal Suchánek, Michael Ellerman, Shrikanth Hegde,
linuxppc-dev, Huacai Chen, loongarch, Paul Walmsley,
Palmer Dabbelt, linux-riscv, Sven Schnelle, linux-s390, x86,
Mark Rutland, Jinjie Ruan, Magnus Lindholm,
Mukesh Kumar Chaurasiya (IBM), Jonathan Corbet, Radu Rendec
In-Reply-To: <20260712134433.549076055@kernel.org>
Move it out of line and let it reread the syscall number on it's own. That
makes the low level entry code denser and allows to move the reread to the
call site of syscall_trace_enter() once the tracer is fixed up.
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
---
include/linux/entry-common.h | 14 +++-----------
kernel/entry/syscall-common.c | 10 ++++++++++
2 files changed, 13 insertions(+), 11 deletions(-)
--- a/include/linux/entry-common.h
+++ b/include/linux/entry-common.h
@@ -60,16 +60,7 @@ static __always_inline bool arch_ptrace_
long trace_syscall_enter(struct pt_regs *regs, long syscall);
void trace_syscall_exit(struct pt_regs *regs, long ret);
-
-static inline void syscall_enter_audit(struct pt_regs *regs, long syscall)
-{
- if (unlikely(audit_context())) {
- unsigned long args[6];
-
- syscall_get_arguments(current, regs, args);
- audit_syscall_entry(syscall, args[0], args[1], args[2], args[3]);
- }
-}
+void syscall_enter_audit(struct pt_regs *regs);
static __always_inline long syscall_trace_enter(struct pt_regs *regs, unsigned long work,
long syscall)
@@ -111,7 +102,8 @@ static __always_inline long syscall_trac
if (unlikely(work & SYSCALL_WORK_SYSCALL_TRACEPOINT))
syscall = trace_syscall_enter(regs, syscall);
- syscall_enter_audit(regs, syscall);
+ if (unlikely(audit_context()))
+ syscall_enter_audit(regs);
return syscall;
}
--- a/kernel/entry/syscall-common.c
+++ b/kernel/entry/syscall-common.c
@@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
+#include <linux/audit.h>
#include <linux/entry-common.h>
#define CREATE_TRACE_POINTS
@@ -21,3 +22,12 @@ void trace_syscall_exit(struct pt_regs *
{
trace_sys_exit(regs, ret);
}
+
+void syscall_enter_audit(struct pt_regs *regs)
+{
+ long syscall = syscall_get_nr(current, regs);
+ unsigned long args[6];
+
+ syscall_get_arguments(current, regs, args);
+ __audit_syscall_entry(syscall, args[0], args[1], args[2], args[3]);
+}
^ permalink raw reply
* [patch 0/4] entry: Rework syscall skip logic
From: Thomas Gleixner @ 2026-07-12 21:25 UTC (permalink / raw)
To: LKML
Cc: Michal Suchánek, Michael Ellerman, Shrikanth Hegde,
linuxppc-dev, Huacai Chen, loongarch, Paul Walmsley,
Palmer Dabbelt, linux-riscv, Sven Schnelle, linux-s390, x86,
Mark Rutland, Jinjie Ruan, Magnus Lindholm,
Mukesh Kumar Chaurasiya (IBM), Jonathan Corbet, Radu Rendec
This are the reworked leftovers of the larger entry logic rework series,
which can be found here:
https://lore.kernel.org/lkml/20260707181957.433213175@kernel.org
The undisputed part of the series has been merged into:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/entry
After a fruitless discussion about the most resilent approach, I decided to
give up wasting my time and reworked the series so it caters to the desire
of powerpc and s390 to be special.
That results in almost identical behavior except for the case where
tracing/probe/BPF sets the syscall number to -1 (or any other out of range
value) and also sets the syscall return value to something different than
-ENOSYS.
PowerPC and S390 will overwrite that value with -ENOSYS.
Loongarch, RISC-V and x86 will not overwrite it because those architectures
preset the return value to -ENOSYS and skip out of range syscalls
completely. Loongarch and RISC-V always did the out of range skip. X86
gained that in the already applied rework, which means that the final patch
which splits the skip decision from the syscall number does not longer
change x86 behavior for the above case.
Documentation is also updated and describes the two implementation variants
and the subtle difference in the resulting behavior.
The series applies on top of:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/entry
and is also available from git:
git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git entry/rework
Thanks,
tglx
---
Documentation/core-api/entry.rst | 45 +++++++++++++++++++++++-------
arch/loongarch/kernel/syscall.c | 14 ++++-----
arch/powerpc/kernel/syscall.c | 3 +-
arch/riscv/kernel/traps.c | 11 +++----
arch/s390/kernel/syscall.c | 7 +++-
arch/x86/entry/syscall_32.c | 25 ++++++++--------
arch/x86/entry/syscall_64.c | 12 ++++----
include/linux/entry-common.h | 58 +++++++++++++++++----------------------
kernel/entry/syscall-common.c | 19 ++++++++----
9 files changed, 110 insertions(+), 84 deletions(-)
^ permalink raw reply
* Re: ld.lld: error: relocation R_PPC_ADDR16_LO cannot be used against symbol 'init_task'; recompile with -fPIC
From: Nathan Chancellor @ 2026-07-12 20:41 UTC (permalink / raw)
To: Christophe Leroy (CS GROUP)
Cc: Feng Tang, kernel test robot, linuxppc-dev, Nick Desaulniers,
clang-built-linux, oe-kbuild-all, linux-kernel, Marek Szyprowski
In-Reply-To: <37fe4a15-e51b-411e-9667-a1c670f413e1@kernel.org>
On Fri, Jul 10, 2026 at 06:33:49AM +0200, Christophe Leroy (CS GROUP) wrote:
> + Clang
>
> Le 10/07/2026 à 04:51, Feng Tang a écrit :
> > Thanks for the report!
> >
> > Add Powerpc list.
>
> This is a Clang build with Clang linker, did you reproduce the problem with
> a normal GCC build ?
This does not reproduce with either the GNU toolchain or LLVM + the GNU
assembler. It only reproduces with clang's integrated assembler. I am
pretty sure I have seen this error before so I suspect that this
bisection is bogus like mentioned below.
> >
> > On Fri, Jul 10, 2026 at 06:18:50AM +0800, kernel test robot wrote:
> > > tree: https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kernel.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Ftorvalds%2Flinux.git&data=05%7C02%7Cchristophe.leroy2%40cs-soprasteria.com%7C016c05b801ba48f2593f08dede2e29c2%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639192487094863506%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=fQm6QfsJ2ggaKoRJWCz4dsaquz7Wo3uhRnOexVUrTnQ%3D&reserved=0 master
> > > head: 0e35b9b6ec0ffcc5e23cbdec09f5c622ad532b53
> > > commit: d5cae2261b86913e602452ce4a07e6aefc0f603b dma-contiguous: simplify numa cma area handling
> > > date: 6 weeks ago
> > > config: powerpc-randconfig-r133-20260709 (https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdownload.01.org%2F0day-ci%2Farchive%2F20260710%2F202607100652.WPUlEAfx-lkp%40intel.com%2Fconfig&data=05%7C02%7Cchristophe.leroy2%40cs-soprasteria.com%7C016c05b801ba48f2593f08dede2e29c2%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639192487094899182%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=BkT0BYyJtniz6YPzGpYbO0jn2T7vBDBLaK2Tsh1LcnE%3D&reserved=0)
> > > compiler: clang version 21.1.8 (https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fllvm%2Fllvm-project&data=05%7C02%7Cchristophe.leroy2%40cs-soprasteria.com%7C016c05b801ba48f2593f08dede2e29c2%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639192487094917538%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=5%2BLVtRoojuNbhEMr3BhM2xF50PV%2FIYh%2FWw3ipDIWG%2FY%3D&reserved=0 2078da43e25a4623cab2d0d60decddf709aaea28)
> > > sparse: v0.6.5-rc1
> > > reproduce (this is a W=1 build): (https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdownload.01.org%2F0day-ci%2Farchive%2F20260710%2F202607100652.WPUlEAfx-lkp%40intel.com%2Freproduce&data=05%7C02%7Cchristophe.leroy2%40cs-soprasteria.com%7C016c05b801ba48f2593f08dede2e29c2%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639192487094935016%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=%2BrpcCLuNecZIfyF6N5X%2FFcHhdG9YzLBAErvBGHyjjak%3D&reserved=0)
> >
> >
> > > All errors (new ones prefixed by >>):
> > >
> > > > > ld.lld: error: relocation R_PPC_ADDR16_LO cannot be used against symbol 'init_task'; recompile with -fPIC
> > > >>> defined in vmlinux.a(init/init_task.o)
> > > >>> referenced by head_44x.S:101 (arch/powerpc/kernel/head_44x.S:101)
> > > >>> arch/powerpc/kernel/head_44x.o:(.head.text+0x42) in archive vmlinux.a
> > > --
> > > > > ld.lld: error: relocation R_PPC_ADDR16_HI cannot be used against symbol 'init_thread_union'; recompile with -fPIC
> > > >>> defined in ./arch/powerpc/kernel/vmlinux.lds:133
> > > >>> referenced by head_44x.S:108 (arch/powerpc/kernel/head_44x.S:108)
> > > >>> arch/powerpc/kernel/head_44x.o:(.head.text+0x4e) in archive vmlinux.a
> >
> > I checked the patch and couldn't find obvious clue between the patch and
> > the error.
> >
> > commit d5cae2261b8691 only changes kernel/dma/contiguous.c, which is under
> > CONFIG_DMA_CMA per kernel/dma/Makefile. In your config above, CONFIG_DMA_CMA
> > is not even set, so the contigous.c should not be compiled. Could you help
> > to double check? thanks!
> >
> > - Feng
> >
> > > Kconfig warnings: (for reference only)
> > > WARNING: unmet direct dependencies detected for HOTPLUG_CPU
> > > Depends on [n]: SMP [=y] && (PPC_PSERIES [=n] || PPC_PMAC [=n] || PPC_POWERNV [=n] || FSL_SOC_BOOKE [=n])
> > > Selected by [y]:
> > > - PM_SLEEP_SMP [=y] && SMP [=y] && (ARCH_SUSPEND_POSSIBLE [=y] || ARCH_HIBERNATION_POSSIBLE [=y]) && PM_SLEEP [=y]
> > >
> > > --
> > > 0-DAY CI Kernel Test Service
> > > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fintel%2Flkp-tests%2Fwiki&data=05%7C02%7Cchristophe.leroy2%40cs-soprasteria.com%7C016c05b801ba48f2593f08dede2e29c2%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639192487094952205%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=sqz%2BJ2dpT3ZZjlQyyvAhgPdP9jS0kJLpbRKTcV4rM50%3D&reserved=0
> >
>
--
Cheers,
Nathan
^ permalink raw reply
* Re: [PATCH 00/29] ibmvfc: Add NVMe-FC support
From: Martin K. Petersen @ 2026-07-12 18:06 UTC (permalink / raw)
To: Tyrel Datwyler
Cc: james.bottomley, martin.petersen, linux-scsi, linuxppc-dev,
linux-kernel, brking, davemarq
In-Reply-To: <20260623013035.3436640-1-tyreld@linux.ibm.com>
Tyrel,
> This patch series adds NVMe-FC protocol support to the ibmvfc driver,
> enabling IBM POWER virtual Fibre Channel adapters to handle both SCSI
> and NVMe storage traffic through a unified driver architecture.
Applied to 7.3/scsi-staging, thanks!
--
Martin K. Petersen
^ permalink raw reply
* [PATCH] powerpc/ps3: Remove unused struct table in setup_areas()
From: Thorsten Blum @ 2026-07-12 15:13 UTC (permalink / raw)
To: Geoff Levand, Madhavan Srinivasan, Michael Ellerman,
Nicholas Piggin, Christophe Leroy (CS GROUP)
Cc: Thorsten Blum, linuxppc-dev, linux-kernel
The local table structure is not used - remove it.
Remove % in the comment while at it.
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
arch/powerpc/platforms/ps3/spu.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/arch/powerpc/platforms/ps3/spu.c b/arch/powerpc/platforms/ps3/spu.c
index e817def7f424..c904f9fa1caa 100644
--- a/arch/powerpc/platforms/ps3/spu.c
+++ b/arch/powerpc/platforms/ps3/spu.c
@@ -185,13 +185,11 @@ static void spu_unmap(struct spu *spu)
* The current HV requires the spu shadow regs to be mapped with the
* PTE page protection bits set as read-only.
*
- * Returns: %0 on success or -errno on error.
+ * Returns: 0 on success or -errno on error.
*/
static int __init setup_areas(struct spu *spu)
{
- struct table {char* name; unsigned long addr; unsigned long size;};
-
spu_pdata(spu)->shadow = ioremap_prot(spu_pdata(spu)->shadow_addr,
sizeof(struct spe_shadow),
pgprot_noncached_wc(PAGE_KERNEL_RO));
^ permalink raw reply related
* Re: [PATCH v3 0/3] selftests/mm: avoid false failures in hugetlb and KSM tests
From: Sayali Patil @ 2026-07-12 5:37 UTC (permalink / raw)
To: Andrew Morton
Cc: Shuah Khan, linux-mm, linux-kernel, linux-kselftest,
Ritesh Harjani, David Hildenbrand, Zi Yan, Michal Hocko,
Oscar Salvador, Lorenzo Stoakes, Dev Jain, Liam.Howlett,
linuxppc-dev, Miaohe Lin, Venkat Rao Bagalkote
In-Reply-To: <20260709185319.cbf0c39dd47ee3853d212b7b@linux-foundation.org>
On 10/07/26 07:23, Andrew Morton wrote:
> On Wed, 8 Jul 2026 12:29:04 +0530 Sayali Patil <sayalip@linux.ibm.com> wrote:
>
>> This series fixes issues in the hugetlb and KSM MM selftest categories
>> that can report failures when the prerequisites for the tests are not
>> satisfied.
>
> Thanks. AI review asked one question:
> https://sashiko.dev/#/patchset/cover.1783446924.git.sayalip@linux.ibm.com
Hi Andrew,
I answered this in v2, as the same question was raised by Sashiko:
https://lore.kernel.org/all/d73ef56f-077e-4995-993b-56b2c58b6b65@linux.ibm.com/
Thanks,
Sayali
^ permalink raw reply
* Re: [patch 13/18] entry: Make trace_syscall_enter() return type bool
From: Thomas Gleixner @ 2026-07-11 20:33 UTC (permalink / raw)
To: Michal Suchánek
Cc: LKML, Peter Zijlstra, Michael Ellerman, Shrikanth Hegde,
linuxppc-dev, Kees Cook, Huacai Chen, loongarch, Paul Walmsley,
Palmer Dabbelt, linux-riscv, Sven Schnelle, linux-s390, x86,
Mark Rutland, Jinjie Ruan, Andy Lutomirski, Oleg Nesterov,
Richard Henderson, Russell King, Catalin Marinas, Guo Ren,
Geert Uytterhoeven, Thomas Bogendoerfer, Helge Deller,
Yoshinori Sato, Richard Weinberger, Chris Zankel,
linux-arm-kernel, linux-alpha, linux-csky, linux-m68k, linux-mips,
linux-parisc, linux-sh, linux-um, Arnd Bergmann, Vineet Gupta,
Will Deacon, Brian Cain, Michal Simek, Dinh Nguyen,
David S. Miller, Andreas Larsson, linux-snps-arc, linux-hexagon,
linux-openrisc, sparclinux, linux-arch, Jonathan Corbet,
linux-doc
In-Reply-To: <alDQ7isUKJFl8Va4@kunlun.suse.cz>
Michal!
On Fri, Jul 10 2026 at 13:01, Michal Suchánek wrote:
> On Wed, Jul 08, 2026 at 10:34:38PM +0200, Thomas Gleixner wrote:
>> does not make #2 magically go away. It's still the same problem whether
>> you like it or not.
>
> However, reading the syscall number from pt_regs only after
> syscall_enter_from_user_mode exits does.
That does not solve anything at all.
TBH, your communication style is annoying as hell. You fail to provide
any useful arguments and explanations despite me giving you a proper
analysis. And I'm absolutely tired of this.
So let me try again for _ONE_ last time to explain you why your ppc/s390
world view is broken and let's look at the current code (irrelevant
portions omitted).
static __always_inline long syscall_trace_enter(struct pt_regs *regs, unsigned long work)
{
if (work & SYSCALL_WORK_SYSCALL_USER_DISPATCH) {
#1 if (syscall_user_dispatch(regs))
return -1L;
}
if (work & (SYSCALL_WORK_SYSCALL_TRACE | SYSCALL_WORK_SYSCALL_EMU)) {
#2 ret = arch_ptrace_report_syscall_entry(regs);
if (ret || (work & SYSCALL_WORK_SYSCALL_EMU))
return -1L;
}
/* Do seccomp after ptrace, to catch any tracer changes. */
if (work & SYSCALL_WORK_SECCOMP) {
#3 ret = __secure_computing();
if (ret == -1L)
return ret;
}
/* Either of the above might have changed the syscall number */
#4 syscall = syscall_get_nr(current, regs);
if (unlikely(work & SYSCALL_WORK_SYSCALL_TRACEPOINT))
#5 syscall = trace_syscall_enter(regs, syscall);
return syscall;
}
#1) The user dispatch mechanism does not modify the syscall return
value, but it can rollback the syscall and tell the call site to
skip the invocation.
The mechanism used in upstream today is to return -1L as the syscall
number which makes the architecture specific entry code skip the
syscall and refrain from touching the return value.
#2) ptrace
ptrace can poke whatever it wants into the syscall number storage
via ptrace_set_syscall_info_entry() -> syscall_set_nr()
It does not set the return code.
It does not abort the syscall when the poked syscall number is -1L.
It only aborts when a fatal signal is pending.
#3) seccomp
seccomp reads the syscall number, which might have been modified by
ptrace and acts upon it.
It can rewrite the syscall number even if it is -1 to begin with.
It can rewrite the return code if it decides to refuse the syscall
to be executed.
If it refuses the syscall to be executed it returns -1L.
#4) Rereading the syscall number after ptrace/seccomp
That's required to give the eventually modified number to the
tracer.
Obviously the tracer could do that on it's own, but with the current
implementation it expects the eventually modified syscall number
Changing that to make the tracer do it, is possible but does not
change any of the actual expectations. That's just cosmetic wankery.
#5) tracing
tracing can have a probe or bpf attached, which in turn can
- rewrite the syscall number
- set the return code in case that it sets the syscall number to
-1L
It can even set it in case it sets it to some other value, but
the architecture code has to be resilent against that no matter
what.
- if it does not set the return code when it sets the syscall
number to -1L then it has a historical expectation that the
syscall returns -ENOSYS
That's how it is and you can argue in circles and it's not going
away unless you have a great argument why you can break existing
user space probes/bpf scripts.
So now please provide in coherent sentences the argument why this solves
anything:
> However, reading the syscall number from pt_regs only after
> syscall_enter_from_user_mode exits does.
If you can, which I doubt, then please send a patch [series] against:
git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git entry/rework
with proper change logs explaining the superiour solution.
If not, please spare us the next set of incoherent "I wan't a pony"
mails.
Thanks,
tglx
^ permalink raw reply
* [PATCH v2 13/13] mm/mremap: convert mremap code to use vma_flags_t
From: Lorenzo Stoakes @ 2026-07-11 18:45 UTC (permalink / raw)
To: Andrew Morton, David Hildenbrand, Liam R. Howlett,
Vlastimil Babka, Mike Rapoport, Suren Baghdasaryan, Michal Hocko,
Thomas Bogendoerfer, Benjamin LaHaise, Alexander Viro,
Christian Brauner, Jan Kara, Hugh Dickins, Baolin Wang, Jann Horn,
Pedro Falcato, Muchun Song, Oscar Salvador, Zi Yan, Nico Pache,
Ryan Roberts, Dev Jain, Barry Song, Lance Yang, Usama Arif,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Simona Vetter, Lucas Stach,
Russell King, Christian Gmeiner, Inki Dae, Seung-Woo Kim,
Kyungmin Park, Krzysztof Kozlowski, Peter Griffin, Alim Akhtar,
Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
Rob Clark, Dmitry Baryshkov, Abhinav Kumar, Jessica Zhang,
Sean Paul, Marijn Suijten, Lyude Paul, Danilo Krummrich,
Tomi Valkeinen, Sandy Huang, Heiko Stübner, Andy Yan,
Thierry Reding, Mikko Perttunen, Jonathan Hunter, Gerd Hoffmann,
Dmitry Osipenko, Gurchetan Singh, Chia-I Wu, Zack Rusin,
Broadcom internal kernel review list, Matthew Brost,
Thomas Hellström, Oleksandr Andrushchenko, Helge Deller,
Kees Cook, Jaroslav Kysela, Takashi Iwai, Boris Brezillon,
Steven Price, Liviu Dudau
Cc: Lorenzo Stoakes, linux-mm, linux-kernel, linux-mips, linux-aio,
linux-fsdevel, linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-sound
In-Reply-To: <20260711-b4-vma-flags-mm-v2-0-0fa2357d5431@kernel.org>
Replace use of the legacy vm_flags_t flags with vma_flags_t values
throughout the mremap logic.
Note that, in replacing vm_flags_clear() (which takes the VMA write lock)
with vma_clear_flags() and vma_clear_flags_mask() (which do not)
respectively in unmap_source_vma() and dontunmap_complete(), we do not add
a VMA write lock to account for htis.
This is because, in both cases, move_vma() is their calling function and
this has already acquired the VMA write lock on vrm->vma whose VMA flags
are being cleared.
In the case of vma_set_flags() in unmap_source_vma() we do need to do this
- as prev and next were not necessarily write locked at this point.
Additionally update comments to reflect the changes to be consistent.
No functional change intended.
Reviewed-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
---
mm/mremap.c | 38 ++++++++++++++++++++------------------
1 file changed, 20 insertions(+), 18 deletions(-)
diff --git a/mm/mremap.c b/mm/mremap.c
index 384ef4cc2195..b64aa1f6e07e 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -68,7 +68,7 @@ struct vma_remap_struct {
bool populate_expand; /* mlock()'d expanded, must populate. */
enum mremap_type remap_type; /* expand, shrink, etc. */
bool mmap_locked; /* Is mm currently write-locked? */
- unsigned long charged; /* If VM_ACCOUNT, # pages to account. */
+ unsigned long charged; /* If VMA_ACCOUNT_BIT, # pgs to account */
bool vmi_needs_invalidate; /* Is the VMA iterator invalidated? */
};
@@ -963,7 +963,7 @@ static unsigned long vrm_set_new_addr(struct vma_remap_struct *vrm)
if (vrm->flags & MREMAP_FIXED)
map_flags |= MAP_FIXED;
- if (vma->vm_flags & VM_MAYSHARE)
+ if (vma_test(vma, VMA_MAYSHARE_BIT))
map_flags |= MAP_SHARED;
res = get_unmapped_area(vma->vm_file, new_addr, vrm->new_len, pgoff,
@@ -985,7 +985,7 @@ static bool vrm_calc_charge(struct vma_remap_struct *vrm)
{
unsigned long charged;
- if (!(vrm->vma->vm_flags & VM_ACCOUNT))
+ if (!vma_test(vrm->vma, VMA_ACCOUNT_BIT))
return true;
/*
@@ -1012,7 +1012,7 @@ static bool vrm_calc_charge(struct vma_remap_struct *vrm)
*/
static void vrm_uncharge(struct vma_remap_struct *vrm)
{
- if (!(vrm->vma->vm_flags & VM_ACCOUNT))
+ if (!vma_test(vrm->vma, VMA_ACCOUNT_BIT))
return;
vm_unacct_memory(vrm->charged);
@@ -1032,7 +1032,7 @@ static void vrm_stat_account(struct vma_remap_struct *vrm,
struct vm_area_struct *vma = vrm->vma;
vm_stat_account(mm, vma->vm_flags, pages);
- if (vma->vm_flags & VM_LOCKED)
+ if (vma_test(vma, VMA_LOCKED_BIT))
mm->locked_vm += pages;
}
@@ -1176,7 +1176,7 @@ static void unmap_source_vma(struct vma_remap_struct *vrm)
* arose, in which case we _do_ wish to unmap the _new_ VMA, which means
* we actually _do_ want it be unaccounted.
*/
- bool accountable_move = (vma->vm_flags & VM_ACCOUNT) &&
+ bool accountable_move = vma_test(vma, VMA_ACCOUNT_BIT) &&
!(vrm->flags & MREMAP_DONTUNMAP);
/*
@@ -1195,7 +1195,7 @@ static void unmap_source_vma(struct vma_remap_struct *vrm)
* portions of the original VMA that remain.
*/
if (accountable_move) {
- vm_flags_clear(vma, VM_ACCOUNT);
+ vma_clear_flags(vma, VMA_ACCOUNT_BIT);
/* We are about to split vma, so store the start/end. */
vm_start = vma->vm_start;
vm_end = vma->vm_end;
@@ -1220,8 +1220,8 @@ static void unmap_source_vma(struct vma_remap_struct *vrm)
* | |
* |-------------|
*
- * Having cleared VM_ACCOUNT from the whole VMA, after we unmap above
- * we'll end up with:
+ * Having cleared VMA_ACCOUNT_BIT from the whole VMA, after we unmap
+ * above we'll end up with:
*
* addr end
* | |
@@ -1241,13 +1241,15 @@ static void unmap_source_vma(struct vma_remap_struct *vrm)
if (vm_start < addr) {
struct vm_area_struct *prev = vma_prev(&vmi);
- vm_flags_set(prev, VM_ACCOUNT); /* Acquires VMA lock. */
+ vma_start_write(prev);
+ vma_set_flags(prev, VMA_ACCOUNT_BIT);
}
if (vm_end > end) {
struct vm_area_struct *next = vma_next(&vmi);
- vm_flags_set(next, VM_ACCOUNT); /* Acquires VMA lock. */
+ vma_start_write(next);
+ vma_set_flags(next, VMA_ACCOUNT_BIT);
}
}
}
@@ -1330,8 +1332,8 @@ static void dontunmap_complete(struct vma_remap_struct *vrm,
unsigned long old_start = vrm->vma->vm_start;
unsigned long old_end = vrm->vma->vm_end;
- /* We always clear VM_LOCKED[ONFAULT] on the old VMA. */
- vm_flags_clear(vrm->vma, VM_LOCKED_MASK);
+ /* We always clear VMA_LOCKED[ONFAULT]_BIT on the old VMA. */
+ vma_clear_flags_mask(vrm->vma, VMA_LOCKED_MASK);
/*
* anon_vma links of the old vma is no longer needed after its page
@@ -1767,14 +1769,14 @@ static int check_prep_vma(struct vma_remap_struct *vrm)
* based on the original. There are no known use cases for this
* behavior. As a result, fail such attempts.
*/
- if (!old_len && !(vma->vm_flags & (VM_SHARED | VM_MAYSHARE))) {
+ if (!old_len && !vma_test_any(vma, VMA_SHARED_BIT, VMA_MAYSHARE_BIT)) {
pr_warn_once("%s (%d): attempted to duplicate a private mapping with mremap. This is not supported.\n",
current->comm, current->pid);
return -EINVAL;
}
if ((vrm->flags & MREMAP_DONTUNMAP) &&
- (vma->vm_flags & (VM_DONTEXPAND | VM_PFNMAP)))
+ vma_test_any(vma, VMA_DONTEXPAND_BIT, VMA_PFNMAP_BIT))
return -EINVAL;
/*
@@ -1804,7 +1806,7 @@ static int check_prep_vma(struct vma_remap_struct *vrm)
return 0;
/* We are expanding and the VMA is mlock()'d so we need to populate. */
- if (vma->vm_flags & VM_LOCKED)
+ if (vma_test(vma, VMA_LOCKED_BIT))
vrm->populate_expand = true;
/* Need to be careful about a growing mapping */
@@ -1812,10 +1814,10 @@ static int check_prep_vma(struct vma_remap_struct *vrm)
if (pgoff + (new_len >> PAGE_SHIFT) < pgoff)
return -EINVAL;
- if (vma->vm_flags & (VM_DONTEXPAND | VM_PFNMAP))
+ if (vma_test_any(vma, VMA_DONTEXPAND_BIT, VMA_PFNMAP_BIT))
return -EFAULT;
- if (!mlock_future_ok(mm, vma->vm_flags & VM_LOCKED, vrm->delta))
+ if (!mlock_future_ok(mm, vma_test(vma, VMA_LOCKED_BIT), vrm->delta))
return -EAGAIN;
if (!may_expand_vm(mm, &vma->flags, vrm->delta >> PAGE_SHIFT))
--
2.55.0
^ permalink raw reply related
* [PATCH v2 12/13] mm/mprotect: convert mprotect code to use vma_flags_t
From: Lorenzo Stoakes @ 2026-07-11 18:45 UTC (permalink / raw)
To: Andrew Morton, David Hildenbrand, Liam R. Howlett,
Vlastimil Babka, Mike Rapoport, Suren Baghdasaryan, Michal Hocko,
Thomas Bogendoerfer, Benjamin LaHaise, Alexander Viro,
Christian Brauner, Jan Kara, Hugh Dickins, Baolin Wang, Jann Horn,
Pedro Falcato, Muchun Song, Oscar Salvador, Zi Yan, Nico Pache,
Ryan Roberts, Dev Jain, Barry Song, Lance Yang, Usama Arif,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Simona Vetter, Lucas Stach,
Russell King, Christian Gmeiner, Inki Dae, Seung-Woo Kim,
Kyungmin Park, Krzysztof Kozlowski, Peter Griffin, Alim Akhtar,
Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
Rob Clark, Dmitry Baryshkov, Abhinav Kumar, Jessica Zhang,
Sean Paul, Marijn Suijten, Lyude Paul, Danilo Krummrich,
Tomi Valkeinen, Sandy Huang, Heiko Stübner, Andy Yan,
Thierry Reding, Mikko Perttunen, Jonathan Hunter, Gerd Hoffmann,
Dmitry Osipenko, Gurchetan Singh, Chia-I Wu, Zack Rusin,
Broadcom internal kernel review list, Matthew Brost,
Thomas Hellström, Oleksandr Andrushchenko, Helge Deller,
Kees Cook, Jaroslav Kysela, Takashi Iwai, Boris Brezillon,
Steven Price, Liviu Dudau
Cc: Lorenzo Stoakes, linux-mm, linux-kernel, linux-mips, linux-aio,
linux-fsdevel, linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-sound
In-Reply-To: <20260711-b4-vma-flags-mm-v2-0-0fa2357d5431@kernel.org>
Replace use of the legacy vm_flags_t flags with vma_flags_t values
throughout the mprotect logic.
Note that we retain the legacy vm_flags_t bit shifting code in
do_mprotect_pkey(), deferring a vma_flags_t approach to this for the time
being.
Additionally update comments to reflect the changes to be consistent.
No functional change intended.
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
---
mm/mprotect.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/mm/mprotect.c b/mm/mprotect.c
index dc27bbc1712f..2888ee638d87 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -40,7 +40,7 @@
static bool maybe_change_pte_writable(struct vm_area_struct *vma, pte_t pte)
{
- if (WARN_ON_ONCE(!(vma->vm_flags & VM_WRITE)))
+ if (WARN_ON_ONCE(!vma_test(vma, VMA_WRITE_BIT)))
return false;
/* Don't touch entries that are not even readable. */
@@ -97,7 +97,7 @@ static bool can_change_shared_pte_writable(struct vm_area_struct *vma,
bool can_change_pte_writable(struct vm_area_struct *vma, unsigned long addr,
pte_t pte)
{
- if (!(vma->vm_flags & VM_SHARED))
+ if (!vma_test(vma, VMA_SHARED_BIT))
return can_change_private_pte_writable(vma, addr, pte);
return can_change_shared_pte_writable(vma, pte);
@@ -194,7 +194,7 @@ static __always_inline void set_write_prot_commit_flush_ptes(struct vm_area_stru
{
bool set_write;
- if (vma->vm_flags & VM_SHARED) {
+ if (vma_test(vma, VMA_SHARED_BIT)) {
set_write = can_change_shared_pte_writable(vma, ptent);
prot_commit_flush_ptes(vma, addr, ptep, oldpte, ptent, nr_ptes,
/* idx = */ 0, set_write, tlb);
@@ -846,8 +846,8 @@ mprotect_fixup(struct vma_iterator *vmi, struct mmu_gather *tlb,
vm_unacct_memory(nrpages);
/*
- * Private VM_LOCKED VMA becoming writable: trigger COW to avoid major
- * fault on access.
+ * Private VMA_LOCKED_BIT VMA becoming writable: trigger COW to avoid
+ * major fault on access.
*/
if (vma_flags_test(&new_vma_flags, VMA_WRITE_BIT) &&
vma_flags_test(&old_vma_flags, VMA_LOCKED_BIT) &&
@@ -921,7 +921,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
goto out;
start = vma->vm_start;
error = -EINVAL;
- if (!(vma->vm_flags & VM_GROWSDOWN))
+ if (!vma_test(vma, VMA_GROWSDOWN_BIT))
goto out;
} else {
if (vma->vm_start > start)
@@ -929,7 +929,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
if (unlikely(grows & PROT_GROWSUP)) {
end = vma->vm_end;
error = -EINVAL;
- if (!(vma->vm_flags & VM_GROWSUP))
+ if (!vma_test_single_mask(vma, VMA_GROWSUP))
goto out;
}
}
@@ -953,7 +953,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
}
/* Does the application expect PROT_READ to imply PROT_EXEC */
- if (rier && (vma->vm_flags & VM_MAYEXEC))
+ if (rier && vma_test(vma, VMA_MAYEXEC_BIT))
prot |= PROT_EXEC;
/*
--
2.55.0
^ permalink raw reply related
* [PATCH v2 11/13] mm/mlock: convert mlock code to use vma_flags_t
From: Lorenzo Stoakes @ 2026-07-11 18:45 UTC (permalink / raw)
To: Andrew Morton, David Hildenbrand, Liam R. Howlett,
Vlastimil Babka, Mike Rapoport, Suren Baghdasaryan, Michal Hocko,
Thomas Bogendoerfer, Benjamin LaHaise, Alexander Viro,
Christian Brauner, Jan Kara, Hugh Dickins, Baolin Wang, Jann Horn,
Pedro Falcato, Muchun Song, Oscar Salvador, Zi Yan, Nico Pache,
Ryan Roberts, Dev Jain, Barry Song, Lance Yang, Usama Arif,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Simona Vetter, Lucas Stach,
Russell King, Christian Gmeiner, Inki Dae, Seung-Woo Kim,
Kyungmin Park, Krzysztof Kozlowski, Peter Griffin, Alim Akhtar,
Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
Rob Clark, Dmitry Baryshkov, Abhinav Kumar, Jessica Zhang,
Sean Paul, Marijn Suijten, Lyude Paul, Danilo Krummrich,
Tomi Valkeinen, Sandy Huang, Heiko Stübner, Andy Yan,
Thierry Reding, Mikko Perttunen, Jonathan Hunter, Gerd Hoffmann,
Dmitry Osipenko, Gurchetan Singh, Chia-I Wu, Zack Rusin,
Broadcom internal kernel review list, Matthew Brost,
Thomas Hellström, Oleksandr Andrushchenko, Helge Deller,
Kees Cook, Jaroslav Kysela, Takashi Iwai, Boris Brezillon,
Steven Price, Liviu Dudau
Cc: Lorenzo Stoakes, linux-mm, linux-kernel, linux-mips, linux-aio,
linux-fsdevel, linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-sound
In-Reply-To: <20260711-b4-vma-flags-mm-v2-0-0fa2357d5431@kernel.org>
Replace use of the legacy vm_flags_t flags with vma_flags_t values
throughout the mlock logic.
Additionally update comments to reflect the changes to be consistent.
No functional change intended.
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
---
mm/mlock.c | 88 +++++++++++++++++++++++++++++++++-----------------------------
1 file changed, 47 insertions(+), 41 deletions(-)
diff --git a/mm/mlock.c b/mm/mlock.c
index 34ffa954006f..efa6716e4dfb 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -329,7 +329,7 @@ static inline bool allow_mlock_munlock(struct folio *folio,
* be split. And the pages are not in VM_LOCKed VMA
* can be reclaimed.
*/
- if (!(vma->vm_flags & VM_LOCKED))
+ if (!vma_test(vma, VMA_LOCKED_BIT))
return true;
/* folio_within_range() cannot take KSM, but any small folio is OK */
@@ -368,7 +368,7 @@ static int mlock_pte_range(pmd_t *pmd, unsigned long addr,
folio = pmd_folio(*pmd);
if (folio_is_zone_device(folio))
goto out;
- if (vma->vm_flags & VM_LOCKED)
+ if (vma_test(vma, VMA_LOCKED_BIT))
mlock_folio(folio);
else
munlock_folio(folio);
@@ -393,7 +393,7 @@ static int mlock_pte_range(pmd_t *pmd, unsigned long addr,
if (!allow_mlock_munlock(folio, vma, start, end, step))
goto next_entry;
- if (vma->vm_flags & VM_LOCKED)
+ if (vma_test(vma, VMA_LOCKED_BIT))
mlock_folio(folio);
else
munlock_folio(folio);
@@ -417,8 +417,8 @@ static int mlock_pte_range(pmd_t *pmd, unsigned long addr,
* @end - end of range in @vma
* @new_vma_flags - the new set of flags for @vma.
*
- * Called for mlock(), mlock2() and mlockall(), to set @vma VM_LOCKED;
- * called for munlock() and munlockall(), to clear VM_LOCKED from @vma.
+ * Called for mlock(), mlock2() and mlockall(), to set @vma VMA_LOCKED_BIT;
+ * called for munlock() and munlockall(), to clear VMA_LOCKED_BIT from @vma.
*/
static void mlock_vma_pages_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end,
@@ -431,14 +431,14 @@ static void mlock_vma_pages_range(struct vm_area_struct *vma,
/*
* There is a slight chance that concurrent page migration,
- * or page reclaim finding a page of this now-VM_LOCKED vma,
+ * or page reclaim finding a page of this now-VMA_LOCKED_BIT vma,
* will call mlock_vma_folio() and raise page's mlock_count:
* double counting, leaving the page unevictable indefinitely.
- * Communicate this danger to mlock_vma_folio() with VM_IO,
- * which is a VM_SPECIAL flag not allowed on VM_LOCKED vmas.
+ * Communicate this danger to mlock_vma_folio() with VMA_IO_BIT,
+ * which is a VMA_SPECIAL_FLAGS flag not allowed on VMA_LOCKED_BIT vmas.
* mmap_lock is held in write mode here, so this weird
* combination should not be visible to other mmap_lock users;
- * but WRITE_ONCE so rmap walkers must see VM_IO if VM_LOCKED.
+ * but WRITE_ONCE so rmap walkers must see VMA_IO_BIT if VMA_LOCKED_BIT.
*/
if (vma_flags_test(new_vma_flags, VMA_LOCKED_BIT))
vma_flags_set(new_vma_flags, VMA_IO_BIT);
@@ -458,7 +458,7 @@ static void mlock_vma_pages_range(struct vm_area_struct *vma,
/*
* mlock_fixup - handle mlock[all]/munlock[all] requests.
*
- * Filters out "special" vmas -- VM_LOCKED never gets set for these, and
+ * Filters out "special" vmas -- VMA_LOCKED_BIT never gets set for these, and
* munlock is a no-op. However, for some special vmas, we go ahead and
* populate the ptes.
*
@@ -466,24 +466,23 @@ static void mlock_vma_pages_range(struct vm_area_struct *vma,
*/
static int mlock_fixup(struct vma_iterator *vmi, struct vm_area_struct *vma,
struct vm_area_struct **prev, unsigned long start,
- unsigned long end, vm_flags_t newflags)
+ unsigned long end, vma_flags_t *new_vma_flags)
{
- vma_flags_t new_vma_flags = legacy_to_vma_flags(newflags);
const vma_flags_t old_vma_flags = vma->flags;
struct mm_struct *mm = vma->vm_mm;
int nr_pages;
int ret = 0;
- if (vma_flags_same_pair(&old_vma_flags, &new_vma_flags) ||
+ if (vma_flags_same_pair(&old_vma_flags, new_vma_flags) ||
vma_is_secretmem(vma) || !vma_supports_mlock(vma)) {
/*
- * Don't set VM_LOCKED or VM_LOCKONFAULT and don't count.
- * For secretmem, don't allow the memory to be unlocked.
+ * Don't set VMA_LOCKED_BIT or VMA_LOCKONFAULT_BIT and don't
+ * count. For secretmem, don't allow the memory to be unlocked.
*/
goto out;
}
- vma = vma_modify_flags(vmi, *prev, vma, start, end, &new_vma_flags);
+ vma = vma_modify_flags(vmi, *prev, vma, start, end, new_vma_flags);
if (IS_ERR(vma)) {
ret = PTR_ERR(vma);
goto out;
@@ -493,7 +492,7 @@ static int mlock_fixup(struct vma_iterator *vmi, struct vm_area_struct *vma,
* Keep track of amount of locked VM.
*/
nr_pages = (end - start) >> PAGE_SHIFT;
- if (!vma_flags_test(&new_vma_flags, VMA_LOCKED_BIT))
+ if (!vma_flags_test(new_vma_flags, VMA_LOCKED_BIT))
nr_pages = -nr_pages;
else if (vma_flags_test(&old_vma_flags, VMA_LOCKED_BIT))
nr_pages = 0;
@@ -502,15 +501,15 @@ static int mlock_fixup(struct vma_iterator *vmi, struct vm_area_struct *vma,
/*
* vm_flags is protected by the mmap_lock held in write mode.
* It's okay if try_to_unmap_one unmaps a page just after we
- * set VM_LOCKED, populate_vma_page_range will bring it back.
+ * set VMA_LOCKED_BIT, populate_vma_page_range will bring it back.
*/
- if (vma_flags_test(&new_vma_flags, VMA_LOCKED_BIT) &&
+ if (vma_flags_test(new_vma_flags, VMA_LOCKED_BIT) &&
vma_flags_test(&old_vma_flags, VMA_LOCKED_BIT)) {
/* No work to do, and mlocking twice would be wrong */
vma_start_write(vma);
- vma->flags = new_vma_flags;
+ vma->flags = *new_vma_flags;
} else {
- mlock_vma_pages_range(vma, start, end, &new_vma_flags);
+ mlock_vma_pages_range(vma, start, end, new_vma_flags);
}
out:
*prev = vma;
@@ -518,7 +517,7 @@ static int mlock_fixup(struct vma_iterator *vmi, struct vm_area_struct *vma,
}
static int apply_vma_lock_flags(unsigned long start, size_t len,
- vm_flags_t flags)
+ const vma_flags_t *flags)
{
unsigned long nstart, end, tmp;
struct vm_area_struct *vma, *prev;
@@ -543,18 +542,20 @@ static int apply_vma_lock_flags(unsigned long start, size_t len,
tmp = vma->vm_start;
for_each_vma_range(vmi, vma, end) {
int error;
- vm_flags_t newflags;
+ vma_flags_t newflags;
if (vma->vm_start != tmp)
return -ENOMEM;
- newflags = vma->vm_flags & ~VM_LOCKED_MASK;
- newflags |= flags;
+ newflags = vma->flags;
+ vma_flags_clear_mask(&newflags, VMA_LOCKED_MASK);
+ vma_flags_set_mask(&newflags, *flags);
+
/* Here we know that vma->vm_start <= nstart < vma->vm_end. */
tmp = vma->vm_end;
if (tmp > end)
tmp = end;
- error = mlock_fixup(&vmi, vma, &prev, nstart, tmp, newflags);
+ error = mlock_fixup(&vmi, vma, &prev, nstart, tmp, &newflags);
if (error)
return error;
tmp = vma_iter_end(&vmi);
@@ -589,7 +590,7 @@ static unsigned long count_mm_mlocked_page_nr(struct mm_struct *mm,
end = start + len;
for_each_vma_range(vmi, vma, end) {
- if (vma->vm_flags & VM_LOCKED) {
+ if (vma_test(vma, VMA_LOCKED_BIT)) {
if (start > vma->vm_start)
count -= (start - vma->vm_start);
if (end < vma->vm_end) {
@@ -615,7 +616,8 @@ static int __mlock_posix_error_return(long retval)
return retval;
}
-static __must_check int do_mlock(unsigned long start, size_t len, vm_flags_t flags)
+static __must_check int do_mlock(unsigned long start, size_t len,
+ vma_flags_t *flags)
{
unsigned long locked;
unsigned long lock_limit;
@@ -664,24 +666,27 @@ static __must_check int do_mlock(unsigned long start, size_t len, vm_flags_t fla
SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len)
{
- return do_mlock(start, len, VM_LOCKED);
+ vma_flags_t flags = mk_vma_flags(VMA_LOCKED_BIT);
+
+ return do_mlock(start, len, &flags);
}
SYSCALL_DEFINE3(mlock2, unsigned long, start, size_t, len, int, flags)
{
- vm_flags_t vm_flags = VM_LOCKED;
+ vma_flags_t vma_flags = mk_vma_flags(VMA_LOCKED_BIT);
if (flags & ~MLOCK_ONFAULT)
return -EINVAL;
if (flags & MLOCK_ONFAULT)
- vm_flags |= VM_LOCKONFAULT;
+ vma_flags_set(&vma_flags, VMA_LOCKONFAULT_BIT);
- return do_mlock(start, len, vm_flags);
+ return do_mlock(start, len, &vma_flags);
}
SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len)
{
+ vma_flags_t flags = EMPTY_VMA_FLAGS;
int ret;
start = untagged_addr(start);
@@ -691,7 +696,7 @@ SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len)
if (mmap_write_lock_killable(current->mm))
return -EINTR;
- ret = apply_vma_lock_flags(start, len, 0);
+ ret = apply_vma_lock_flags(start, len, &flags);
mmap_write_unlock(current->mm);
return ret;
@@ -705,14 +710,15 @@ SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len)
* There are a couple of subtleties with this. If mlockall() is called multiple
* times with different flags, the values do not necessarily stack. If mlockall
* is called once including the MCL_FUTURE flag and then a second time without
- * it, VM_LOCKED and VM_LOCKONFAULT will be cleared from mm->def_vma_flags.
+ * it, VMA_LOCKED_BIT and VMA_LOCKONFAULT_BIT will be cleared from
+ * mm->def_vma_flags.
*/
static int apply_mlockall_flags(int flags)
{
VMA_ITERATOR(vmi, current->mm, 0);
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma, *prev = NULL;
- vm_flags_t to_add = 0;
+ vma_flags_t to_add = EMPTY_VMA_FLAGS;
vma_flags_clear_mask(&mm->def_vma_flags, VMA_LOCKED_MASK);
if (flags & MCL_FUTURE) {
@@ -726,20 +732,20 @@ static int apply_mlockall_flags(int flags)
}
if (flags & MCL_CURRENT) {
- to_add |= VM_LOCKED;
+ vma_flags_set(&to_add, VMA_LOCKED_BIT);
if (flags & MCL_ONFAULT)
- to_add |= VM_LOCKONFAULT;
+ vma_flags_set(&to_add, VMA_LOCKONFAULT_BIT);
}
for_each_vma(vmi, vma) {
int error;
- vm_flags_t newflags;
+ vma_flags_t newflags = vma->flags;
- newflags = vma->vm_flags & ~VM_LOCKED_MASK;
- newflags |= to_add;
+ vma_flags_clear_mask(&newflags, VMA_LOCKED_MASK);
+ vma_flags_set_mask(&newflags, to_add);
error = mlock_fixup(&vmi, vma, &prev, vma->vm_start, vma->vm_end,
- newflags);
+ &newflags);
/* Ignore errors, but prev needs fixing up. */
if (error)
prev = vma;
--
2.55.0
^ permalink raw reply related
* [PATCH v2 10/13] mm/vma: convert miscellaneous uses of VMA flags in core mm
From: Lorenzo Stoakes @ 2026-07-11 18:45 UTC (permalink / raw)
To: Andrew Morton, David Hildenbrand, Liam R. Howlett,
Vlastimil Babka, Mike Rapoport, Suren Baghdasaryan, Michal Hocko,
Thomas Bogendoerfer, Benjamin LaHaise, Alexander Viro,
Christian Brauner, Jan Kara, Hugh Dickins, Baolin Wang, Jann Horn,
Pedro Falcato, Muchun Song, Oscar Salvador, Zi Yan, Nico Pache,
Ryan Roberts, Dev Jain, Barry Song, Lance Yang, Usama Arif,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Simona Vetter, Lucas Stach,
Russell King, Christian Gmeiner, Inki Dae, Seung-Woo Kim,
Kyungmin Park, Krzysztof Kozlowski, Peter Griffin, Alim Akhtar,
Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
Rob Clark, Dmitry Baryshkov, Abhinav Kumar, Jessica Zhang,
Sean Paul, Marijn Suijten, Lyude Paul, Danilo Krummrich,
Tomi Valkeinen, Sandy Huang, Heiko Stübner, Andy Yan,
Thierry Reding, Mikko Perttunen, Jonathan Hunter, Gerd Hoffmann,
Dmitry Osipenko, Gurchetan Singh, Chia-I Wu, Zack Rusin,
Broadcom internal kernel review list, Matthew Brost,
Thomas Hellström, Oleksandr Andrushchenko, Helge Deller,
Kees Cook, Jaroslav Kysela, Takashi Iwai, Boris Brezillon,
Steven Price, Liviu Dudau
Cc: Lorenzo Stoakes, linux-mm, linux-kernel, linux-mips, linux-aio,
linux-fsdevel, linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-sound
In-Reply-To: <20260711-b4-vma-flags-mm-v2-0-0fa2357d5431@kernel.org>
Update various uses of legacy flags in vma.c and mmap.c to the new
vma_flags_t type, updating comments alongside them to be consistent.
No functional change intended.
Reviewed-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
---
mm/mmap.c | 39 +++++++++++++++++++++------------------
mm/vma.c | 13 ++++++++-----
2 files changed, 29 insertions(+), 23 deletions(-)
diff --git a/mm/mmap.c b/mm/mmap.c
index 2076c70e7700..4bf26b0f1e6e 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -557,8 +557,8 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
}
/*
- * Set 'VM_NORESERVE' if we should not account for the
- * memory use of this mapping.
+ * Set VMA_NORESERVE_BIT if we should not account for the memory use
+ * of this mapping.
*/
if (flags & MAP_NORESERVE) {
/* We honor MAP_NORESERVE if allowed to overcommit */
@@ -985,7 +985,7 @@ struct vm_area_struct *find_extend_vma_locked(struct mm_struct *mm, unsigned lon
return NULL;
if (expand_stack_locked(prev, addr))
return NULL;
- if (prev->vm_flags & VM_LOCKED)
+ if (vma_test(prev, VMA_LOCKED_BIT))
populate_vma_page_range(prev, addr, prev->vm_end, NULL);
return prev;
}
@@ -1009,7 +1009,7 @@ struct vm_area_struct *find_extend_vma_locked(struct mm_struct *mm, unsigned lon
start = vma->vm_start;
if (expand_stack_locked(vma, addr))
return NULL;
- if (vma->vm_flags & VM_LOCKED)
+ if (vma_test(vma, VMA_LOCKED_BIT))
populate_vma_page_range(vma, addr, start, NULL);
return vma;
}
@@ -1134,18 +1134,18 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
*/
vma = vma_lookup(mm, start);
- if (!vma || !(vma->vm_flags & VM_SHARED)) {
+ if (!vma || !vma_test(vma, VMA_SHARED_BIT)) {
mmap_read_unlock(mm);
return -EINVAL;
}
- prot |= vma->vm_flags & VM_READ ? PROT_READ : 0;
- prot |= vma->vm_flags & VM_WRITE ? PROT_WRITE : 0;
- prot |= vma->vm_flags & VM_EXEC ? PROT_EXEC : 0;
+ prot |= vma_test(vma, VMA_READ_BIT) ? PROT_READ : 0;
+ prot |= vma_test(vma, VMA_WRITE_BIT) ? PROT_WRITE : 0;
+ prot |= vma_test(vma, VMA_EXEC_BIT) ? PROT_EXEC : 0;
flags &= MAP_NONBLOCK;
flags |= MAP_SHARED | MAP_FIXED | MAP_POPULATE;
- if (vma->vm_flags & VM_LOCKED)
+ if (vma_test(vma, VMA_LOCKED_BIT))
flags |= MAP_LOCKED;
/* Save vm_flags used to calculate prot and flags, and recheck later. */
@@ -1271,7 +1271,7 @@ unsigned long tear_down_vmas(struct mm_struct *mm, struct vma_iterator *vmi,
mmap_assert_write_locked(mm);
vma_iter_set(vmi, vma->vm_end);
do {
- if (vma->vm_flags & VM_ACCOUNT)
+ if (vma_test(vma, VMA_ACCOUNT_BIT))
nr_accounted += vma_pages(vma);
vma_mark_detached(vma);
remove_vma(vma);
@@ -1420,7 +1420,7 @@ static int special_mapping_split(struct vm_area_struct *vma, unsigned long addr)
{
/*
* Forbid splitting special mappings - kernel has expectations over
- * the number of pages in mapping. Together with VM_DONTEXPAND
+ * the number of pages in mapping. Together with VMA_DONTEXPAND_BIT
* the size of vma should stay the same over the special mapping's
* lifetime.
*/
@@ -1692,7 +1692,7 @@ bool mmap_read_lock_maybe_expand(struct mm_struct *mm,
return true;
}
- if (!(new_vma->vm_flags & VM_GROWSDOWN))
+ if (!vma_test(new_vma, VMA_GROWSDOWN_BIT))
return false;
mmap_write_lock(mm);
@@ -1742,7 +1742,7 @@ __latent_entropy int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
retval = vma_start_write_killable(mpnt);
if (retval < 0)
goto loop_out;
- if (mpnt->vm_flags & VM_DONTCOPY) {
+ if (vma_test(mpnt, VMA_DONTCOPY_BIT)) {
retval = vma_iter_clear_gfp(&vmi, mpnt->vm_start,
mpnt->vm_end, GFP_KERNEL);
if (retval)
@@ -1752,7 +1752,7 @@ __latent_entropy int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
continue;
}
charge = 0;
- if (mpnt->vm_flags & VM_ACCOUNT) {
+ if (vma_test(mpnt, VMA_ACCOUNT_BIT)) {
unsigned long len = vma_pages(mpnt);
if (security_vm_enough_memory_mm(oldmm, len)) /* sic */
@@ -1770,16 +1770,19 @@ __latent_entropy int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
retval = dup_userfaultfd(tmp, &uf);
if (retval)
goto fail_nomem_anon_vma_fork;
- if (tmp->vm_flags & VM_WIPEONFORK) {
+
+ if (vma_test(tmp, VMA_WIPEONFORK_BIT)) {
/*
- * VM_WIPEONFORK gets a clean slate in the child.
+ * VMA_WIPEONFORK_BIT gets a clean slate in the child.
* Don't prepare anon_vma until fault since we don't
* copy page for current vma.
*/
tmp->anon_vma = NULL;
} else if (anon_vma_fork(tmp, mpnt))
goto fail_nomem_anon_vma_fork;
- vm_flags_clear(tmp, VM_LOCKED_MASK);
+
+ vma_start_write(tmp);
+ vma_clear_flags_mask(tmp, VMA_LOCKED_MASK);
/*
* Copy/update hugetlb private vma information.
*/
@@ -1812,7 +1815,7 @@ __latent_entropy int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
i_mmap_unlock_write(mapping);
}
- if (!(tmp->vm_flags & VM_WIPEONFORK))
+ if (!vma_test(tmp, VMA_WIPEONFORK_BIT))
retval = copy_page_range(tmp, mpnt);
if (retval) {
diff --git a/mm/vma.c b/mm/vma.c
index e0ad895098a9..b5bc3eec961c 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -3419,17 +3419,20 @@ struct vm_area_struct *__install_special_mapping(
vm_flags_t vm_flags, void *priv,
const struct vm_operations_struct *ops)
{
- int ret;
+ vma_flags_t vma_flags = legacy_to_vma_flags(vm_flags);
struct vm_area_struct *vma;
+ int ret;
vma = vm_area_alloc(mm);
- if (unlikely(vma == NULL))
+ if (unlikely(!vma))
return ERR_PTR(-ENOMEM);
- vm_flags |= vma_flags_to_legacy(mm->def_vma_flags) | VM_DONTEXPAND;
+ vma_flags_set_mask(&vma_flags, mm->def_vma_flags);
+ vma_flags_set(&vma_flags, VMA_DONTEXPAND_BIT);
if (pgtable_supports_soft_dirty())
- vm_flags |= VM_SOFTDIRTY;
- vm_flags_init(vma, vm_flags & ~VM_LOCKED_MASK);
+ vma_flags_set(&vma_flags, VMA_SOFTDIRTY_BIT);
+ vma_flags_clear_mask(&vma_flags, VMA_LOCKED_MASK);
+ vma->flags = vma_flags;
vma->vm_page_prot = vma_get_page_prot(vma);
vma->vm_ops = ops;
--
2.55.0
^ permalink raw reply related
* [PATCH v2 09/13] mm/vma: update create_init_stack_vma() to use vma_flags_t
From: Lorenzo Stoakes @ 2026-07-11 18:45 UTC (permalink / raw)
To: Andrew Morton, David Hildenbrand, Liam R. Howlett,
Vlastimil Babka, Mike Rapoport, Suren Baghdasaryan, Michal Hocko,
Thomas Bogendoerfer, Benjamin LaHaise, Alexander Viro,
Christian Brauner, Jan Kara, Hugh Dickins, Baolin Wang, Jann Horn,
Pedro Falcato, Muchun Song, Oscar Salvador, Zi Yan, Nico Pache,
Ryan Roberts, Dev Jain, Barry Song, Lance Yang, Usama Arif,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Simona Vetter, Lucas Stach,
Russell King, Christian Gmeiner, Inki Dae, Seung-Woo Kim,
Kyungmin Park, Krzysztof Kozlowski, Peter Griffin, Alim Akhtar,
Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
Rob Clark, Dmitry Baryshkov, Abhinav Kumar, Jessica Zhang,
Sean Paul, Marijn Suijten, Lyude Paul, Danilo Krummrich,
Tomi Valkeinen, Sandy Huang, Heiko Stübner, Andy Yan,
Thierry Reding, Mikko Perttunen, Jonathan Hunter, Gerd Hoffmann,
Dmitry Osipenko, Gurchetan Singh, Chia-I Wu, Zack Rusin,
Broadcom internal kernel review list, Matthew Brost,
Thomas Hellström, Oleksandr Andrushchenko, Helge Deller,
Kees Cook, Jaroslav Kysela, Takashi Iwai, Boris Brezillon,
Steven Price, Liviu Dudau
Cc: Lorenzo Stoakes, linux-mm, linux-kernel, linux-mips, linux-aio,
linux-fsdevel, linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-sound
In-Reply-To: <20260711-b4-vma-flags-mm-v2-0-0fa2357d5431@kernel.org>
Replace use of the legacy vm_flags_t flags with vma_flags_t values in
create_init_stack_vma().
As part of this change we add VMA_STACK_EARLY and VMA_STACK_INCOMPLETE
vma_flags_t defines, and slightly rework create_init_stack_vma() for
clarity.
No functional change intended.
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
---
include/linux/mm.h | 4 ++++
mm/vma_exec.c | 18 +++++++++++-------
tools/testing/vma/include/dup.h | 4 ++++
3 files changed, 19 insertions(+), 7 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 1209db1a4b92..550fb92957d1 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -442,8 +442,10 @@ enum {
#define VM_STACK INIT_VM_FLAG(STACK)
#ifdef CONFIG_STACK_GROWSUP
#define VM_STACK_EARLY INIT_VM_FLAG(STACK_EARLY)
+#define VMA_STACK_EARLY mk_vma_flags(VMA_STACK_EARLY_BIT)
#else
#define VM_STACK_EARLY VM_NONE
+#define VMA_STACK_EARLY EMPTY_VMA_FLAGS
#endif
#ifdef CONFIG_ARCH_HAS_PKEYS
#define VM_PKEY_SHIFT ((__force int)VMA_HIGH_ARCH_0_BIT)
@@ -544,6 +546,8 @@ enum {
/* Bits set in the VMA until the stack is in its final location */
#define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ | VM_STACK_EARLY)
+#define VMA_STACK_INCOMPLETE_SETUP append_vma_flags( \
+ VMA_STACK_EARLY, VMA_RAND_READ_BIT, VMA_SEQ_READ_BIT)
#define TASK_EXEC_BIT ((current->personality & READ_IMPLIES_EXEC) ? \
VMA_EXEC_BIT : VMA_READ_BIT)
diff --git a/mm/vma_exec.c b/mm/vma_exec.c
index a3c6b05c65fe..7af1260689b9 100644
--- a/mm/vma_exec.c
+++ b/mm/vma_exec.c
@@ -112,15 +112,17 @@ int relocate_vma_down(struct vm_area_struct *vma, unsigned long shift)
int create_init_stack_vma(struct mm_struct *mm, struct vm_area_struct **vmap,
unsigned long *top_mem_p)
{
- unsigned long flags = VM_STACK_FLAGS | VM_STACK_INCOMPLETE_SETUP;
+ vma_flags_t flags = VMA_STACK_INCOMPLETE_SETUP;
+ struct vm_area_struct *vma;
int err;
- struct vm_area_struct *vma = vm_area_alloc(mm);
+ /* VMA_STACK_FLAGS and VMA_STACK_INCOMPLETE_SETUP must not overlap. */
+ VM_WARN_ON_ONCE(vma_flags_test_any_mask(&flags, VMA_STACK_FLAGS));
+
+ vma = vm_area_alloc(mm);
if (!vma)
return -ENOMEM;
- vma_set_anonymous(vma);
-
if (mmap_write_lock_killable(mm)) {
err = -EINTR;
goto err_free;
@@ -134,18 +136,20 @@ int create_init_stack_vma(struct mm_struct *mm, struct vm_area_struct **vmap,
if (err)
goto err_ksm;
+ vma_flags_set_mask(&flags, VMA_STACK_FLAGS);
+ vma_set_anonymous(vma);
+
/*
* Place the stack at the largest stack address the architecture
* supports. Later, we'll move this to an appropriate place. We don't
* use STACK_TOP because that can depend on attributes which aren't
* configured yet.
*/
- VM_WARN_ON_ONCE(VM_STACK_FLAGS & VM_STACK_INCOMPLETE_SETUP);
vma->vm_end = STACK_TOP_MAX;
vma->vm_start = vma->vm_end - PAGE_SIZE;
if (pgtable_supports_soft_dirty())
- flags |= VM_SOFTDIRTY;
- vm_flags_init(vma, flags);
+ vma_flags_set(&flags, VMA_SOFTDIRTY_BIT);
+ vma->flags = flags;
vma->vm_page_prot = vma_get_page_prot(vma);
err = insert_vm_struct(mm, vma);
diff --git a/tools/testing/vma/include/dup.h b/tools/testing/vma/include/dup.h
index 57c80924813d..64f38a83613e 100644
--- a/tools/testing/vma/include/dup.h
+++ b/tools/testing/vma/include/dup.h
@@ -245,8 +245,10 @@ enum {
#define VM_STACK INIT_VM_FLAG(STACK)
#ifdef CONFIG_STACK_GROWSUP
#define VM_STACK_EARLY INIT_VM_FLAG(STACK_EARLY)
+#define VMA_STACK_EARLY mk_vma_flags(VMA_STACK_EARLY_BIT)
#else
#define VM_STACK_EARLY VM_NONE
+#define VMA_STACK_EARLY EMPTY_VMA_FLAGS
#endif
#ifdef CONFIG_ARCH_HAS_PKEYS
#define VM_PKEY_SHIFT ((__force int)VMA_HIGH_ARCH_0_BIT)
@@ -315,6 +317,8 @@ enum {
/* Bits set in the VMA until the stack is in its final location */
#define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ | VM_STACK_EARLY)
+#define VMA_STACK_INCOMPLETE_SETUP append_vma_flags( \
+ VMA_STACK_EARLY, VMA_RAND_READ_BIT, VMA_SEQ_READ_BIT)
#define TASK_EXEC_BIT ((current->personality & READ_IMPLIES_EXEC) ? \
VM_EXEC_BIT : VM_READ_BIT)
--
2.55.0
^ permalink raw reply related
* [PATCH v2 08/13] mm: introduce vma_get_page_prot() and use it
From: Lorenzo Stoakes @ 2026-07-11 18:45 UTC (permalink / raw)
To: Andrew Morton, David Hildenbrand, Liam R. Howlett,
Vlastimil Babka, Mike Rapoport, Suren Baghdasaryan, Michal Hocko,
Thomas Bogendoerfer, Benjamin LaHaise, Alexander Viro,
Christian Brauner, Jan Kara, Hugh Dickins, Baolin Wang, Jann Horn,
Pedro Falcato, Muchun Song, Oscar Salvador, Zi Yan, Nico Pache,
Ryan Roberts, Dev Jain, Barry Song, Lance Yang, Usama Arif,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Simona Vetter, Lucas Stach,
Russell King, Christian Gmeiner, Inki Dae, Seung-Woo Kim,
Kyungmin Park, Krzysztof Kozlowski, Peter Griffin, Alim Akhtar,
Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
Rob Clark, Dmitry Baryshkov, Abhinav Kumar, Jessica Zhang,
Sean Paul, Marijn Suijten, Lyude Paul, Danilo Krummrich,
Tomi Valkeinen, Sandy Huang, Heiko Stübner, Andy Yan,
Thierry Reding, Mikko Perttunen, Jonathan Hunter, Gerd Hoffmann,
Dmitry Osipenko, Gurchetan Singh, Chia-I Wu, Zack Rusin,
Broadcom internal kernel review list, Matthew Brost,
Thomas Hellström, Oleksandr Andrushchenko, Helge Deller,
Kees Cook, Jaroslav Kysela, Takashi Iwai, Boris Brezillon,
Steven Price, Liviu Dudau
Cc: Lorenzo Stoakes, linux-mm, linux-kernel, linux-mips, linux-aio,
linux-fsdevel, linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-sound, Jani Nikula
In-Reply-To: <20260711-b4-vma-flags-mm-v2-0-0fa2357d5431@kernel.org>
There's a large number of vm_get_page_prot(vma->vm_flags) invocations. Make
life easier by introducing vma_get_page_prot() parameterised by the VMA.
This also makes converting vm_get_page_prot() to vma_flags_t easier.
Also update the userland VMA tests to reflect the change.
No functional change intended.
Acked-by: Zi Yan <ziy@nvidia.com>
Acked-by: Jani Nikula <jani.nikula@intel.com> # for i915
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de> # for DRM
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
---
drivers/gpu/drm/drm_gem.c | 2 +-
drivers/gpu/drm/drm_gem_dma_helper.c | 2 +-
drivers/gpu/drm/drm_gem_shmem_helper.c | 2 +-
drivers/gpu/drm/etnaviv/etnaviv_gem.c | 2 +-
drivers/gpu/drm/exynos/exynos_drm_gem.c | 6 +++---
drivers/gpu/drm/i915/gem/i915_gem_mman.c | 12 ++++++------
drivers/gpu/drm/msm/msm_gem.c | 2 +-
drivers/gpu/drm/nouveau/nouveau_gem.c | 2 +-
drivers/gpu/drm/omapdrm/omap_fbdev.c | 2 +-
drivers/gpu/drm/omapdrm/omap_gem.c | 6 +++---
drivers/gpu/drm/panthor/panthor_gem.c | 2 +-
drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 2 +-
drivers/gpu/drm/tegra/gem.c | 2 +-
drivers/gpu/drm/virtio/virtgpu_vram.c | 2 +-
drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c | 2 +-
drivers/gpu/drm/xe/xe_device.c | 2 +-
drivers/gpu/drm/xe/xe_mmio_gem.c | 2 +-
drivers/gpu/drm/xen/xen_drm_front_gem.c | 2 +-
drivers/video/fbdev/core/fb_io_fops.c | 2 +-
include/linux/mm.h | 11 ++++++++++-
mm/vma.c | 2 +-
mm/vma_exec.c | 2 +-
sound/core/memalloc.c | 2 +-
tools/testing/vma/include/dup.h | 5 +++++
24 files changed, 46 insertions(+), 32 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index e3ed684ddcf2..32a05d889b9a 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -1252,7 +1252,7 @@ int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
}
vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
- vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+ vma->vm_page_prot = pgprot_writecombine(vma_get_page_prot(vma));
vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
}
diff --git a/drivers/gpu/drm/drm_gem_dma_helper.c b/drivers/gpu/drm/drm_gem_dma_helper.c
index 1c00a71ab3c9..7d9612075d31 100644
--- a/drivers/gpu/drm/drm_gem_dma_helper.c
+++ b/drivers/gpu/drm/drm_gem_dma_helper.c
@@ -540,7 +540,7 @@ int drm_gem_dma_mmap(struct drm_gem_dma_object *dma_obj, struct vm_area_struct *
vm_flags_mod(vma, VM_DONTDUMP | VM_DONTEXPAND, VM_PFNMAP);
if (dma_obj->map_noncoherent) {
- vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ vma->vm_page_prot = vma_get_page_prot(vma);
ret = dma_mmap_pages(drm_dev_dma_dev(dma_obj->base.dev),
vma, vma->vm_end - vma->vm_start,
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index c989459eb215..06d019d51d3e 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -764,7 +764,7 @@ int drm_gem_shmem_mmap(struct drm_gem_shmem_object *shmem, struct vm_area_struct
return ret;
vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
- vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ vma->vm_page_prot = vma_get_page_prot(vma);
if (shmem->map_wc)
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
index 2e4d6d117ee2..f9c8b7b2bfc7 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -133,7 +133,7 @@ static int etnaviv_gem_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
- vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ vm_page_prot = vma_get_page_prot(vma);
if (etnaviv_obj->flags & ETNA_BO_WC) {
vma->vm_page_prot = pgprot_writecombine(vm_page_prot);
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index 9a6270f3dca6..0208c9259572 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -377,13 +377,13 @@ static int exynos_drm_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct
/* non-cachable as default. */
if (exynos_gem->flags & EXYNOS_BO_CACHABLE)
- vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ vma->vm_page_prot = vma_get_page_prot(vma);
else if (exynos_gem->flags & EXYNOS_BO_WC)
vma->vm_page_prot =
- pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+ pgprot_writecombine(vma_get_page_prot(vma));
else
vma->vm_page_prot =
- pgprot_noncached(vm_get_page_prot(vma->vm_flags));
+ pgprot_noncached(vma_get_page_prot(vma));
ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma);
if (ret)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
index 0644f85c6c8e..9ca90c1bb5b4 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -112,7 +112,7 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
vma = find_vma(mm, addr);
if (vma && __vma_matches(vma, obj->base.filp, addr, args->size))
vma->vm_page_prot =
- pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+ pgprot_writecombine(vma_get_page_prot(vma));
else
addr = -ENOMEM;
mmap_write_unlock(mm);
@@ -1024,7 +1024,7 @@ i915_gem_object_mmap(struct drm_i915_gem_object *obj,
fput(anon);
if (obj->ops->mmap_ops) {
- vma->vm_page_prot = pgprot_decrypted(vm_get_page_prot(vma->vm_flags));
+ vma->vm_page_prot = pgprot_decrypted(vma_get_page_prot(vma));
vma->vm_ops = obj->ops->mmap_ops;
vma->vm_private_data = obj->base.vma_node.driver_private;
return 0;
@@ -1035,7 +1035,7 @@ i915_gem_object_mmap(struct drm_i915_gem_object *obj,
switch (mmo->mmap_type) {
case I915_MMAP_TYPE_WC:
vma->vm_page_prot =
- pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+ pgprot_writecombine(vma_get_page_prot(vma));
vma->vm_ops = &vm_ops_cpu;
break;
@@ -1043,19 +1043,19 @@ i915_gem_object_mmap(struct drm_i915_gem_object *obj,
GEM_WARN_ON(1);
fallthrough;
case I915_MMAP_TYPE_WB:
- vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ vma->vm_page_prot = vma_get_page_prot(vma);
vma->vm_ops = &vm_ops_cpu;
break;
case I915_MMAP_TYPE_UC:
vma->vm_page_prot =
- pgprot_noncached(vm_get_page_prot(vma->vm_flags));
+ pgprot_noncached(vma_get_page_prot(vma));
vma->vm_ops = &vm_ops_cpu;
break;
case I915_MMAP_TYPE_GTT:
vma->vm_page_prot =
- pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+ pgprot_writecombine(vma_get_page_prot(vma));
vma->vm_ops = &vm_ops_gtt;
break;
}
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index cbf723a5d86f..6a78e242de7c 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -1125,7 +1125,7 @@ static int msm_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct
struct msm_gem_object *msm_obj = to_msm_bo(obj);
vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
- vma->vm_page_prot = msm_gem_pgprot(msm_obj, vm_get_page_prot(vma->vm_flags));
+ vma->vm_page_prot = msm_gem_pgprot(msm_obj, vma_get_page_prot(vma));
return 0;
}
diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c
index 20dba02d6175..9a6ee2e880c0 100644
--- a/drivers/gpu/drm/nouveau/nouveau_gem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
@@ -55,7 +55,7 @@ static vm_fault_t nouveau_ttm_fault(struct vm_fault *vmf)
goto error_unlock;
nouveau_bo_del_io_reserve_lru(bo);
- prot = vm_get_page_prot(vma->vm_flags);
+ prot = vma_get_page_prot(vma);
ret = ttm_bo_vm_fault_reserved(vmf, prot, TTM_BO_VM_NUM_PREFAULT);
nouveau_bo_add_io_reserve_lru(bo);
if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
diff --git a/drivers/gpu/drm/omapdrm/omap_fbdev.c b/drivers/gpu/drm/omapdrm/omap_fbdev.c
index ca3fb186bf19..4881777642d2 100644
--- a/drivers/gpu/drm/omapdrm/omap_fbdev.c
+++ b/drivers/gpu/drm/omapdrm/omap_fbdev.c
@@ -84,7 +84,7 @@ static int omap_fbdev_pan_display(struct fb_var_screeninfo *var, struct fb_info
static int omap_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
- vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+ vma->vm_page_prot = pgprot_writecombine(vma_get_page_prot(vma));
return fb_deferred_io_mmap(info, vma);
}
diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c b/drivers/gpu/drm/omapdrm/omap_gem.c
index 00404fb6c29a..fb0e6f556b31 100644
--- a/drivers/gpu/drm/omapdrm/omap_gem.c
+++ b/drivers/gpu/drm/omapdrm/omap_gem.c
@@ -538,9 +538,9 @@ static int omap_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struc
vm_flags_set(vma, VM_DONTEXPAND | VM_DONTDUMP | VM_IO | VM_MIXEDMAP);
if (omap_obj->flags & OMAP_BO_WC) {
- vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+ vma->vm_page_prot = pgprot_writecombine(vma_get_page_prot(vma));
} else if (omap_obj->flags & OMAP_BO_UNCACHED) {
- vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
+ vma->vm_page_prot = pgprot_noncached(vma_get_page_prot(vma));
} else {
/*
* We do have some private objects, at least for scanout buffers
@@ -558,7 +558,7 @@ static int omap_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struc
vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
vma_set_file(vma, obj->filp);
- vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ vma->vm_page_prot = vma_get_page_prot(vma);
}
vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
diff --git a/drivers/gpu/drm/panthor/panthor_gem.c b/drivers/gpu/drm/panthor/panthor_gem.c
index a1e2eb1ca7bb..770556353968 100644
--- a/drivers/gpu/drm/panthor/panthor_gem.c
+++ b/drivers/gpu/drm/panthor/panthor_gem.c
@@ -776,7 +776,7 @@ static int panthor_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *v
}
vm_flags_set(vma, VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
- vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ vma->vm_page_prot = vma_get_page_prot(vma);
if (should_map_wc(bo))
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
index b188539dca0b..9a1dc9f12072 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
@@ -255,7 +255,7 @@ static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
*/
vm_flags_mod(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP, VM_PFNMAP);
- vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+ vma->vm_page_prot = pgprot_writecombine(vma_get_page_prot(vma));
vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
if (rk_obj->pages)
diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index 1d8d27a5ea89..f76af733ea79 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -602,7 +602,7 @@ int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
vma->vm_pgoff = vm_pgoff;
} else {
- pgprot_t prot = vm_get_page_prot(vma->vm_flags);
+ pgprot_t prot = vma_get_page_prot(vma);
vm_flags_mod(vma, VM_MIXEDMAP, VM_PFNMAP);
diff --git a/drivers/gpu/drm/virtio/virtgpu_vram.c b/drivers/gpu/drm/virtio/virtgpu_vram.c
index 4ae3cbc35dd3..544a6abddbc8 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vram.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vram.c
@@ -55,7 +55,7 @@ static int virtio_gpu_vram_mmap(struct drm_gem_object *obj,
vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
vm_flags_set(vma, VM_MIXEDMAP | VM_DONTEXPAND);
- vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ vma->vm_page_prot = vma_get_page_prot(vma);
vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
vma->vm_ops = &virtio_gpu_vram_vm_ops;
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c b/drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c
index 45561bc1c9ef..a9fd4015a0ca 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c
@@ -481,7 +481,7 @@ vm_fault_t vmw_bo_vm_fault(struct vm_fault *vmf)
if (vbo->dirty && vbo->dirty->method == VMW_BO_DIRTY_MKWRITE)
prot = vm_get_page_prot(vma->vm_flags & ~VM_SHARED);
else
- prot = vm_get_page_prot(vma->vm_flags);
+ prot = vma_get_page_prot(vma);
ret = ttm_bo_vm_fault_reserved(vmf, prot, num_prefault);
if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c
index abe25aedeead..838797cc65d7 100644
--- a/drivers/gpu/drm/xe/xe_device.c
+++ b/drivers/gpu/drm/xe/xe_device.c
@@ -281,7 +281,7 @@ static vm_fault_t barrier_fault(struct vm_fault *vmf)
pgprot_t prot;
int idx;
- prot = vm_get_page_prot(vma->vm_flags);
+ prot = vma_get_page_prot(vma);
if (drm_dev_enter(dev, &idx)) {
unsigned long pfn;
diff --git a/drivers/gpu/drm/xe/xe_mmio_gem.c b/drivers/gpu/drm/xe/xe_mmio_gem.c
index 8c803ef233cc..3741ae60f532 100644
--- a/drivers/gpu/drm/xe/xe_mmio_gem.c
+++ b/drivers/gpu/drm/xe/xe_mmio_gem.c
@@ -149,7 +149,7 @@ static int xe_mmio_gem_mmap(struct drm_gem_object *base, struct vm_area_struct *
/* Set vm_pgoff (used as a fake buffer offset by DRM) to 0 */
vma->vm_pgoff = 0;
- vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
+ vma->vm_page_prot = pgprot_noncached(vma_get_page_prot(vma));
vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP |
VM_DONTCOPY | VM_NORESERVE);
diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.c b/drivers/gpu/drm/xen/xen_drm_front_gem.c
index eec4c1da3f9e..dd158443f55f 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_gem.c
+++ b/drivers/gpu/drm/xen/xen_drm_front_gem.c
@@ -80,7 +80,7 @@ static int xen_drm_front_gem_object_mmap(struct drm_gem_object *gem_obj,
* which is mapped as Normal Inner Write-Back Outer Write-Back
* Inner-Shareable.
*/
- vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ vma->vm_page_prot = vma_get_page_prot(vma);
/*
* vm_operations_struct.fault handler will be called if CPU access
diff --git a/drivers/video/fbdev/core/fb_io_fops.c b/drivers/video/fbdev/core/fb_io_fops.c
index 6ab60fcd0050..6d0a8c8e141a 100644
--- a/drivers/video/fbdev/core/fb_io_fops.c
+++ b/drivers/video/fbdev/core/fb_io_fops.c
@@ -161,7 +161,7 @@ int fb_io_mmap(struct fb_info *info, struct vm_area_struct *vma)
len = info->fix.mmio_len;
}
- vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ vma->vm_page_prot = vma_get_page_prot(vma);
vma->vm_page_prot = pgprot_framebuffer(vma->vm_page_prot, vma->vm_start,
vma->vm_end, start);
diff --git a/include/linux/mm.h b/include/linux/mm.h
index b8fe40f89d87..1209db1a4b92 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -4610,6 +4610,11 @@ static inline pgprot_t vma_flags_to_page_prot(vma_flags_t vma_flags)
return vm_get_page_prot(vm_flags);
}
+static inline pgprot_t vma_get_page_prot(const struct vm_area_struct *vma)
+{
+ return vma_flags_to_page_prot(vma->flags);
+}
+
void vma_set_page_prot(struct vm_area_struct *vma);
#else
static inline pgprot_t vm_get_page_prot(vm_flags_t vm_flags)
@@ -4620,9 +4625,13 @@ static inline pgprot_t vma_flags_to_page_prot(vma_flags_t vma_flags)
{
return __pgprot(0);
}
+static inline pgprot_t vma_get_page_prot(const struct vm_area_struct *vma)
+{
+ return __pgprot(0);
+}
static inline void vma_set_page_prot(struct vm_area_struct *vma)
{
- vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ vma->vm_page_prot = vma_get_page_prot(vma);
}
#endif
diff --git a/mm/vma.c b/mm/vma.c
index 38481aca7321..e0ad895098a9 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -3430,7 +3430,7 @@ struct vm_area_struct *__install_special_mapping(
if (pgtable_supports_soft_dirty())
vm_flags |= VM_SOFTDIRTY;
vm_flags_init(vma, vm_flags & ~VM_LOCKED_MASK);
- vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ vma->vm_page_prot = vma_get_page_prot(vma);
vma->vm_ops = ops;
vma->vm_private_data = priv;
diff --git a/mm/vma_exec.c b/mm/vma_exec.c
index ef1fa2b161f3..a3c6b05c65fe 100644
--- a/mm/vma_exec.c
+++ b/mm/vma_exec.c
@@ -146,7 +146,7 @@ int create_init_stack_vma(struct mm_struct *mm, struct vm_area_struct **vmap,
if (pgtable_supports_soft_dirty())
flags |= VM_SOFTDIRTY;
vm_flags_init(vma, flags);
- vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ vma->vm_page_prot = vma_get_page_prot(vma);
err = insert_vm_struct(mm, vma);
if (err)
diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c
index 9320671dfcc8..5bc7e586b430 100644
--- a/sound/core/memalloc.c
+++ b/sound/core/memalloc.c
@@ -851,7 +851,7 @@ static void snd_dma_noncoherent_free(struct snd_dma_buffer *dmab)
static int snd_dma_noncoherent_mmap(struct snd_dma_buffer *dmab,
struct vm_area_struct *area)
{
- area->vm_page_prot = vm_get_page_prot(area->vm_flags);
+ area->vm_page_prot = vma_get_page_prot(area);
return dma_mmap_pages(dmab->dev.dev, area,
area->vm_end - area->vm_start,
virt_to_page(dmab->area));
diff --git a/tools/testing/vma/include/dup.h b/tools/testing/vma/include/dup.h
index 8621a7ae8980..57c80924813d 100644
--- a/tools/testing/vma/include/dup.h
+++ b/tools/testing/vma/include/dup.h
@@ -1573,3 +1573,8 @@ static inline void vma_assert_can_modify(struct vm_area_struct *vma)
if (vma_is_attached(vma))
vma_assert_write_locked(vma);
}
+
+static inline pgprot_t vma_get_page_prot(const struct vm_area_struct *vma)
+{
+ return vma_flags_to_page_prot(vma->flags);
+}
--
2.55.0
^ permalink raw reply related
* [PATCH v2 07/13] mm/vma: rename vma_get_page_prot to vma_flags_to_page_prot
From: Lorenzo Stoakes @ 2026-07-11 18:45 UTC (permalink / raw)
To: Andrew Morton, David Hildenbrand, Liam R. Howlett,
Vlastimil Babka, Mike Rapoport, Suren Baghdasaryan, Michal Hocko,
Thomas Bogendoerfer, Benjamin LaHaise, Alexander Viro,
Christian Brauner, Jan Kara, Hugh Dickins, Baolin Wang, Jann Horn,
Pedro Falcato, Muchun Song, Oscar Salvador, Zi Yan, Nico Pache,
Ryan Roberts, Dev Jain, Barry Song, Lance Yang, Usama Arif,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Simona Vetter, Lucas Stach,
Russell King, Christian Gmeiner, Inki Dae, Seung-Woo Kim,
Kyungmin Park, Krzysztof Kozlowski, Peter Griffin, Alim Akhtar,
Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
Rob Clark, Dmitry Baryshkov, Abhinav Kumar, Jessica Zhang,
Sean Paul, Marijn Suijten, Lyude Paul, Danilo Krummrich,
Tomi Valkeinen, Sandy Huang, Heiko Stübner, Andy Yan,
Thierry Reding, Mikko Perttunen, Jonathan Hunter, Gerd Hoffmann,
Dmitry Osipenko, Gurchetan Singh, Chia-I Wu, Zack Rusin,
Broadcom internal kernel review list, Matthew Brost,
Thomas Hellström, Oleksandr Andrushchenko, Helge Deller,
Kees Cook, Jaroslav Kysela, Takashi Iwai, Boris Brezillon,
Steven Price, Liviu Dudau
Cc: Lorenzo Stoakes, linux-mm, linux-kernel, linux-mips, linux-aio,
linux-fsdevel, linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-sound
In-Reply-To: <20260711-b4-vma-flags-mm-v2-0-0fa2357d5431@kernel.org>
Having vma_get_page_prot() refer to VMA flags and vma_set_page_prot() refer
to a VMA is confusing.
Rename vma_get_page_prot() to vma_flags_to_page_prot() to resolve this
confusion.
No functional change intended.
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
---
include/linux/mm.h | 4 ++--
mm/vma.c | 2 +-
mm/vma.h | 2 +-
tools/testing/vma/include/dup.h | 2 +-
4 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5b3825fddf58..b8fe40f89d87 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -4603,7 +4603,7 @@ static inline bool range_in_vma_desc(const struct vm_area_desc *desc,
#ifdef CONFIG_MMU
pgprot_t vm_get_page_prot(vm_flags_t vm_flags);
-static inline pgprot_t vma_get_page_prot(vma_flags_t vma_flags)
+static inline pgprot_t vma_flags_to_page_prot(vma_flags_t vma_flags)
{
const vm_flags_t vm_flags = vma_flags_to_legacy(vma_flags);
@@ -4616,7 +4616,7 @@ static inline pgprot_t vm_get_page_prot(vm_flags_t vm_flags)
{
return __pgprot(0);
}
-static inline pgprot_t vma_get_page_prot(vma_flags_t vma_flags)
+static inline pgprot_t vma_flags_to_page_prot(vma_flags_t vma_flags)
{
return __pgprot(0);
}
diff --git a/mm/vma.c b/mm/vma.c
index a74a0e467c63..38481aca7321 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -56,7 +56,7 @@ struct mmap_state {
.pglen = PHYS_PFN(len_), \
.vma_flags = vma_flags_, \
.file = file_, \
- .page_prot = vma_get_page_prot(vma_flags_), \
+ .page_prot = vma_flags_to_page_prot(vma_flags_), \
}
#define VMG_MMAP_STATE(name, map_, vma_) \
diff --git a/mm/vma.h b/mm/vma.h
index 8ca6e7e8ae28..0bc7d521e976 100644
--- a/mm/vma.h
+++ b/mm/vma.h
@@ -543,7 +543,7 @@ static inline bool vma_wants_manual_pte_write_upgrade(struct vm_area_struct *vma
#ifdef CONFIG_MMU
static inline pgprot_t vma_pgprot_modify(pgprot_t oldprot, vma_flags_t vma_flags)
{
- const pgprot_t prot = vma_get_page_prot(vma_flags);
+ const pgprot_t prot = vma_flags_to_page_prot(vma_flags);
return pgprot_modify(oldprot, prot);
}
diff --git a/tools/testing/vma/include/dup.h b/tools/testing/vma/include/dup.h
index 24955a1e318a..8621a7ae8980 100644
--- a/tools/testing/vma/include/dup.h
+++ b/tools/testing/vma/include/dup.h
@@ -1545,7 +1545,7 @@ static inline int get_sysctl_max_map_count(void)
#define pgtable_supports_soft_dirty() IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)
#endif
-static inline pgprot_t vma_get_page_prot(vma_flags_t vma_flags)
+static inline pgprot_t vma_flags_to_page_prot(vma_flags_t vma_flags)
{
const vm_flags_t vm_flags = vma_flags_to_legacy(vma_flags);
--
2.55.0
^ permalink raw reply related
* [PATCH v2 06/13] mm/vma: convert vm_pgprot_modify() to use vma_flags_t and rename
From: Lorenzo Stoakes @ 2026-07-11 18:45 UTC (permalink / raw)
To: Andrew Morton, David Hildenbrand, Liam R. Howlett,
Vlastimil Babka, Mike Rapoport, Suren Baghdasaryan, Michal Hocko,
Thomas Bogendoerfer, Benjamin LaHaise, Alexander Viro,
Christian Brauner, Jan Kara, Hugh Dickins, Baolin Wang, Jann Horn,
Pedro Falcato, Muchun Song, Oscar Salvador, Zi Yan, Nico Pache,
Ryan Roberts, Dev Jain, Barry Song, Lance Yang, Usama Arif,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Simona Vetter, Lucas Stach,
Russell King, Christian Gmeiner, Inki Dae, Seung-Woo Kim,
Kyungmin Park, Krzysztof Kozlowski, Peter Griffin, Alim Akhtar,
Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
Rob Clark, Dmitry Baryshkov, Abhinav Kumar, Jessica Zhang,
Sean Paul, Marijn Suijten, Lyude Paul, Danilo Krummrich,
Tomi Valkeinen, Sandy Huang, Heiko Stübner, Andy Yan,
Thierry Reding, Mikko Perttunen, Jonathan Hunter, Gerd Hoffmann,
Dmitry Osipenko, Gurchetan Singh, Chia-I Wu, Zack Rusin,
Broadcom internal kernel review list, Matthew Brost,
Thomas Hellström, Oleksandr Andrushchenko, Helge Deller,
Kees Cook, Jaroslav Kysela, Takashi Iwai, Boris Brezillon,
Steven Price, Liviu Dudau
Cc: Lorenzo Stoakes, linux-mm, linux-kernel, linux-mips, linux-aio,
linux-fsdevel, linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-sound
In-Reply-To: <20260711-b4-vma-flags-mm-v2-0-0fa2357d5431@kernel.org>
Update vm_pgprot_modify() to use the new VMA flags type vma_flags_t, and
rename to vma_pgprot_modify() accordingly.
This is part of the ongoing work to convert vm_flags_t to vma_flags_t, in
order to eliminate the arbitrary limit of the number of bits in a system
word on available VMA flags.
Update VMA userland tests accordingly, updating vma_set_page_prot() to no
longer inline vma_pgprot_modify(), rather we can simply define
vma_pgprot_modify() as a static inline function and the tests will pick it
up from vma.h.
No functional change intended.
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
---
mm/mmap.c | 8 ++++----
mm/vma.c | 2 +-
mm/vma.h | 6 ++++--
tools/testing/vma/include/dup.h | 12 +++++-------
4 files changed, 14 insertions(+), 14 deletions(-)
diff --git a/mm/mmap.c b/mm/mmap.c
index ae9a5018e20e..2076c70e7700 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -80,13 +80,13 @@ core_param(ignore_rlimit_data, ignore_rlimit_data, bool, 0644);
/* Update vma->vm_page_prot to reflect vma->vm_flags. */
void vma_set_page_prot(struct vm_area_struct *vma)
{
- vm_flags_t vm_flags = vma->vm_flags;
+ vma_flags_t vma_flags = vma->flags;
pgprot_t vm_page_prot;
- vm_page_prot = vm_pgprot_modify(vma->vm_page_prot, vm_flags);
+ vm_page_prot = vma_pgprot_modify(vma->vm_page_prot, vma_flags);
if (vma_wants_writenotify(vma, vm_page_prot)) {
- vm_flags &= ~VM_SHARED;
- vm_page_prot = vm_pgprot_modify(vm_page_prot, vm_flags);
+ vma_flags_clear(&vma_flags, VMA_SHARED_BIT);
+ vm_page_prot = vma_pgprot_modify(vm_page_prot, vma_flags);
}
/* remove_protection_ptes reads vma->vm_page_prot without mmap_lock */
WRITE_ONCE(vma->vm_page_prot, vm_page_prot);
diff --git a/mm/vma.c b/mm/vma.c
index 1f443d979a7d..a74a0e467c63 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -2176,7 +2176,7 @@ bool vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot)
/* The open routine did something to the protections that pgprot_modify
* won't preserve? */
if (pgprot_val(vm_page_prot) !=
- pgprot_val(vm_pgprot_modify(vm_page_prot, vma->vm_flags)))
+ pgprot_val(vma_pgprot_modify(vm_page_prot, vma->flags)))
return false;
/*
diff --git a/mm/vma.h b/mm/vma.h
index 4eb85b4a6adc..8ca6e7e8ae28 100644
--- a/mm/vma.h
+++ b/mm/vma.h
@@ -541,9 +541,11 @@ static inline bool vma_wants_manual_pte_write_upgrade(struct vm_area_struct *vma
}
#ifdef CONFIG_MMU
-static inline pgprot_t vm_pgprot_modify(pgprot_t oldprot, vm_flags_t vm_flags)
+static inline pgprot_t vma_pgprot_modify(pgprot_t oldprot, vma_flags_t vma_flags)
{
- return pgprot_modify(oldprot, vm_get_page_prot(vm_flags));
+ const pgprot_t prot = vma_get_page_prot(vma_flags);
+
+ return pgprot_modify(oldprot, prot);
}
#endif
diff --git a/tools/testing/vma/include/dup.h b/tools/testing/vma/include/dup.h
index 773e23303e26..24955a1e318a 100644
--- a/tools/testing/vma/include/dup.h
+++ b/tools/testing/vma/include/dup.h
@@ -1424,20 +1424,18 @@ struct vm_area_struct *vma_iter_next_range(struct vma_iterator *vmi)
}
bool vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot);
+static inline pgprot_t vma_pgprot_modify(pgprot_t oldprot, vma_flags_t vma_flags);
/* Update vma->vm_page_prot to reflect vma->vm_flags. */
static inline void vma_set_page_prot(struct vm_area_struct *vma)
{
- vm_flags_t vm_flags = vma->vm_flags;
+ vma_flags_t vma_flags = vma->flags;
pgprot_t vm_page_prot;
- /* testing: we inline vm_pgprot_modify() to avoid clash with vma.h. */
- vm_page_prot = pgprot_modify(vma->vm_page_prot, vm_get_page_prot(vm_flags));
-
+ vm_page_prot = vma_pgprot_modify(vma->vm_page_prot, vma_flags);
if (vma_wants_writenotify(vma, vm_page_prot)) {
- vm_flags &= ~VM_SHARED;
- /* testing: we inline vm_pgprot_modify() to avoid clash with vma.h. */
- vm_page_prot = pgprot_modify(vm_page_prot, vm_get_page_prot(vm_flags));
+ vma_flags_clear(&vma_flags, VMA_SHARED_BIT);
+ vm_page_prot = vma_pgprot_modify(vm_page_prot, vma_flags);
}
/* remove_protection_ptes reads vma->vm_page_prot without mmap_lock */
WRITE_ONCE(vma->vm_page_prot, vm_page_prot);
--
2.55.0
^ permalink raw reply related
* [PATCH v2 05/13] mm: prefer mm->def_vma_flags in mm logic
From: Lorenzo Stoakes @ 2026-07-11 18:45 UTC (permalink / raw)
To: Andrew Morton, David Hildenbrand, Liam R. Howlett,
Vlastimil Babka, Mike Rapoport, Suren Baghdasaryan, Michal Hocko,
Thomas Bogendoerfer, Benjamin LaHaise, Alexander Viro,
Christian Brauner, Jan Kara, Hugh Dickins, Baolin Wang, Jann Horn,
Pedro Falcato, Muchun Song, Oscar Salvador, Zi Yan, Nico Pache,
Ryan Roberts, Dev Jain, Barry Song, Lance Yang, Usama Arif,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Simona Vetter, Lucas Stach,
Russell King, Christian Gmeiner, Inki Dae, Seung-Woo Kim,
Kyungmin Park, Krzysztof Kozlowski, Peter Griffin, Alim Akhtar,
Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
Rob Clark, Dmitry Baryshkov, Abhinav Kumar, Jessica Zhang,
Sean Paul, Marijn Suijten, Lyude Paul, Danilo Krummrich,
Tomi Valkeinen, Sandy Huang, Heiko Stübner, Andy Yan,
Thierry Reding, Mikko Perttunen, Jonathan Hunter, Gerd Hoffmann,
Dmitry Osipenko, Gurchetan Singh, Chia-I Wu, Zack Rusin,
Broadcom internal kernel review list, Matthew Brost,
Thomas Hellström, Oleksandr Andrushchenko, Helge Deller,
Kees Cook, Jaroslav Kysela, Takashi Iwai, Boris Brezillon,
Steven Price, Liviu Dudau
Cc: Lorenzo Stoakes, linux-mm, linux-kernel, linux-mips, linux-aio,
linux-fsdevel, linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-sound
In-Reply-To: <20260711-b4-vma-flags-mm-v2-0-0fa2357d5431@kernel.org>
Currently mm->def_flags (of type vm_flags_t) is union'd with
mm->def_vma_flags (of type vma_flags_t).
As part of the effort to convert vm_flags_t usage to vma_flags_t (in order
to no longer be arbitrarily limited to a system word size for VMA flags),
prefer mm->def_vma_flags to mm->def_flags throughout the mm logic.
We update dump_mm() to use the %*pb format which means we make no
assumption about the number of VMA flag bits on output when outputting
default VMA flags.
No functional change intended.
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
---
mm/debug.c | 5 +++--
mm/mlock.c | 13 +++++++------
mm/mmap.c | 11 ++++++-----
mm/vma.c | 2 +-
4 files changed, 17 insertions(+), 14 deletions(-)
diff --git a/mm/debug.c b/mm/debug.c
index 497654b36f1a..9a0297b3988d 100644
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -197,7 +197,7 @@ void dump_mm(const struct mm_struct *mm)
"numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
#endif
"tlb_flush_pending %d\n"
- "def_flags: %#lx(%pGv)\n",
+ "def_flags: %*pb(%pGv)\n",
mm, mm->task_size,
mm->mmap_base, mm->mmap_legacy_base,
@@ -226,7 +226,8 @@ void dump_mm(const struct mm_struct *mm)
mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
#endif
atomic_read(&mm->tlb_flush_pending),
- mm->def_flags, &mm->def_flags
+ NUM_VMA_FLAG_BITS, mm->def_vma_flags.__vma_flags,
+ &mm->def_vma_flags
);
}
EXPORT_SYMBOL(dump_mm);
diff --git a/mm/mlock.c b/mm/mlock.c
index 97e49038d8d3..34ffa954006f 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -699,26 +699,27 @@ SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len)
/*
* Take the MCL_* flags passed into mlockall (or 0 if called from munlockall)
- * and translate into the appropriate modifications to mm->def_flags and/or the
- * flags for all current VMAs.
+ * and translate into the appropriate modifications to mm->def_vma_flags and/or
+ * the flags for all current VMAs.
*
* There are a couple of subtleties with this. If mlockall() is called multiple
* times with different flags, the values do not necessarily stack. If mlockall
* is called once including the MCL_FUTURE flag and then a second time without
- * it, VM_LOCKED and VM_LOCKONFAULT will be cleared from mm->def_flags.
+ * it, VM_LOCKED and VM_LOCKONFAULT will be cleared from mm->def_vma_flags.
*/
static int apply_mlockall_flags(int flags)
{
VMA_ITERATOR(vmi, current->mm, 0);
+ struct mm_struct *mm = current->mm;
struct vm_area_struct *vma, *prev = NULL;
vm_flags_t to_add = 0;
- current->mm->def_flags &= ~VM_LOCKED_MASK;
+ vma_flags_clear_mask(&mm->def_vma_flags, VMA_LOCKED_MASK);
if (flags & MCL_FUTURE) {
- current->mm->def_flags |= VM_LOCKED;
+ vma_flags_set(&mm->def_vma_flags, VMA_LOCKED_BIT);
if (flags & MCL_ONFAULT)
- current->mm->def_flags |= VM_LOCKONFAULT;
+ vma_flags_set(&mm->def_vma_flags, VMA_LOCKONFAULT_BIT);
if (!(flags & MCL_CURRENT))
goto out;
diff --git a/mm/mmap.c b/mm/mmap.c
index 39d33f3a55c2..ae9a5018e20e 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -102,15 +102,16 @@ void vma_set_page_prot(struct vm_area_struct *vma)
*/
static int check_brk_limits(unsigned long addr, unsigned long len)
{
+ const struct mm_struct *mm = current->mm;
+ const bool is_def_locked =
+ vma_flags_test(&mm->def_vma_flags, VMA_LOCKED_BIT);
unsigned long mapped_addr;
mapped_addr = get_unmapped_area(NULL, addr, len, 0, MAP_FIXED);
if (IS_ERR_VALUE(mapped_addr))
return mapped_addr;
- return mlock_future_ok(current->mm,
- current->mm->def_flags & VM_LOCKED, len)
- ? 0 : -EAGAIN;
+ return mlock_future_ok(mm, is_def_locked, len) ? 0 : -EAGAIN;
}
SYSCALL_DEFINE1(brk, unsigned long, brk)
@@ -197,7 +198,7 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
goto out;
mm->brk = brk;
- if (mm->def_flags & VM_LOCKED)
+ if (vma_flags_test(&mm->def_vma_flags, VMA_LOCKED_BIT))
populate = true;
success:
@@ -1247,7 +1248,7 @@ int vm_brk_flags(unsigned long addr, unsigned long request, bool is_exec)
vma = vma_prev(&vmi);
ret = do_brk_flags(&vmi, vma, addr, len, vma_flags);
- populate = ((mm->def_flags & VM_LOCKED) != 0);
+ populate = vma_flags_test(&mm->def_vma_flags, VMA_LOCKED_BIT);
mmap_write_unlock(mm);
userfaultfd_unmap_complete(mm, &uf);
if (populate && !ret)
diff --git a/mm/vma.c b/mm/vma.c
index 70b08c76ea2f..1f443d979a7d 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -3426,7 +3426,7 @@ struct vm_area_struct *__install_special_mapping(
if (unlikely(vma == NULL))
return ERR_PTR(-ENOMEM);
- vm_flags |= mm->def_flags | VM_DONTEXPAND;
+ vm_flags |= vma_flags_to_legacy(mm->def_vma_flags) | VM_DONTEXPAND;
if (pgtable_supports_soft_dirty())
vm_flags |= VM_SOFTDIRTY;
vm_flags_init(vma, vm_flags & ~VM_LOCKED_MASK);
--
2.55.0
^ permalink raw reply related
* [PATCH v2 04/13] mm: update generic_get_unmapped_area[_topdown]() to use vma_flags_t
From: Lorenzo Stoakes @ 2026-07-11 18:45 UTC (permalink / raw)
To: Andrew Morton, David Hildenbrand, Liam R. Howlett,
Vlastimil Babka, Mike Rapoport, Suren Baghdasaryan, Michal Hocko,
Thomas Bogendoerfer, Benjamin LaHaise, Alexander Viro,
Christian Brauner, Jan Kara, Hugh Dickins, Baolin Wang, Jann Horn,
Pedro Falcato, Muchun Song, Oscar Salvador, Zi Yan, Nico Pache,
Ryan Roberts, Dev Jain, Barry Song, Lance Yang, Usama Arif,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Simona Vetter, Lucas Stach,
Russell King, Christian Gmeiner, Inki Dae, Seung-Woo Kim,
Kyungmin Park, Krzysztof Kozlowski, Peter Griffin, Alim Akhtar,
Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
Rob Clark, Dmitry Baryshkov, Abhinav Kumar, Jessica Zhang,
Sean Paul, Marijn Suijten, Lyude Paul, Danilo Krummrich,
Tomi Valkeinen, Sandy Huang, Heiko Stübner, Andy Yan,
Thierry Reding, Mikko Perttunen, Jonathan Hunter, Gerd Hoffmann,
Dmitry Osipenko, Gurchetan Singh, Chia-I Wu, Zack Rusin,
Broadcom internal kernel review list, Matthew Brost,
Thomas Hellström, Oleksandr Andrushchenko, Helge Deller,
Kees Cook, Jaroslav Kysela, Takashi Iwai, Boris Brezillon,
Steven Price, Liviu Dudau
Cc: Lorenzo Stoakes, linux-mm, linux-kernel, linux-mips, linux-aio,
linux-fsdevel, linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-sound
In-Reply-To: <20260711-b4-vma-flags-mm-v2-0-0fa2357d5431@kernel.org>
As part of the changes converting VMA flags from a system word size to a
bitmap, extend this change to generic_get_unmapped_area() and
generic_get_unmapped_area_topdown(), which also allows us to convert
stack_guard_placement() as well.
We retain arch_get_unmapped_area() and arch_get_unmapped_area_topdown()
as-is for now, using legacy_to_vma_flags() as necessary to do so.
No functional change intended.
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
---
arch/powerpc/mm/book3s64/slice.c | 6 ++++--
include/linux/sched/mm.h | 4 ++--
mm/mmap.c | 16 ++++++++--------
3 files changed, 14 insertions(+), 12 deletions(-)
diff --git a/arch/powerpc/mm/book3s64/slice.c b/arch/powerpc/mm/book3s64/slice.c
index 28bec5bc7879..82127e31dca6 100644
--- a/arch/powerpc/mm/book3s64/slice.c
+++ b/arch/powerpc/mm/book3s64/slice.c
@@ -659,7 +659,8 @@ unsigned long arch_get_unmapped_area(struct file *filp,
unsigned int psize;
if (radix_enabled())
- return generic_get_unmapped_area(filp, addr, len, pgoff, flags, vm_flags);
+ return generic_get_unmapped_area(filp, addr, len, pgoff, flags,
+ legacy_to_vma_flags(vm_flags));
if (filp && is_file_hugepages(filp))
psize = file_to_psize(filp);
@@ -679,7 +680,8 @@ unsigned long arch_get_unmapped_area_topdown(struct file *filp,
unsigned int psize;
if (radix_enabled())
- return generic_get_unmapped_area_topdown(filp, addr0, len, pgoff, flags, vm_flags);
+ return generic_get_unmapped_area_topdown(filp, addr0, len,
+ pgoff, flags, legacy_to_vma_flags(vm_flags));
if (filp && is_file_hugepages(filp))
psize = file_to_psize(filp);
diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
index 10d723bee95c..10be8a54b416 100644
--- a/include/linux/sched/mm.h
+++ b/include/linux/sched/mm.h
@@ -200,11 +200,11 @@ unsigned long mm_get_unmapped_area_vmaflags(struct file *filp,
unsigned long
generic_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff,
- unsigned long flags, vm_flags_t vm_flags);
+ unsigned long flags, vma_flags_t vma_flags);
unsigned long
generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff,
- unsigned long flags, vm_flags_t vm_flags);
+ unsigned long flags, vma_flags_t vma_flags);
#else
static inline void arch_pick_mmap_layout(struct mm_struct *mm,
const struct rlimit *rlim_stack) {}
diff --git a/mm/mmap.c b/mm/mmap.c
index 4a88b2a233f7..39d33f3a55c2 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -657,9 +657,9 @@ SYSCALL_DEFINE1(old_mmap, struct mmap_arg_struct __user *, arg)
* Determine if the allocation needs to ensure that there is no
* existing mapping within it's guard gaps, for use as start_gap.
*/
-static inline unsigned long stack_guard_placement(vm_flags_t vm_flags)
+static inline unsigned long stack_guard_placement(vma_flags_t vma_flags)
{
- if (vm_flags & VM_SHADOW_STACK)
+ if (vma_flags_test_single_mask(&vma_flags, VMA_SHADOW_STACK))
return PAGE_SIZE;
return 0;
@@ -701,7 +701,7 @@ unsigned long vm_unmapped_area(struct vm_unmapped_area_info *info)
unsigned long
generic_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff,
- unsigned long flags, vm_flags_t vm_flags)
+ unsigned long flags, vma_flags_t vma_flags)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma, *prev;
@@ -726,7 +726,7 @@ generic_get_unmapped_area(struct file *filp, unsigned long addr,
info.length = len;
info.low_limit = mm->mmap_base;
info.high_limit = mmap_end;
- info.start_gap = stack_guard_placement(vm_flags);
+ info.start_gap = stack_guard_placement(vma_flags);
if (filp && is_file_hugepages(filp))
info.align_mask = huge_page_mask_align(filp);
return vm_unmapped_area(&info);
@@ -739,7 +739,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long flags, vm_flags_t vm_flags)
{
return generic_get_unmapped_area(filp, addr, len, pgoff, flags,
- vm_flags);
+ legacy_to_vma_flags(vm_flags));
}
#endif
@@ -750,7 +750,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long
generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff,
- unsigned long flags, vm_flags_t vm_flags)
+ unsigned long flags, vma_flags_t vma_flags)
{
struct vm_area_struct *vma, *prev;
struct mm_struct *mm = current->mm;
@@ -778,7 +778,7 @@ generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
info.length = len;
info.low_limit = PAGE_SIZE;
info.high_limit = arch_get_mmap_base(addr, mm->mmap_base);
- info.start_gap = stack_guard_placement(vm_flags);
+ info.start_gap = stack_guard_placement(vma_flags);
if (filp && is_file_hugepages(filp))
info.align_mask = huge_page_mask_align(filp);
addr = vm_unmapped_area(&info);
@@ -807,7 +807,7 @@ arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
unsigned long flags, vm_flags_t vm_flags)
{
return generic_get_unmapped_area_topdown(filp, addr, len, pgoff, flags,
- vm_flags);
+ legacy_to_vma_flags(vm_flags));
}
#endif
--
2.55.0
^ permalink raw reply related
* [PATCH v2 03/13] mm: convert __get_unmapped_area() to use vma_flags_t
From: Lorenzo Stoakes @ 2026-07-11 18:45 UTC (permalink / raw)
To: Andrew Morton, David Hildenbrand, Liam R. Howlett,
Vlastimil Babka, Mike Rapoport, Suren Baghdasaryan, Michal Hocko,
Thomas Bogendoerfer, Benjamin LaHaise, Alexander Viro,
Christian Brauner, Jan Kara, Hugh Dickins, Baolin Wang, Jann Horn,
Pedro Falcato, Muchun Song, Oscar Salvador, Zi Yan, Nico Pache,
Ryan Roberts, Dev Jain, Barry Song, Lance Yang, Usama Arif,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Simona Vetter, Lucas Stach,
Russell King, Christian Gmeiner, Inki Dae, Seung-Woo Kim,
Kyungmin Park, Krzysztof Kozlowski, Peter Griffin, Alim Akhtar,
Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
Rob Clark, Dmitry Baryshkov, Abhinav Kumar, Jessica Zhang,
Sean Paul, Marijn Suijten, Lyude Paul, Danilo Krummrich,
Tomi Valkeinen, Sandy Huang, Heiko Stübner, Andy Yan,
Thierry Reding, Mikko Perttunen, Jonathan Hunter, Gerd Hoffmann,
Dmitry Osipenko, Gurchetan Singh, Chia-I Wu, Zack Rusin,
Broadcom internal kernel review list, Matthew Brost,
Thomas Hellström, Oleksandr Andrushchenko, Helge Deller,
Kees Cook, Jaroslav Kysela, Takashi Iwai, Boris Brezillon,
Steven Price, Liviu Dudau
Cc: Lorenzo Stoakes, linux-mm, linux-kernel, linux-mips, linux-aio,
linux-fsdevel, linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-sound
In-Reply-To: <20260711-b4-vma-flags-mm-v2-0-0fa2357d5431@kernel.org>
Update __get_unmapped_area() to be parameterised by vma_flags_t rather than
vm_flags_t as part of the effort to move VMA flags from a system word to a
bitmap.
We cascade the changes up to arch_get_unmapped_area_topdown() and
arch_get_unmapped_area(), where, for now, we use vma_flags_to_legacy() in
order to propagate the VMA flags.
No functional change intended.
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
---
fs/hugetlbfs/inode.c | 3 ++-
include/linux/huge_mm.h | 10 +++++-----
include/linux/mm.h | 6 ++++--
include/linux/sched/mm.h | 9 +++------
mm/huge_memory.c | 21 ++++++++++++---------
mm/mmap.c | 27 ++++++++++++++-------------
6 files changed, 40 insertions(+), 36 deletions(-)
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 9fddd1e0b813..43066f9ddf52 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -184,7 +184,8 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
if (addr)
addr0 = ALIGN(addr, huge_page_size(h));
- return mm_get_unmapped_area_vmflags(file, addr0, len, pgoff, flags, 0);
+ return mm_get_unmapped_area_vmaflags(file, addr0, len, pgoff, flags,
+ EMPTY_VMA_FLAGS);
}
/*
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index cae97c307280..9e43e138c0b7 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -391,9 +391,9 @@ static inline bool thp_disabled_by_hw(void)
unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff, unsigned long flags);
-unsigned long thp_get_unmapped_area_vmflags(struct file *filp, unsigned long addr,
+unsigned long thp_get_unmapped_area_vmaflags(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff, unsigned long flags,
- vm_flags_t vm_flags);
+ vma_flags_t vma_flags);
enum split_type {
SPLIT_TYPE_UNIFORM,
@@ -617,9 +617,9 @@ static inline unsigned long thp_vma_allowable_orders(struct vm_area_struct *vma,
#define thp_get_unmapped_area NULL
static inline unsigned long
-thp_get_unmapped_area_vmflags(struct file *filp, unsigned long addr,
- unsigned long len, unsigned long pgoff,
- unsigned long flags, vm_flags_t vm_flags)
+thp_get_unmapped_area_vmaflags(struct file *filp, unsigned long addr,
+ unsigned long len, unsigned long pgoff,
+ unsigned long flags, vma_flags_t vma_flags)
{
return 0;
}
diff --git a/include/linux/mm.h b/include/linux/mm.h
index d20aa2f80472..5b3825fddf58 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -4191,13 +4191,15 @@ unsigned long randomize_page(unsigned long start, unsigned long range);
unsigned long
__get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
- unsigned long pgoff, unsigned long flags, vm_flags_t vm_flags);
+ unsigned long pgoff, unsigned long flags,
+ vma_flags_t vma_flags);
static inline unsigned long
get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
unsigned long pgoff, unsigned long flags)
{
- return __get_unmapped_area(file, addr, len, pgoff, flags, 0);
+ return __get_unmapped_area(file, addr, len, pgoff, flags,
+ EMPTY_VMA_FLAGS);
}
unsigned long do_mmap(struct file *file, unsigned long addr,
diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
index 95d0040df584..10d723bee95c 100644
--- a/include/linux/sched/mm.h
+++ b/include/linux/sched/mm.h
@@ -193,12 +193,9 @@ unsigned long mm_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff,
unsigned long flags);
-unsigned long mm_get_unmapped_area_vmflags(struct file *filp,
- unsigned long addr,
- unsigned long len,
- unsigned long pgoff,
- unsigned long flags,
- vm_flags_t vm_flags);
+unsigned long mm_get_unmapped_area_vmaflags(struct file *filp,
+ unsigned long addr, unsigned long len, unsigned long pgoff,
+ unsigned long flags, vma_flags_t vma_flags);
unsigned long
generic_get_unmapped_area(struct file *filp, unsigned long addr,
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 0dc6d630570f..40d6b4078e3d 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1196,7 +1196,7 @@ static inline bool is_transparent_hugepage(const struct folio *folio)
static unsigned long __thp_get_unmapped_area(struct file *filp,
unsigned long addr, unsigned long len,
loff_t off, unsigned long flags, unsigned long size,
- vm_flags_t vm_flags)
+ vma_flags_t vma_flags)
{
loff_t off_end = off + len;
loff_t off_align = round_up(off, size);
@@ -1212,8 +1212,9 @@ static unsigned long __thp_get_unmapped_area(struct file *filp,
if (len_pad < len || (off + len_pad) < off)
return 0;
- ret = mm_get_unmapped_area_vmflags(filp, addr, len_pad,
- off >> PAGE_SHIFT, flags, vm_flags);
+ ret = mm_get_unmapped_area_vmaflags(filp, addr, len_pad,
+ off >> PAGE_SHIFT, flags,
+ vma_flags);
/*
* The failure might be due to length padding. The caller will retry
@@ -1238,25 +1239,27 @@ static unsigned long __thp_get_unmapped_area(struct file *filp,
return ret;
}
-unsigned long thp_get_unmapped_area_vmflags(struct file *filp, unsigned long addr,
+unsigned long thp_get_unmapped_area_vmaflags(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff, unsigned long flags,
- vm_flags_t vm_flags)
+ vma_flags_t vma_flags)
{
unsigned long ret;
loff_t off = (loff_t)pgoff << PAGE_SHIFT;
- ret = __thp_get_unmapped_area(filp, addr, len, off, flags, PMD_SIZE, vm_flags);
+ ret = __thp_get_unmapped_area(filp, addr, len, off, flags, PMD_SIZE,
+ vma_flags);
if (ret)
return ret;
- return mm_get_unmapped_area_vmflags(filp, addr, len, pgoff, flags,
- vm_flags);
+ return mm_get_unmapped_area_vmaflags(filp, addr, len, pgoff, flags,
+ vma_flags);
}
unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff, unsigned long flags)
{
- return thp_get_unmapped_area_vmflags(filp, addr, len, pgoff, flags, 0);
+ return thp_get_unmapped_area_vmaflags(filp, addr, len, pgoff, flags,
+ EMPTY_VMA_FLAGS);
}
EXPORT_SYMBOL_GPL(thp_get_unmapped_area);
diff --git a/mm/mmap.c b/mm/mmap.c
index bcc3793e532d..4a88b2a233f7 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -411,8 +411,7 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
/* Obtain the address to map to. we verify (or select) it and ensure
* that it represents a valid section of the address space.
*/
- addr = __get_unmapped_area(file, addr, len, pgoff, flags,
- vma_flags_to_legacy(vma_flags));
+ addr = __get_unmapped_area(file, addr, len, pgoff, flags, vma_flags);
if (IS_ERR_VALUE(addr))
return addr;
@@ -812,19 +811,20 @@ arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
}
#endif
-unsigned long mm_get_unmapped_area_vmflags(struct file *filp, unsigned long addr,
- unsigned long len, unsigned long pgoff,
- unsigned long flags, vm_flags_t vm_flags)
+unsigned long mm_get_unmapped_area_vmaflags(struct file *filp, unsigned long addr,
+ unsigned long len, unsigned long pgoff, unsigned long flags,
+ vma_flags_t vma_flags)
{
if (mm_flags_test(MMF_TOPDOWN, current->mm))
return arch_get_unmapped_area_topdown(filp, addr, len, pgoff,
- flags, vm_flags);
- return arch_get_unmapped_area(filp, addr, len, pgoff, flags, vm_flags);
+ flags, vma_flags_to_legacy(vma_flags));
+ return arch_get_unmapped_area(filp, addr, len, pgoff, flags,
+ vma_flags_to_legacy(vma_flags));
}
unsigned long
__get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
- unsigned long pgoff, unsigned long flags, vm_flags_t vm_flags)
+ unsigned long pgoff, unsigned long flags, vma_flags_t vma_flags)
{
unsigned long (*get_area)(struct file *, unsigned long,
unsigned long, unsigned long, unsigned long)
@@ -859,11 +859,11 @@ __get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
&& !addr /* no hint */
&& IS_ALIGNED(len, PMD_SIZE)) {
/* Ensures that larger anonymous mappings are THP aligned. */
- addr = thp_get_unmapped_area_vmflags(file, addr, len,
- pgoff, flags, vm_flags);
+ addr = thp_get_unmapped_area_vmaflags(file, addr, len,
+ pgoff, flags, vma_flags);
} else {
- addr = mm_get_unmapped_area_vmflags(file, addr, len,
- pgoff, flags, vm_flags);
+ addr = mm_get_unmapped_area_vmaflags(file, addr, len,
+ pgoff, flags, vma_flags);
}
if (IS_ERR_VALUE(addr))
return addr;
@@ -881,7 +881,8 @@ unsigned long
mm_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
unsigned long pgoff, unsigned long flags)
{
- return mm_get_unmapped_area_vmflags(file, addr, len, pgoff, flags, 0);
+ return mm_get_unmapped_area_vmaflags(file, addr, len, pgoff, flags,
+ EMPTY_VMA_FLAGS);
}
EXPORT_SYMBOL(mm_get_unmapped_area);
--
2.55.0
^ permalink raw reply related
* [PATCH v2 02/13] mm/vma: update do_mmap() to use vma_flags_t
From: Lorenzo Stoakes @ 2026-07-11 18:44 UTC (permalink / raw)
To: Andrew Morton, David Hildenbrand, Liam R. Howlett,
Vlastimil Babka, Mike Rapoport, Suren Baghdasaryan, Michal Hocko,
Thomas Bogendoerfer, Benjamin LaHaise, Alexander Viro,
Christian Brauner, Jan Kara, Hugh Dickins, Baolin Wang, Jann Horn,
Pedro Falcato, Muchun Song, Oscar Salvador, Zi Yan, Nico Pache,
Ryan Roberts, Dev Jain, Barry Song, Lance Yang, Usama Arif,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Simona Vetter, Lucas Stach,
Russell King, Christian Gmeiner, Inki Dae, Seung-Woo Kim,
Kyungmin Park, Krzysztof Kozlowski, Peter Griffin, Alim Akhtar,
Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
Rob Clark, Dmitry Baryshkov, Abhinav Kumar, Jessica Zhang,
Sean Paul, Marijn Suijten, Lyude Paul, Danilo Krummrich,
Tomi Valkeinen, Sandy Huang, Heiko Stübner, Andy Yan,
Thierry Reding, Mikko Perttunen, Jonathan Hunter, Gerd Hoffmann,
Dmitry Osipenko, Gurchetan Singh, Chia-I Wu, Zack Rusin,
Broadcom internal kernel review list, Matthew Brost,
Thomas Hellström, Oleksandr Andrushchenko, Helge Deller,
Kees Cook, Jaroslav Kysela, Takashi Iwai, Boris Brezillon,
Steven Price, Liviu Dudau
Cc: Lorenzo Stoakes, linux-mm, linux-kernel, linux-mips, linux-aio,
linux-fsdevel, linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-sound
In-Reply-To: <20260711-b4-vma-flags-mm-v2-0-0fa2357d5431@kernel.org>
The core do_mmap() function accepts a vm_flags_t parameter which it then
manipulates before passing to mmap_region() to do the heavy lifting of the
memory mapping.
Update do_mmap() to instead accept a vma_flags_t parameter, and adjust all
the logic within do_mmap() to manipulate this instead.
This is as part of the ongoing effort to convert VMA flags from a system
word size to a bitmap type which allows us to unrestrict the number of VMA
flags, as well as gain control over how VMA flag manipulation occurs.
We do not cascade these changes to all functions which accept vm_flags_t,
but rather use vma_flags_to_legacy() where necessary, specifically
deferring converting calc_vm_prot_bits(), calc_vm_flag_bits() and
__get_unmapped_area() to vma_flags_t.
Also utilise the new vma_flags_can_grow() predicate which correctly handles
the case of architectures without upward growing stacks.
As part of this change, introduce VMA_SHADOW_STACK so we can correctly
handle the case of the shadow stack not being defined.
No functional change intended.
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
---
arch/mips/kernel/vdso.c | 4 +--
fs/aio.c | 2 +-
include/linux/memfd.h | 6 ++---
include/linux/mm.h | 6 +++--
ipc/shm.c | 3 ++-
mm/memfd.c | 15 +++++------
mm/mmap.c | 67 +++++++++++++++++++++++++++++--------------------
mm/nommu.c | 3 ++-
mm/util.c | 10 ++++----
mm/vma.c | 7 +++---
mm/vma.h | 2 +-
11 files changed, 69 insertions(+), 56 deletions(-)
diff --git a/arch/mips/kernel/vdso.c b/arch/mips/kernel/vdso.c
index bd1fc17d3975..94873775fc0f 100644
--- a/arch/mips/kernel/vdso.c
+++ b/arch/mips/kernel/vdso.c
@@ -91,8 +91,8 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
/* Map delay slot emulation page */
base = do_mmap(NULL, STACK_TOP, PAGE_SIZE, PROT_READ | PROT_EXEC,
- MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, 0, 0, &unused,
- NULL);
+ MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED,
+ EMPTY_VMA_FLAGS, 0, &unused, NULL);
if (IS_ERR_VALUE(base)) {
ret = base;
goto out;
diff --git a/fs/aio.c b/fs/aio.c
index f57fa21a2503..3de586da197b 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -604,7 +604,7 @@ static int aio_setup_ring(struct kioctx *ctx, unsigned int nr_events)
ctx->mmap_base = do_mmap(ctx->aio_ring_file, 0, ctx->mmap_size,
PROT_READ | PROT_WRITE,
- MAP_SHARED, 0, 0, &unused, NULL);
+ MAP_SHARED, EMPTY_VMA_FLAGS, 0, &unused, NULL);
mmap_write_unlock(mm);
if (IS_ERR((void *)ctx->mmap_base)) {
ctx->mmap_size = 0;
diff --git a/include/linux/memfd.h b/include/linux/memfd.h
index b4fda09dab9f..c159e40e3f34 100644
--- a/include/linux/memfd.h
+++ b/include/linux/memfd.h
@@ -14,9 +14,9 @@ struct folio *memfd_alloc_folio(struct file *memfd, pgoff_t idx);
* to sealing, or 0 otherwise.
*
* We also update VMA flags if appropriate by manipulating the VMA flags pointed
- * to by vm_flags_ptr.
+ * to by vma_flags_ptr.
*/
-int memfd_check_seals_mmap(struct file *file, vm_flags_t *vm_flags_ptr);
+int memfd_check_seals_mmap(struct file *file, vma_flags_t *vma_flags_ptr);
struct file *memfd_alloc_file(const char *name, unsigned int flags);
int memfd_get_seals(struct file *file);
int memfd_add_seals(struct file *file, unsigned int seals);
@@ -30,7 +30,7 @@ static inline struct folio *memfd_alloc_folio(struct file *memfd, pgoff_t idx)
return ERR_PTR(-EINVAL);
}
static inline int memfd_check_seals_mmap(struct file *file,
- vm_flags_t *vm_flags_ptr)
+ vma_flags_t *vma_flags_ptr)
{
return 0;
}
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7a7f559b3df0..d20aa2f80472 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -465,9 +465,11 @@ enum {
#if defined(CONFIG_X86_USER_SHADOW_STACK) || defined(CONFIG_ARM64_GCS) || \
defined(CONFIG_RISCV_USER_CFI)
#define VM_SHADOW_STACK INIT_VM_FLAG(SHADOW_STACK)
+#define VMA_SHADOW_STACK mk_vma_flags(VMA_SHADOW_STACK_BIT)
#define VMA_STARTGAP_FLAGS mk_vma_flags(VMA_GROWSDOWN_BIT, VMA_SHADOW_STACK_BIT)
#else
#define VM_SHADOW_STACK VM_NONE
+#define VMA_SHADOW_STACK EMPTY_VMA_FLAGS
#define VMA_STARTGAP_FLAGS mk_vma_flags(VMA_GROWSDOWN_BIT)
#endif
#if defined(CONFIG_PPC64)
@@ -4198,9 +4200,9 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
return __get_unmapped_area(file, addr, len, pgoff, flags, 0);
}
-extern unsigned long do_mmap(struct file *file, unsigned long addr,
+unsigned long do_mmap(struct file *file, unsigned long addr,
unsigned long len, unsigned long prot, unsigned long flags,
- vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate,
+ vma_flags_t vma_flags, unsigned long pgoff, unsigned long *populate,
struct list_head *uf);
extern int do_vmi_munmap(struct vma_iterator *vmi, struct mm_struct *mm,
unsigned long start, size_t len, struct list_head *uf,
diff --git a/ipc/shm.c b/ipc/shm.c
index b3e8a58e177d..bb1a721a3e74 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -1661,7 +1661,8 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg,
goto invalid;
}
- addr = do_mmap(file, addr, size, prot, flags, 0, 0, &populate, NULL);
+ addr = do_mmap(file, addr, size, prot, flags, EMPTY_VMA_FLAGS, 0,
+ &populate, NULL);
*raddr = addr;
err = 0;
if (IS_ERR_VALUE(addr))
diff --git a/mm/memfd.c b/mm/memfd.c
index 6c72fe6caef7..c708d92533f4 100644
--- a/mm/memfd.c
+++ b/mm/memfd.c
@@ -370,39 +370,36 @@ static inline bool is_write_sealed(unsigned int seals)
return seals & (F_SEAL_WRITE | F_SEAL_FUTURE_WRITE);
}
-static int check_write_seal(vm_flags_t *vm_flags_ptr)
+static int check_write_seal(vma_flags_t *vma_flags_ptr)
{
- vm_flags_t vm_flags = *vm_flags_ptr;
- vm_flags_t mask = vm_flags & (VM_SHARED | VM_WRITE);
-
/* If a private mapping then writability is irrelevant. */
- if (!(mask & VM_SHARED))
+ if (!vma_flags_test(vma_flags_ptr, VMA_SHARED_BIT))
return 0;
/*
* New PROT_WRITE and MAP_SHARED mmaps are not allowed when
* write seals are active.
*/
- if (mask & VM_WRITE)
+ if (vma_flags_test(vma_flags_ptr, VMA_WRITE_BIT))
return -EPERM;
/*
* This is a read-only mapping, disallow mprotect() from making a
* write-sealed mapping writable in future.
*/
- *vm_flags_ptr &= ~VM_MAYWRITE;
+ vma_flags_clear(vma_flags_ptr, VMA_MAYWRITE_BIT);
return 0;
}
-int memfd_check_seals_mmap(struct file *file, vm_flags_t *vm_flags_ptr)
+int memfd_check_seals_mmap(struct file *file, vma_flags_t *vma_flags_ptr)
{
int err = 0;
unsigned int *seals_ptr = memfd_file_seals_ptr(file);
unsigned int seals = seals_ptr ? *seals_ptr : 0;
if (is_write_sealed(seals))
- err = check_write_seal(vm_flags_ptr);
+ err = check_write_seal(vma_flags_ptr);
return err;
}
diff --git a/mm/mmap.c b/mm/mmap.c
index 308a43eabd83..bcc3793e532d 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -280,7 +280,7 @@ static inline bool file_mmap_ok(struct file *file, struct inode *inode,
* do_mmap() - Perform a userland memory mapping into the current process
* address space of length @len with protection bits @prot, mmap flags @flags
* (from which VMA flags will be inferred), and any additional VMA flags to
- * apply @vm_flags. If this is a file-backed mapping then the file is specified
+ * apply @vma_flags. If this is a file-backed mapping then the file is specified
* in @file and page offset into the file via @pgoff.
*
* This function does not perform security checks on the file and assumes, if
@@ -320,7 +320,8 @@ static inline bool file_mmap_ok(struct file *file, struct inode *inode,
* (2) for details.
* @flags: Flags specifying how the mapping should be performed, see mmap (2)
* for details.
- * @vm_flags: VMA flags which should be set by default, or 0 otherwise.
+ * @vma_flags: VMA flags which should be set by default, or EMPTY_VMA_FLAGS
+ * otherwise.
* @pgoff: Page offset into the @file if file-backed, should be 0 otherwise.
* @populate: A pointer to a value which will be set to 0 if no population of
* the range is required, or the number of bytes to populate if it is. Must be
@@ -335,7 +336,7 @@ static inline bool file_mmap_ok(struct file *file, struct inode *inode,
*/
unsigned long do_mmap(struct file *file, unsigned long addr,
unsigned long len, unsigned long prot,
- unsigned long flags, vm_flags_t vm_flags,
+ unsigned long flags, vma_flags_t vma_flags,
unsigned long pgoff, unsigned long *populate,
struct list_head *uf)
{
@@ -399,13 +400,19 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
* to. we assume access permissions have been handled by the open
* of the memory object, so we don't do any here.
*/
- vm_flags |= calc_vm_prot_bits(prot, pkey) | calc_vm_flag_bits(file, flags) |
- mm->def_flags | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
+ vma_flags_set_mask(&vma_flags,
+ legacy_to_vma_flags(calc_vm_prot_bits(prot, pkey)));
+ vma_flags_set_mask(&vma_flags,
+ legacy_to_vma_flags(calc_vm_flag_bits(file, flags)));
+ vma_flags_set_mask(&vma_flags, mm->def_vma_flags);
+ vma_flags_set(&vma_flags, VMA_MAYREAD_BIT, VMA_MAYWRITE_BIT,
+ VMA_MAYEXEC_BIT);
/* Obtain the address to map to. we verify (or select) it and ensure
* that it represents a valid section of the address space.
*/
- addr = __get_unmapped_area(file, addr, len, pgoff, flags, vm_flags);
+ addr = __get_unmapped_area(file, addr, len, pgoff, flags,
+ vma_flags_to_legacy(vma_flags));
if (IS_ERR_VALUE(addr))
return addr;
@@ -418,7 +425,7 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
if (!can_do_mlock())
return -EPERM;
- if (!mlock_future_ok(mm, vm_flags & VM_LOCKED, len))
+ if (!mlock_future_ok(mm, vma_flags_test(&vma_flags, VMA_LOCKED_BIT), len))
return -EAGAIN;
if (file) {
@@ -461,22 +468,23 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
if (IS_APPEND(inode) && (file->f_mode & FMODE_WRITE))
return -EACCES;
- vm_flags |= VM_SHARED | VM_MAYSHARE;
+ vma_flags_set(&vma_flags, VMA_SHARED_BIT, VMA_MAYSHARE_BIT);
if (!(file->f_mode & FMODE_WRITE))
- vm_flags &= ~(VM_MAYWRITE | VM_SHARED);
+ vma_flags_clear(&vma_flags, VMA_MAYWRITE_BIT,
+ VMA_SHARED_BIT);
fallthrough;
case MAP_PRIVATE:
if (!(file->f_mode & FMODE_READ))
return -EACCES;
if (path_noexec(&file->f_path)) {
- if (vm_flags & VM_EXEC)
+ if (vma_flags_test(&vma_flags, VMA_EXEC_BIT))
return -EPERM;
- vm_flags &= ~VM_MAYEXEC;
+ vma_flags_clear(&vma_flags, VMA_MAYEXEC_BIT);
}
if (!can_mmap_file(file))
return -ENODEV;
- if (vm_flags & (VM_GROWSDOWN|VM_GROWSUP))
+ if (vma_flags_can_grow(&vma_flags))
return -EINVAL;
break;
@@ -488,23 +496,27 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
* Check to see if we are violating any seals and update VMA
* flags if necessary to avoid future seal violations.
*/
- err = memfd_check_seals_mmap(file, &vm_flags);
+ err = memfd_check_seals_mmap(file, &vma_flags);
if (err)
return (unsigned long)err;
} else {
switch (flags & MAP_TYPE) {
case MAP_SHARED:
- if (vm_flags & (VM_GROWSDOWN|VM_GROWSUP))
+ if (vma_flags_can_grow(&vma_flags))
return -EINVAL;
/*
* Ignore pgoff.
*/
pgoff = 0;
- vm_flags |= VM_SHARED | VM_MAYSHARE;
+ vma_flags_set(&vma_flags, VMA_SHARED_BIT, VMA_MAYSHARE_BIT);
break;
- case MAP_DROPPABLE:
- if (VM_DROPPABLE == VM_NONE)
+ case MAP_DROPPABLE: {
+ vma_flags_t droppable = VMA_DROPPABLE;
+
+ if (vma_flags_empty(&droppable))
return -EOPNOTSUPP;
+ vma_flags_set_mask(&vma_flags, droppable);
+
/*
* A locked or stack area makes no sense to be droppable.
*
@@ -515,23 +527,24 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
*/
if (flags & (MAP_LOCKED | MAP_HUGETLB))
return -EINVAL;
- if (vm_flags & (VM_GROWSDOWN | VM_GROWSUP))
+ if (vma_flags_can_grow(&vma_flags))
return -EINVAL;
- vm_flags |= VM_DROPPABLE;
-
/*
* If the pages can be dropped, then it doesn't make
* sense to reserve them.
*/
- vm_flags |= VM_NORESERVE;
+ vma_flags_set(&vma_flags, VMA_NORESERVE_BIT);
/*
* Likewise, they're volatile enough that they
* shouldn't survive forks or coredumps.
*/
- vm_flags |= VM_WIPEONFORK | VM_DONTDUMP;
+ vma_flags_set(&vma_flags, VMA_WIPEONFORK_BIT,
+ VMA_DONTDUMP_BIT);
+
fallthrough;
+ }
case MAP_PRIVATE:
/*
* Set pgoff according to addr for anon_vma.
@@ -550,16 +563,16 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
if (flags & MAP_NORESERVE) {
/* We honor MAP_NORESERVE if allowed to overcommit */
if (sysctl_overcommit_memory != OVERCOMMIT_NEVER)
- vm_flags |= VM_NORESERVE;
+ vma_flags_set(&vma_flags, VMA_NORESERVE_BIT);
/* hugetlb applies strict overcommit unless MAP_NORESERVE */
if (file && is_file_hugepages(file))
- vm_flags |= VM_NORESERVE;
+ vma_flags_set(&vma_flags, VMA_NORESERVE_BIT);
}
- addr = mmap_region(file, addr, len, vm_flags, pgoff, uf);
+ addr = mmap_region(file, addr, len, vma_flags, pgoff, uf);
if (!IS_ERR_VALUE(addr) &&
- ((vm_flags & VM_LOCKED) ||
+ (vma_flags_test(&vma_flags, VMA_LOCKED_BIT) ||
(flags & (MAP_POPULATE | MAP_NONBLOCK)) == MAP_POPULATE))
*populate = len;
return addr;
@@ -1191,7 +1204,7 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
}
ret = do_mmap(vma->vm_file, start, size,
- prot, flags, 0, pgoff, &populate, NULL);
+ prot, flags, EMPTY_VMA_FLAGS, pgoff, &populate, NULL);
out:
mmap_write_unlock(mm);
fput(file);
diff --git a/mm/nommu.c b/mm/nommu.c
index adc0b0ca906b..498e01ee40b0 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1014,11 +1014,12 @@ unsigned long do_mmap(struct file *file,
unsigned long len,
unsigned long prot,
unsigned long flags,
- vm_flags_t vm_flags,
+ vma_flags_t vma_flags,
unsigned long pgoff,
unsigned long *populate,
struct list_head *uf)
{
+ vm_flags_t vm_flags = vma_flags_to_legacy(vma_flags);
struct vm_area_struct *vma;
struct vm_region *region;
struct rb_node *rb;
diff --git a/mm/util.c b/mm/util.c
index 5090457542ca..bf0513d1d3d0 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -578,8 +578,8 @@ unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr,
if (!ret) {
if (mmap_write_lock_killable(mm))
return -EINTR;
- ret = do_mmap(file, addr, len, prot, flag, 0, pgoff, &populate,
- &uf);
+ ret = do_mmap(file, addr, len, prot, flag, EMPTY_VMA_FLAGS, pgoff,
+ &populate, &uf);
mmap_write_unlock(mm);
userfaultfd_unmap_complete(mm, &uf);
if (populate)
@@ -627,20 +627,20 @@ EXPORT_SYMBOL(vm_mmap);
unsigned long vm_mmap_shadow_stack(unsigned long addr, unsigned long len,
unsigned long flags)
{
+ vma_flags_t vma_flags = VMA_SHADOW_STACK;
struct mm_struct *mm = current->mm;
unsigned long ret, unused;
- vm_flags_t vm_flags = VM_SHADOW_STACK;
flags |= MAP_ANONYMOUS | MAP_PRIVATE;
if (addr)
flags |= MAP_FIXED_NOREPLACE;
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
- vm_flags |= VM_NOHUGEPAGE;
+ vma_flags_set(&vma_flags, VMA_NOHUGEPAGE_BIT);
mmap_write_lock(mm);
ret = do_mmap(NULL, addr, len, PROT_READ | PROT_WRITE, flags,
- vm_flags, 0, &unused, NULL);
+ vma_flags, 0, &unused, NULL);
mmap_write_unlock(mm);
return ret;
diff --git a/mm/vma.c b/mm/vma.c
index 9d556d33b24b..70b08c76ea2f 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -2883,7 +2883,7 @@ static unsigned long __mmap_region(struct file *file, unsigned long addr,
* file to be mapped, otherwise NULL.
* @addr: The page-aligned address at which to perform the mapping.
* @len: The page-aligned, non-zero, length of the mapping.
- * @vm_flags: The VMA flags which should be applied to the mapping.
+ * @vma_flags: The VMA flags which should be applied to the mapping.
* @pgoff: If @file is specified, the page offset into the file, if not then
* the virtual page offset in memory of the anonymous mapping.
* @uf: Optionally, a pointer to a list head used for tracking userfaultfd unmap
@@ -2893,12 +2893,11 @@ static unsigned long __mmap_region(struct file *file, unsigned long addr,
* been performed.
*/
unsigned long mmap_region(struct file *file, unsigned long addr,
- unsigned long len, vm_flags_t vm_flags,
+ unsigned long len, vma_flags_t vma_flags,
unsigned long pgoff, struct list_head *uf)
{
unsigned long ret;
bool writable_file_mapping = false;
- const vma_flags_t vma_flags = legacy_to_vma_flags(vm_flags);
mmap_assert_write_locked(current->mm);
@@ -2907,7 +2906,7 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
return -EACCES;
/* Allow architectures to sanity-check the vm_flags. */
- if (!arch_validate_flags(vm_flags))
+ if (!arch_validate_flags(vma_flags_to_legacy(vma_flags)))
return -EINVAL;
/* Map writable and ensure this isn't a sealed memfd. */
diff --git a/mm/vma.h b/mm/vma.h
index adb7a0ba1192..4eb85b4a6adc 100644
--- a/mm/vma.h
+++ b/mm/vma.h
@@ -517,7 +517,7 @@ int mm_take_all_locks(struct mm_struct *mm);
void mm_drop_all_locks(struct mm_struct *mm);
unsigned long mmap_region(struct file *file, unsigned long addr,
- unsigned long len, vm_flags_t vm_flags, unsigned long pgoff,
+ unsigned long len, vma_flags_t vma_flags, unsigned long pgoff,
struct list_head *uf);
int do_brk_flags(struct vma_iterator *vmi, struct vm_area_struct *brkvma,
--
2.55.0
^ permalink raw reply related
* [PATCH v2 01/13] mm: introduce vma_flags_can_grow() and vma_can_grow()
From: Lorenzo Stoakes @ 2026-07-11 18:44 UTC (permalink / raw)
To: Andrew Morton, David Hildenbrand, Liam R. Howlett,
Vlastimil Babka, Mike Rapoport, Suren Baghdasaryan, Michal Hocko,
Thomas Bogendoerfer, Benjamin LaHaise, Alexander Viro,
Christian Brauner, Jan Kara, Hugh Dickins, Baolin Wang, Jann Horn,
Pedro Falcato, Muchun Song, Oscar Salvador, Zi Yan, Nico Pache,
Ryan Roberts, Dev Jain, Barry Song, Lance Yang, Usama Arif,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Simona Vetter, Lucas Stach,
Russell King, Christian Gmeiner, Inki Dae, Seung-Woo Kim,
Kyungmin Park, Krzysztof Kozlowski, Peter Griffin, Alim Akhtar,
Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
Rob Clark, Dmitry Baryshkov, Abhinav Kumar, Jessica Zhang,
Sean Paul, Marijn Suijten, Lyude Paul, Danilo Krummrich,
Tomi Valkeinen, Sandy Huang, Heiko Stübner, Andy Yan,
Thierry Reding, Mikko Perttunen, Jonathan Hunter, Gerd Hoffmann,
Dmitry Osipenko, Gurchetan Singh, Chia-I Wu, Zack Rusin,
Broadcom internal kernel review list, Matthew Brost,
Thomas Hellström, Oleksandr Andrushchenko, Helge Deller,
Kees Cook, Jaroslav Kysela, Takashi Iwai, Boris Brezillon,
Steven Price, Liviu Dudau
Cc: Lorenzo Stoakes, linux-mm, linux-kernel, linux-mips, linux-aio,
linux-fsdevel, linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-sound
In-Reply-To: <20260711-b4-vma-flags-mm-v2-0-0fa2357d5431@kernel.org>
These test whether the VMA has stack semantics, i.e. is able to grow
upwards or downwards depending on the architecture.
In order to account for arches which do not support upward-growing stacks,
introduce VMA_GROWSUP whose definition depends on the architecture
supporting it, and use vma_flags_test_single_mask() in vma_flags_can_grow()
to account for this.
No functional change intended.
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
---
include/linux/mm.h | 21 ++++++++++++++++++---
1 file changed, 18 insertions(+), 3 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 32bb723ffbb9..7a7f559b3df0 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -474,6 +474,7 @@ enum {
#define VM_SAO INIT_VM_FLAG(SAO)
#elif defined(CONFIG_PARISC)
#define VM_GROWSUP INIT_VM_FLAG(GROWSUP)
+#define VMA_GROWSUP mk_vma_flags(VMA_GROWSUP_BIT)
#elif defined(CONFIG_SPARC64)
#define VM_SPARC_ADI INIT_VM_FLAG(SPARC_ADI)
#define VM_ARCH_CLEAR INIT_VM_FLAG(ARCH_CLEAR)
@@ -485,6 +486,7 @@ enum {
#endif
#ifndef VM_GROWSUP
#define VM_GROWSUP VM_NONE
+#define VMA_GROWSUP EMPTY_VMA_FLAGS
#endif
#ifdef CONFIG_ARM64_MTE
#define VM_MTE INIT_VM_FLAG(MTE)
@@ -1578,11 +1580,24 @@ static inline bool vma_is_initial_stack(const struct vm_area_struct *vma)
vma->vm_end >= vma->vm_mm->start_stack;
}
-static inline bool vma_is_temporary_stack(const struct vm_area_struct *vma)
+static inline bool vma_flags_can_grow(const vma_flags_t *flags)
{
- int maybe_stack = vma->vm_flags & (VM_GROWSDOWN | VM_GROWSUP);
+ if (vma_flags_test_single_mask(flags, VMA_GROWSUP))
+ return true;
+ if (vma_flags_test(flags, VMA_GROWSDOWN_BIT))
+ return true;
+
+ return false;
+}
- if (!maybe_stack)
+static inline bool vma_can_grow(const struct vm_area_struct *vma)
+{
+ return vma_flags_can_grow(&vma->flags);
+}
+
+static inline bool vma_is_temporary_stack(const struct vm_area_struct *vma)
+{
+ if (!vma_can_grow(vma))
return false;
if ((vma->vm_flags & VM_STACK_INCOMPLETE_SETUP) ==
--
2.55.0
^ permalink raw reply related
* [PATCH v2 00/13] mm: convert more vm_flags_t users to vma_flags_t
From: Lorenzo Stoakes @ 2026-07-11 18:44 UTC (permalink / raw)
To: Andrew Morton, David Hildenbrand, Liam R. Howlett,
Vlastimil Babka, Mike Rapoport, Suren Baghdasaryan, Michal Hocko,
Thomas Bogendoerfer, Benjamin LaHaise, Alexander Viro,
Christian Brauner, Jan Kara, Hugh Dickins, Baolin Wang, Jann Horn,
Pedro Falcato, Muchun Song, Oscar Salvador, Zi Yan, Nico Pache,
Ryan Roberts, Dev Jain, Barry Song, Lance Yang, Usama Arif,
Madhavan Srinivasan, Michael Ellerman, Nicholas Piggin,
Christophe Leroy (CS GROUP), Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Simona Vetter, Lucas Stach,
Russell King, Christian Gmeiner, Inki Dae, Seung-Woo Kim,
Kyungmin Park, Krzysztof Kozlowski, Peter Griffin, Alim Akhtar,
Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Tvrtko Ursulin,
Rob Clark, Dmitry Baryshkov, Abhinav Kumar, Jessica Zhang,
Sean Paul, Marijn Suijten, Lyude Paul, Danilo Krummrich,
Tomi Valkeinen, Sandy Huang, Heiko Stübner, Andy Yan,
Thierry Reding, Mikko Perttunen, Jonathan Hunter, Gerd Hoffmann,
Dmitry Osipenko, Gurchetan Singh, Chia-I Wu, Zack Rusin,
Broadcom internal kernel review list, Matthew Brost,
Thomas Hellström, Oleksandr Andrushchenko, Helge Deller,
Kees Cook, Jaroslav Kysela, Takashi Iwai, Boris Brezillon,
Steven Price, Liviu Dudau
Cc: Lorenzo Stoakes, linux-mm, linux-kernel, linux-mips, linux-aio,
linux-fsdevel, linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-sound, Jani Nikula
This series makes further progress in converting usage of the deprecated
vm_flags_t type to its replacement, vma_flags_t.
It focuses on mm, though updates some users of mm APIs also.
It updates:
* The core do_mmap() code path for VMA mapping.
* Unmapped area logic.
* The usage of mm->def_vma_flags.
* VMA page protection bit logic.
* General usage of VMA flags in core mm code, mlock, mprotect, mremap.
REVIEWER/MERGER NOTE: This is dependent on [0], which must be merged before
this.
[0]:https://lore.kernel.org/linux-mm/20260710-b4-pre-scalable-cow-v2-0-2a5aa403d977@kernel.org/
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
---
Changes in v2:
* Rebased on to mm-new that has the 33 patch rework dependency in it.
* Distributed tags, thanks everybody!
* Moved VMA_STACK_INCOMPLETE_SETUP and VMA_STACK_EARLY VMA userland test defines
from 1/13 to 9/13 as per Zi.
* Fixed whitespace in 3/13 as per Zi.
* Updated 5/13 to use %*pb formatter for VMA flags (to match mm flags formatter)
in dump_mm(), as per Lance.
* Updated 8/13 to update panthor_gem.c to vma_get_page_prot() as per Lance.
* Fixed up comment type in 11/13 as per Lance.
* Fixed bug of using VMA_GROWSUP_BIT rather than VMA_GROWSUP as per Lance
in 12/13.
* Added detail about when we are and are not required to open code
vma_write_lock() for VMA flag mutators in the commit message for 13/13 as
per Lance and Zi.
v1:
https://patch.msgid.link/cover.1782760670.git.ljs@kernel.org
To: Andrew Morton <akpm@linux-foundation.org>
To: David Hildenbrand <david@kernel.org>
To: "Liam R. Howlett" <liam@infradead.org>
To: Vlastimil Babka <vbabka@kernel.org>
To: Mike Rapoport <rppt@kernel.org>
To: Suren Baghdasaryan <surenb@google.com>
To: Michal Hocko <mhocko@suse.com>
To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
To: Benjamin LaHaise <bcrl@kvack.org>
To: Alexander Viro <viro@zeniv.linux.org.uk>
To: Christian Brauner <brauner@kernel.org>
To: Jan Kara <jack@suse.cz>
To: Hugh Dickins <hughd@google.com>
To: Baolin Wang <baolin.wang@linux.alibaba.com>
To: Jann Horn <jannh@google.com>
To: Pedro Falcato <pfalcato@suse.de>
To: Muchun Song <muchun.song@linux.dev>
To: Oscar Salvador <osalvador@suse.de>
To: Zi Yan <ziy@nvidia.com>
To: Nico Pache <npache@redhat.com>
To: Ryan Roberts <ryan.roberts@arm.com>
To: Dev Jain <dev.jain@arm.com>
To: Barry Song <baohua@kernel.org>
To: Lance Yang <lance.yang@linux.dev>
To: Usama Arif <usama.arif@linux.dev>
To: Madhavan Srinivasan <maddy@linux.ibm.com>
To: Michael Ellerman <mpe@ellerman.id.au>
To: Nicholas Piggin <npiggin@gmail.com>
To: "Christophe Leroy (CS GROUP)" <chleroy@kernel.org>
To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
To: Maxime Ripard <mripard@kernel.org>
To: Thomas Zimmermann <tzimmermann@suse.de>
To: David Airlie <airlied@gmail.com>
To: Simona Vetter <simona@ffwll.ch>
To: Lucas Stach <l.stach@pengutronix.de>
To: Russell King <linux+etnaviv@armlinux.org.uk>
To: Christian Gmeiner <christian.gmeiner@gmail.com>
To: Inki Dae <inki.dae@samsung.com>
To: Seung-Woo Kim <sw0312.kim@samsung.com>
To: Kyungmin Park <kyungmin.park@samsung.com>
To: Krzysztof Kozlowski <krzk@kernel.org>
To: Peter Griffin <peter.griffin@linaro.org>
To: Alim Akhtar <alim.akhtar@samsung.com>
To: Jani Nikula <jani.nikula@linux.intel.com>
To: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
To: Rodrigo Vivi <rodrigo.vivi@intel.com>
To: Tvrtko Ursulin <tursulin@ursulin.net>
To: Rob Clark <robin.clark@oss.qualcomm.com>
To: Dmitry Baryshkov <lumag@kernel.org>
To: Abhinav Kumar <abhinav.kumar@linux.dev>
To: Jessica Zhang <jesszhan0024@gmail.com>
To: Sean Paul <sean@poorly.run>
To: Marijn Suijten <marijn.suijten@somainline.org>
To: Lyude Paul <lyude@redhat.com>
To: Danilo Krummrich <dakr@kernel.org>
To: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
To: Sandy Huang <hjc@rock-chips.com>
To: Heiko Stübner <heiko@sntech.de>
To: Andy Yan <andy.yan@rock-chips.com>
To: Thierry Reding <thierry.reding@kernel.org>
To: Mikko Perttunen <mperttunen@nvidia.com>
To: Jonathan Hunter <jonathanh@nvidia.com>
To: Gerd Hoffmann <kraxel@redhat.com>
To: Dmitry Osipenko <dmitry.osipenko@collabora.com>
To: Gurchetan Singh <gurchetansingh@chromium.org>
To: Chia-I Wu <olvaffe@gmail.com>
To: Zack Rusin <zack.rusin@broadcom.com>
To: Broadcom internal kernel review list <bcm-kernel-feedback-list@broadcom.com>
To: Matthew Brost <matthew.brost@intel.com>
To: Thomas Hellström <thomas.hellstrom@linux.intel.com>
To: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
To: Helge Deller <deller@gmx.de>
To: Kees Cook <kees@kernel.org>
To: Jaroslav Kysela <perex@perex.cz>
To: Takashi Iwai <tiwai@suse.com>
To: Boris Brezillon <boris.brezillon@collabora.com>
To: Steven Price <steven.price@arm.com>
To: Liviu Dudau <liviu.dudau@arm.com>
Cc: ljs@kernel.org
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@vger.kernel.org
Cc: linux-aio@kvack.org
Cc: linux-fsdevel@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: dri-devel@lists.freedesktop.org
Cc: etnaviv@lists.freedesktop.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: intel-gfx@lists.freedesktop.org
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org
Cc: nouveau@lists.freedesktop.org
Cc: linux-rockchip@lists.infradead.org
Cc: linux-tegra@vger.kernel.org
Cc: virtualization@lists.linux.dev
Cc: intel-xe@lists.freedesktop.org
Cc: xen-devel@lists.xenproject.org
Cc: linux-fbdev@vger.kernel.org
Cc: linux-sound@vger.kernel.org
---
Lorenzo Stoakes (13):
mm: introduce vma_flags_can_grow() and vma_can_grow()
mm/vma: update do_mmap() to use vma_flags_t
mm: convert __get_unmapped_area() to use vma_flags_t
mm: update generic_get_unmapped_area[_topdown]() to use vma_flags_t
mm: prefer mm->def_vma_flags in mm logic
mm/vma: convert vm_pgprot_modify() to use vma_flags_t and rename
mm/vma: rename vma_get_page_prot to vma_flags_to_page_prot
mm: introduce vma_get_page_prot() and use it
mm/vma: update create_init_stack_vma() to use vma_flags_t
mm/vma: convert miscellaneous uses of VMA flags in core mm
mm/mlock: convert mlock code to use vma_flags_t
mm/mprotect: convert mprotect code to use vma_flags_t
mm/mremap: convert mremap code to use vma_flags_t
arch/mips/kernel/vdso.c | 4 +-
arch/powerpc/mm/book3s64/slice.c | 6 +-
drivers/gpu/drm/drm_gem.c | 2 +-
drivers/gpu/drm/drm_gem_dma_helper.c | 2 +-
drivers/gpu/drm/drm_gem_shmem_helper.c | 2 +-
drivers/gpu/drm/etnaviv/etnaviv_gem.c | 2 +-
drivers/gpu/drm/exynos/exynos_drm_gem.c | 6 +-
drivers/gpu/drm/i915/gem/i915_gem_mman.c | 12 +-
drivers/gpu/drm/msm/msm_gem.c | 2 +-
drivers/gpu/drm/nouveau/nouveau_gem.c | 2 +-
drivers/gpu/drm/omapdrm/omap_fbdev.c | 2 +-
drivers/gpu/drm/omapdrm/omap_gem.c | 6 +-
drivers/gpu/drm/panthor/panthor_gem.c | 2 +-
drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 2 +-
drivers/gpu/drm/tegra/gem.c | 2 +-
drivers/gpu/drm/virtio/virtgpu_vram.c | 2 +-
drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c | 2 +-
drivers/gpu/drm/xe/xe_device.c | 2 +-
drivers/gpu/drm/xe/xe_mmio_gem.c | 2 +-
drivers/gpu/drm/xen/xen_drm_front_gem.c | 2 +-
drivers/video/fbdev/core/fb_io_fops.c | 2 +-
fs/aio.c | 2 +-
fs/hugetlbfs/inode.c | 3 +-
include/linux/huge_mm.h | 10 +-
include/linux/memfd.h | 6 +-
include/linux/mm.h | 52 +++++++--
include/linux/sched/mm.h | 13 +--
ipc/shm.c | 3 +-
mm/debug.c | 5 +-
mm/huge_memory.c | 21 ++--
mm/memfd.c | 15 +--
mm/mlock.c | 99 +++++++++--------
mm/mmap.c | 164 +++++++++++++++-------------
mm/mprotect.c | 16 +--
mm/mremap.c | 38 ++++---
mm/nommu.c | 3 +-
mm/util.c | 10 +-
mm/vma.c | 26 +++--
mm/vma.h | 8 +-
mm/vma_exec.c | 20 ++--
sound/core/memalloc.c | 2 +-
tools/testing/vma/include/dup.h | 23 ++--
42 files changed, 341 insertions(+), 264 deletions(-)
---
base-commit: 61cccb8363fcc282d4ae0555b8739dd227f5ad0b
change-id: 20260711-b4-vma-flags-mm-bd05385df9fc
Cheers,
--
Lorenzo Stoakes <ljs@kernel.org>
^ permalink raw reply
* Re: [PATCH 13/13] mm/mremap: convert mremap code to use vma_flags_t
From: Lorenzo Stoakes @ 2026-07-11 17:09 UTC (permalink / raw)
To: Zi Yan
Cc: Lance Yang, akpm, tsbogend, maddy, mpe, maarten.lankhorst,
mripard, tzimmermann, airlied, simona, l.stach, inki.dae,
sw0312.kim, kyungmin.park, krzk, peter.griffin, jani.nikula,
joonas.lahtinen, rodrigo.vivi, tursulin, robin.clark, lumag,
lyude, dakr, tomi.valkeinen, hjc, heiko, andy.yan, thierry.reding,
mperttunen, jonathanh, kraxel, dmitry.osipenko, zack.rusin,
matthew.brost, thomas.hellstrom, oleksandr_andrushchenko, deller,
bcrl, viro, brauner, muchun.song, osalvador, david, baolin.wang,
liam, npache, ryan.roberts, dev.jain, baohua, hughd, vbabka, rppt,
surenb, mhocko, jannh, pfalcato, kees, perex, tiwai, linux-mips,
linux-kernel, linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-aio, linux-fsdevel, linux-mm, linux-sound
In-Reply-To: <DJTOP760MDDG.2KUSKD8WVVKJ5@nvidia.com>
On Wed, Jul 08, 2026 at 10:28:00PM -0400, Zi Yan wrote:
> On Thu Jul 2, 2026 at 12:07 PM EDT, Lorenzo Stoakes wrote:
> > On Thu, Jul 02, 2026 at 09:49:47PM +0800, Lance Yang wrote:
> >>
> >> On Mon, Jun 29, 2026 at 08:25:36PM +0100, Lorenzo Stoakes wrote:
> >> >Replace use of the legacy vm_flags_t flags with vma_flags_t values
> >> >throughout the mremap logic.
> >> >
> >> >Additionally update comments to reflect the changes to be consistent.
> >> >
> >> >No functional change intended.
> >> >
> >> >Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
> >> >---
> >>
> >> The vm_flags_set() cases below spell out vma_start_write(), but the
> >> vm_flags_clear() cases don't?
> >
> > Yep as I said elsewhere, implicitly taking the lock is terrible and me doing
> > this is completely on purpose to get rid of that :)
> >
> > But I haven't been clear enough clearly, so I should put the argument as to why
> > that's ok in the commit message.
> >
> > Will do so on respin.
>
> How about also add a comment to vma_clear*() telling us a lock is not
> needed and why like you explained a lock is needed for vma_set*()?
> This asymmetry could confuse people.
Well you do absolutely have to hold the lock once the VMA is initialised when
using any VMA flags API that manipulates flags (apart from the explicitly atomic
case).
The argument here is that the VMA was _already locked_ at the point of clearing
:)
>
> This patch looks good to me.
>
> Reviewed-by: Zi Yan <ziy@nvidia.com>
Thanks!
>
> --
> Best Regards,
> Yan, Zi
>
Cheers, Lorenzo
^ permalink raw reply
* Re: [PATCH 12/13] mm/mprotect: convert mprotect code to use vma_flags_t
From: Lorenzo Stoakes @ 2026-07-11 17:04 UTC (permalink / raw)
To: Zi Yan
Cc: Lance Yang, akpm, tsbogend, maddy, mpe, maarten.lankhorst,
mripard, tzimmermann, airlied, simona, l.stach, inki.dae,
sw0312.kim, kyungmin.park, krzk, peter.griffin, jani.nikula,
joonas.lahtinen, rodrigo.vivi, tursulin, robin.clark, lumag,
lyude, dakr, tomi.valkeinen, hjc, heiko, andy.yan, thierry.reding,
mperttunen, jonathanh, kraxel, dmitry.osipenko, zack.rusin,
matthew.brost, thomas.hellstrom, oleksandr_andrushchenko, deller,
bcrl, viro, brauner, muchun.song, osalvador, david, baolin.wang,
liam, npache, ryan.roberts, dev.jain, baohua, hughd, vbabka, rppt,
surenb, mhocko, jannh, pfalcato, kees, perex, tiwai, linux-mips,
linux-kernel, linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-aio, linux-fsdevel, linux-mm, linux-sound
In-Reply-To: <DJTOG7IBZKEE.87TLWNXOCHR8@nvidia.com>
On Wed, Jul 08, 2026 at 10:16:15PM -0400, Zi Yan wrote:
> On Thu Jul 2, 2026 at 11:53 AM EDT, Lorenzo Stoakes wrote:
> > On Thu, Jul 02, 2026 at 12:09:17AM +0800, Lance Yang wrote:
> >>
> >> On Mon, Jun 29, 2026 at 08:25:35PM +0100, Lorenzo Stoakes wrote:
> >> >Replace use of the legacy vm_flags_t flags with vma_flags_t values
> >> >throughout the mprotect logic.
> >> >
> >> >Note that we retain the legacy vm_flags_t bit shifting code in
> >> >do_mprotect_key(), deferring a vma_flags_t approach to this for the time
> >> >being.
> >> >
> >> >Additionally update comments to reflect the changes to be consistent.
> >> >
> >> >No functional change intended.
> >> >
> >> >Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
> >> >---
> >> > mm/mprotect.c | 16 ++++++++--------
> >> > 1 file changed, 8 insertions(+), 8 deletions(-)
> >> >
> >> >diff --git a/mm/mprotect.c b/mm/mprotect.c
> >> >index 9cbf932b028c..c9504b2a2525 100644
> >> >--- a/mm/mprotect.c
> >> >+++ b/mm/mprotect.c
> >> >@@ -40,7 +40,7 @@
> >> >
> >> > static bool maybe_change_pte_writable(struct vm_area_struct *vma, pte_t pte)
> >> > {
> >> >- if (WARN_ON_ONCE(!(vma->vm_flags & VM_WRITE)))
> >> >+ if (WARN_ON_ONCE(!vma_test(vma, VMA_WRITE_BIT)))
> >> > return false;
> >> >
> >> > /* Don't touch entries that are not even readable. */
> >> >@@ -97,7 +97,7 @@ static bool can_change_shared_pte_writable(struct vm_area_struct *vma,
> >> > bool can_change_pte_writable(struct vm_area_struct *vma, unsigned long addr,
> >> > pte_t pte)
> >> > {
> >> >- if (!(vma->vm_flags & VM_SHARED))
> >> >+ if (!vma_test(vma, VMA_SHARED_BIT))
> >> > return can_change_private_pte_writable(vma, addr, pte);
> >> >
> >> > return can_change_shared_pte_writable(vma, pte);
> >> >@@ -194,7 +194,7 @@ static __always_inline void set_write_prot_commit_flush_ptes(struct vm_area_stru
> >> > {
> >> > bool set_write;
> >> >
> >> >- if (vma->vm_flags & VM_SHARED) {
> >> >+ if (vma_test(vma, VMA_SHARED_BIT)) {
> >> > set_write = can_change_shared_pte_writable(vma, ptent);
> >> > prot_commit_flush_ptes(vma, addr, ptep, oldpte, ptent, nr_ptes,
> >> > /* idx = */ 0, set_write, tlb);
> >> >@@ -811,8 +811,8 @@ mprotect_fixup(struct vma_iterator *vmi, struct mmu_gather *tlb,
> >> > vm_unacct_memory(nrpages);
> >> >
> >> > /*
> >> >- * Private VM_LOCKED VMA becoming writable: trigger COW to avoid major
> >> >- * fault on access.
> >> >+ * Private VMA_LOCKED_BIT VMA becoming writable: trigger COW to avoid
> >> >+ * major fault on access.
> >> > */
> >> > if (vma_flags_test(&new_vma_flags, VMA_WRITE_BIT) &&
> >> > vma_flags_test(&old_vma_flags, VMA_LOCKED_BIT) &&
> >> >@@ -886,7 +886,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
> >> > goto out;
> >> > start = vma->vm_start;
> >> > error = -EINVAL;
> >> >- if (!(vma->vm_flags & VM_GROWSDOWN))
> >> >+ if (!vma_test(vma, VMA_GROWSDOWN_BIT))
> >> > goto out;
> >> > } else {
> >> > if (vma->vm_start > start)
> >> >@@ -894,7 +894,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len,
> >> > if (unlikely(grows & PROT_GROWSUP)) {
> >> > end = vma->vm_end;
> >> > error = -EINVAL;
> >> >- if (!(vma->vm_flags & VM_GROWSUP))
> >> >+ if (!vma_test(vma, VMA_GROWSUP_BIT))
> >>
> >> IIUC, should this be
> >>
> >> if (!vma_test_single_mask(vma, VMA_GROWSUP))
> >>
> >> instead?
> >>
> >> #elif defined(CONFIG_PARISC)
> >> #define VM_GROWSUP INIT_VM_FLAG(GROWSUP)
> >> ...
> >> #ifndef VM_GROWSUP
> >> #define VM_GROWSUP VM_NONE
> >> ...
> >>
> >> VM_GROWSUP is only defined as GROWSUP on parisc and becomes VM_NONE
> >> elsewhere. But VMA_GROWSUP_BIT is the raw ARCH_1 bit, which is also used
> >> for other arch-specific VMA flags:
> >>
> >> DECLARE_VMA_BIT_ALIAS(SAO, ARCH_1), /* Strong Access Ordering (powerpc) */
> >> DECLARE_VMA_BIT_ALIAS(GROWSUP, ARCH_1), /* parisc */
> >> DECLARE_VMA_BIT_ALIAS(SPARC_ADI, ARCH_1), /* sparc64 */
> >> DECLARE_VMA_BIT_ALIAS(ARM64_BTI, ARCH_1), /* arm64 */
> >> DECLARE_VMA_BIT_ALIAS(ARCH_CLEAR, ARCH_1), /* sparc64, arm64 */
> >> DECLARE_VMA_BIT_ALIAS(MAPPED_COPY, ARCH_1), /* !CONFIG_MMU */
> >>
> >> Other vma_test() changes look fine to me: just fixed INIT_VM_FLAG()
> >> masks matching their VMA_*_BIT :)
> >
> > Thanks you're right, will fix!
> >
> > Again I swear I ran claude on all of this so it's failing me here :)
> >
>
> Is it better to add something like below to avoid misuse these mutually
> exclusive bit aliases?
>
> An example for VMA_GROWSUP_BIT:
>
> #if defined(CONFIG_PARISC)
> DECLARE_VMA_BIT_ALIAS(GROWSUP, ARCH_1), /* parisc */
> #else
> /* make VMA_GROWSUP_BIT a build bug on */
> #endif
Nah we can't...
>
> Hmm, these VMA_*_BIT are enum items, so the above might not be possible.
...because of this but also this is the canonical definition and we want to use
it for the VMA_xxx form.
> An alternative is to only define them for the corresponding config and
> you will get build errors when trying to use them directly and the
> config is not enabled. Otherwise, misuses like "vma_test(vma,
> VMA_GROWSUP_BIT)" is harder to uncover.
Yeah good idea, I may add a new DECLARE_INTERNAL_VMA_BIT() that gives you
__VMA_xxx_BIT, so nobody makes the obvious mistake and we force uses of safe
VMA_xxx form. Hmm :)
>
>
> --
> Best Regards,
> Yan, Zi
>
Thanks, Lorenzo
^ permalink raw reply
* Re: [PATCH 11/13] mm/mlock: convert mlock code to use vma_flags_t
From: Lorenzo Stoakes @ 2026-07-11 16:52 UTC (permalink / raw)
To: Zi Yan
Cc: Andrew Morton, Thomas Bogendoerfer, Madhavan Srinivasan,
Michael Ellerman, Maarten Lankhorst, Maxime Ripard,
Thomas Zimmermann, David Airlie, Simona Vetter, Lucas Stach,
Inki Dae, Seung-Woo Kim, Kyungmin Park, Krzysztof Kozlowski,
Peter Griffin, Jani Nikula, Joonas Lahtinen, Rodrigo Vivi,
Tvrtko Ursulin, Rob Clark, Dmitry Baryshkov, Lyude Paul,
Danilo Krummrich, Tomi Valkeinen, Sandy Huang, Heiko Stübner,
Andy Yan, Thierry Reding, Mikko Perttunen, Jonathan Hunter,
Gerd Hoffmann, Dmitry Osipenko, Zack Rusin, Matthew Brost,
Thomas Hellstrom, Oleksandr Andrushchenko, Helge Deller,
Benjamin LaHaise, Alexander Viro, Christian Brauner, Muchun Song,
Oscar Salvador, David Hildenbrand, Baolin Wang, Liam R . Howlett,
Nico Pache, Ryan Roberts, Dev Jain, Barry Song, Lance Yang,
Hugh Dickins, Vlastimil Babka, Mike Rapoport, Suren Baghdasaryan,
Michal Hocko, Jann Horn, Pedro Falcato, Kees Cook,
Jaroslav Kysela, Takashi Iwai, linux-mips, linux-kernel,
linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-aio, linux-fsdevel, linux-mm, linux-sound
In-Reply-To: <DJTO4SXFAKEV.1GVVCX3LZ6R0M@nvidia.com>
On Wed, Jul 08, 2026 at 10:01:22PM -0400, Zi Yan wrote:
> On Mon Jun 29, 2026 at 3:25 PM EDT, Lorenzo Stoakes wrote:
> > Replace use of the legacy vm_flags_t flags with vma_flags_t values
> > throughout the mlock logic.
> >
> > Additionally update comments to reflect the changes to be consistent.
> >
> > No functional change intended.
> >
> > Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
> > ---
> > mm/mlock.c | 86 +++++++++++++++++++++++++++++-------------------------
> > 1 file changed, 46 insertions(+), 40 deletions(-)
> >
>
> LGTM. What confused me when I was reading the code is VMA_LOCKED_MASK
> and VMA_LOCKED_BIT, since both share the same prefix VMA_LOCKED. Before
> looking at the definition of VMA_LOCKED_MASK, I was wondering when to
> use _BIT or _MASK. But it is just a naming thing.
Yeah, indeed, not great naming there. Was a pre-existing though, and previously
was VM_LOCKED_MASK (also not great :)
The whole VMA_LOCKED_BIT and VMA_LOCK_ON_FAULT_BIT thing is a bit weird anyway,
since you set both and then just use the latter to know not to fault in in
GUP... anyway, can revisit that one later...! :)
>
> Anyway,
>
> Reviewed-by: Zi Yan <ziy@nvidia.com>
Thanks!
>
>
> --
> Best Regards,
> Yan, Zi
>
Cheers, Lorenzo
^ permalink raw reply
* Re: [PATCH 10/13] mm/vma: convert miscellaneous uses of VMA flags in core mm
From: Lorenzo Stoakes @ 2026-07-11 16:44 UTC (permalink / raw)
To: Zi Yan
Cc: Lance Yang, akpm, tsbogend, maddy, mpe, maarten.lankhorst,
mripard, tzimmermann, airlied, simona, l.stach, inki.dae,
sw0312.kim, kyungmin.park, krzk, peter.griffin, jani.nikula,
joonas.lahtinen, rodrigo.vivi, tursulin, robin.clark, lumag,
lyude, dakr, tomi.valkeinen, hjc, heiko, andy.yan, thierry.reding,
mperttunen, jonathanh, kraxel, dmitry.osipenko, zack.rusin,
matthew.brost, thomas.hellstrom, oleksandr_andrushchenko, deller,
bcrl, viro, brauner, muchun.song, osalvador, david, baolin.wang,
liam, npache, ryan.roberts, dev.jain, baohua, hughd, vbabka, rppt,
surenb, mhocko, jannh, pfalcato, kees, perex, tiwai, linux-mips,
linux-kernel, linuxppc-dev, dri-devel, etnaviv, linux-arm-kernel,
linux-samsung-soc, intel-gfx, linux-arm-msm, freedreno, nouveau,
linux-rockchip, linux-tegra, virtualization, intel-xe, xen-devel,
linux-fbdev, linux-aio, linux-fsdevel, linux-mm, linux-sound
In-Reply-To: <alJqjo_MZCFWj3Wt@lucifer>
On Sat, Jul 11, 2026 at 05:23:39PM +0100, Lorenzo Stoakes wrote:
> On Wed, Jul 08, 2026 at 09:52:19PM -0400, Zi Yan wrote:
> > On Thu Jul 2, 2026 at 11:46 AM EDT, Lorenzo Stoakes wrote:
> > > On Thu, Jul 02, 2026 at 09:12:33PM +0800, Lance Yang wrote:
> > >>
> > >> On Mon, Jun 29, 2026 at 08:25:33PM +0100, Lorenzo Stoakes wrote:
> > >> >Update various uses of legacy flags in vma.c and mmap.c to the new
> > >> >vma_flags_t type, updating comments alongside them to be consistent.
> > >> >
> > >> >Also update __install_special_mapping() to rearrange things slightly to
> > >> >accommodate the changes.
> > >> >
> > >> >Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
> > >> >---
> > >> [...]
> > >> >diff --git a/mm/vma.c b/mm/vma.c
> > >> >index b81c05e67a61..ab2ef0f04420 100644
> > >> >--- a/mm/vma.c
> > >> >+++ b/mm/vma.c
> > >> >@@ -3417,23 +3417,27 @@ struct vm_area_struct *__install_special_mapping(
> > >> > vm_flags_t vm_flags, void *priv,
> > >> > const struct vm_operations_struct *ops)
> > >> > {
> > >> >- int ret;
> > >> >+ vma_flags_t vma_flags = legacy_to_vma_flags(vm_flags);
> > >> > struct vm_area_struct *vma;
> > >> >+ int ret;
> > >> >
> > >> > vma = vm_area_alloc(mm);
> > >> >- if (unlikely(vma == NULL))
> > >> >+ if (unlikely(!vma))
> > >> > return ERR_PTR(-ENOMEM);
> > >> >
> > >> >- vma_set_range(vma, addr, addr + len, 0);
> > >> >- vm_flags |= vma_flags_to_legacy(mm->def_vma_flags) | VM_DONTEXPAND;
> > >> >+ vma_flags_set_mask(&vma_flags, mm->def_vma_flags);
> > >> >+ vma_flags_set(&vma_flags, VMA_DONTEXPAND_BIT);
> > >> > if (pgtable_supports_soft_dirty())
> > >> >- vm_flags |= VM_SOFTDIRTY;
> > >> >- vm_flags_init(vma, vm_flags & ~VM_LOCKED_MASK);
> > >> >+ vma_flags_set(&vma_flags, VMA_SOFTDIRTY_BIT);
> > >> >+ vma_flags_clear_mask(&vma_flags, VMA_LOCKED_MASK);
> > >> >+ vma->flags = vma_flags;
> > >>
> > >> Maybe worth a vma_flags_init() helper here to mirror vm_flags_init()?
> > >> With this open-coded, we lose the soft-dirty WARN_ON_ONCE sanity check.
> > >>
> > >> Might be nicer to keep that check in one place ;)
> > >
> > > I really hate all the VMA flag accessors, they conflate things horribly - we
> > > should be explicitly taking VMA write locks when we need to (and often killable
> > > ones actually) not assuming that a VMA flags accessor does (they should at most
> > > assert).
> > >
> > > This case is even more terribly egregious - you are setting flags at an
> > > arbitrary time, why are we asserting something about softdirty?
> > >
> > > You may update them as part of initialisation, maybe not. It's far from a
> > > guarantee and feels like a lazy place to put it.
> > >
> > > BUT obviously it's an oversight not to open code that here, so I'll update the
> > > patch to do that!
> >
> > What do you want to open code here? softdirty WARN_ON_ONCE()?
>
> As you can tell I said this reflexively without checking the code :)
>
> >
> > vma_flags gets VMA_SOFTDIRTY_BIT just above vma->flags, why do we need a
> > check after that?
>
> And yeah it's completely unnecessary, indeed.
>
> >
> > BTW, if you think the check is needed, patch 9 will need to be updated,
> > since the same pattern appears in create_init_stack_vma().
>
> I'll check to see if it's valid there.
Exactly the same case as here, unnecessary :)
Cheers, LOrenzo
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