* + bpf-explicitly-align-bpf_res_spin_lock.patch added to mm-nonmm-unstable branch
@ 2025-12-27 15:09 Andrew Morton
0 siblings, 0 replies; 3+ messages in thread
From: Andrew Morton @ 2025-12-27 15:09 UTC (permalink / raw)
To: mm-commits, ysato, yonghong.song, will, tglx, stefan.kristiansson,
song, shorne, sdf, sashal, peterz, mingo, martin.lau,
mark.rutland, kpsingh, jonas, jolsa, john.fastabend, hpa, haoluo,
guoren, glaubitz, geert, gary, eddyz87, dinguyen, dave.hansen,
daniel, dalias, bp, boqun.feng, ast, arnd, ardb, andrii, fthain,
akpm
The patch titled
Subject: bpf: explicitly align bpf_res_spin_lock
has been added to the -mm mm-nonmm-unstable branch. Its filename is
bpf-explicitly-align-bpf_res_spin_lock.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/bpf-explicitly-align-bpf_res_spin_lock.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days
------------------------------------------------------
From: Finn Thain <fthain@linux-m68k.org>
Subject: bpf: explicitly align bpf_res_spin_lock
Date: Wed, 31 Dec 2025 19:25:42 +1100
Patch series "Align atomic storage", v6.
This series adds the __aligned attribute to atomic_t and atomic64_t
definitions in include/linux and include/asm-generic (respectively) to get
natural alignment of both types on csky, m68k, microblaze, nios2, openrisc
and sh.
This series also adds Kconfig options to enable a new run-time warning to
help reveal misaligned atomic accesses on platforms which don't trap that.
The performance impact is expected to vary across platforms and workloads.
The measurements I made on m68k show that some workloads run faster and
others slower.
This patch (of 4):
Align bpf_res_spin_lock to avoid a BUILD_BUG_ON() when the alignment
changes, as it will do on m68k when, in a subsequent patch, the minimum
alignment of the atomic_t member of struct rqspinlock gets increased from
2 to 4. Drop the BUILD_BUG_ON() as it becomes redundant.
Link: https://lkml.kernel.org/r/cover.1767169542.git.fthain@linux-m68k.org
Link: https://lkml.kernel.org/r/5803c4a180975f102bc8f78a3251540f0396fa46.1767169542.git.fthain@linux-m68k.org
Signed-off-by: Finn Thain <fthain@linux-m68k.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: Daniel Borkman <daniel@iogearbox.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Gary Guo <gary@garyguo.net>
Cc: Guo Ren <guoren@kernel.org>
Cc: Hao Luo <haoluo@google.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: KP Singh <kpsingh@kernel.org>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Sasha Levin (Microsoft) <sashal@kernel.org>
Cc: Song Liu <song@kernel.org>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stanislav Fomichev <sdf@fomichev.me>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: Yonghong Song <yonghong.song@linux.dev>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/asm-generic/rqspinlock.h | 2 +-
kernel/bpf/rqspinlock.c | 1 -
2 files changed, 1 insertion(+), 2 deletions(-)
--- a/include/asm-generic/rqspinlock.h~bpf-explicitly-align-bpf_res_spin_lock
+++ a/include/asm-generic/rqspinlock.h
@@ -28,7 +28,7 @@ struct rqspinlock {
*/
struct bpf_res_spin_lock {
u32 val;
-};
+} __aligned(__alignof__(struct rqspinlock));
struct qspinlock;
#ifdef CONFIG_QUEUED_SPINLOCKS
--- a/kernel/bpf/rqspinlock.c~bpf-explicitly-align-bpf_res_spin_lock
+++ a/kernel/bpf/rqspinlock.c
@@ -694,7 +694,6 @@ __bpf_kfunc int bpf_res_spin_lock(struct
int ret;
BUILD_BUG_ON(sizeof(rqspinlock_t) != sizeof(struct bpf_res_spin_lock));
- BUILD_BUG_ON(__alignof__(rqspinlock_t) != __alignof__(struct bpf_res_spin_lock));
preempt_disable();
ret = res_spin_lock((rqspinlock_t *)lock);
_
Patches currently in -mm which might be from fthain@linux-m68k.org are
bpf-explicitly-align-bpf_res_spin_lock.patch
atomic-specify-alignment-for-atomic_t-and-atomic64_t.patch
atomic-add-option-for-weaker-alignment-check.patch
^ permalink raw reply [flat|nested] 3+ messages in thread* + bpf-explicitly-align-bpf_res_spin_lock.patch added to mm-nonmm-unstable branch
@ 2026-01-13 23:34 Andrew Morton
0 siblings, 0 replies; 3+ messages in thread
From: Andrew Morton @ 2026-01-13 23:34 UTC (permalink / raw)
To: mm-commits, ysato, yonghong.song, will, tglx, stefan.kristiansson,
song, shorne, sdf, sashal, peterz, mingo, martin.lau,
mark.rutland, kpsingh, jonas, jolsa, john.fastabend, hpa, haoluo,
guoren, glaubitz, geert, gary, eddyz87, dinguyen, dave.hansen,
daniel, dalias, bp, boqun.feng, ast, arnd, ardb, andrii, fthain,
akpm
The patch titled
Subject: bpf: explicitly align bpf_res_spin_lock
has been added to the -mm mm-nonmm-unstable branch. Its filename is
bpf-explicitly-align-bpf_res_spin_lock.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/bpf-explicitly-align-bpf_res_spin_lock.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days
------------------------------------------------------
From: Finn Thain <fthain@linux-m68k.org>
Subject: bpf: explicitly align bpf_res_spin_lock
Date: Tue, 13 Jan 2026 16:22:28 +1100
Patch series "Align atomic storage", v7.
This series adds the __aligned attribute to atomic_t and atomic64_t
definitions in include/linux and include/asm-generic (respectively) to get
natural alignment of both types on csky, m68k, microblaze, nios2, openrisc
and sh.
This series also adds Kconfig options to enable a new run-time warning to
help reveal misaligned atomic accesses on platforms which don't trap that.
The performance impact is expected to vary across platforms and workloads.
The measurements I made on m68k show that some workloads run faster and
others slower.
This patch (of 4):
Align bpf_res_spin_lock to avoid a BUILD_BUG_ON() when the alignment
changes, as it will do on m68k when, in a subsequent patch, the minimum
alignment of the atomic_t member of struct rqspinlock gets increased from
2 to 4. Drop the BUILD_BUG_ON() as it becomes redundant.
Link: https://lkml.kernel.org/r/cover.1768281748.git.fthain@linux-m68k.org
Link: https://lkml.kernel.org/r/8a83876b07d1feacc024521e44059ae89abbb1ea.1768281748.git.fthain@linux-m68k.org
Signed-off-by: Finn Thain <fthain@linux-m68k.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: "Borislav Petkov (AMD)" <bp@alien8.de>
Cc: Daniel Borkman <daniel@iogearbox.net>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Gary Guo <gary@garyguo.net>
Cc: Guo Ren <guoren@kernel.org>
Cc: Hao Luo <haoluo@google.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: KP Singh <kpsingh@kernel.org>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Sasha Levin (Microsoft) <sashal@kernel.org>
Cc: Song Liu <song@kernel.org>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stanislav Fomichev <sdf@fomichev.me>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: Yonghong Song <yonghong.song@linux.dev>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/asm-generic/rqspinlock.h | 2 +-
kernel/bpf/rqspinlock.c | 1 -
2 files changed, 1 insertion(+), 2 deletions(-)
--- a/include/asm-generic/rqspinlock.h~bpf-explicitly-align-bpf_res_spin_lock
+++ a/include/asm-generic/rqspinlock.h
@@ -28,7 +28,7 @@ struct rqspinlock {
*/
struct bpf_res_spin_lock {
u32 val;
-};
+} __aligned(__alignof__(struct rqspinlock));
struct qspinlock;
#ifdef CONFIG_QUEUED_SPINLOCKS
--- a/kernel/bpf/rqspinlock.c~bpf-explicitly-align-bpf_res_spin_lock
+++ a/kernel/bpf/rqspinlock.c
@@ -694,7 +694,6 @@ __bpf_kfunc int bpf_res_spin_lock(struct
int ret;
BUILD_BUG_ON(sizeof(rqspinlock_t) != sizeof(struct bpf_res_spin_lock));
- BUILD_BUG_ON(__alignof__(rqspinlock_t) != __alignof__(struct bpf_res_spin_lock));
preempt_disable();
ret = res_spin_lock((rqspinlock_t *)lock);
_
Patches currently in -mm which might be from fthain@linux-m68k.org are
bpf-explicitly-align-bpf_res_spin_lock.patch
atomic-specify-alignment-for-atomic_t-and-atomic64_t.patch
atomic-add-option-for-weaker-alignment-check.patch
^ permalink raw reply [flat|nested] 3+ messages in thread* + bpf-explicitly-align-bpf_res_spin_lock.patch added to mm-nonmm-unstable branch
@ 2025-12-16 19:49 Andrew Morton
0 siblings, 0 replies; 3+ messages in thread
From: Andrew Morton @ 2025-12-16 19:49 UTC (permalink / raw)
To: mm-commits, ysato, yonghong.song, will, stefan.kristiansson, song,
shorne, sdf, peterz, martin.lau, mark.rutland, kpsingh, jonas,
jolsa, john.fastabend, haoluo, guoren, glaubitz, geert, gary,
eddyz87, dinguyen, daniel, dalias, boqun.feng, ast, arnd, andrii,
fthain, akpm
The patch titled
Subject: bpf: explicitly align bpf_res_spin_lock
has been added to the -mm mm-nonmm-unstable branch. Its filename is
bpf-explicitly-align-bpf_res_spin_lock.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/bpf-explicitly-align-bpf_res_spin_lock.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days
------------------------------------------------------
From: Finn Thain <fthain@linux-m68k.org>
Subject: bpf: explicitly align bpf_res_spin_lock
Date: Tue, 16 Dec 2025 17:31:05 +1100
Patch series "Align atomic storage", v5.
This series adds the __aligned attribute to atomic_t and atomic64_t
definitions in include/linux and include/asm-generic (respectively) to get
natural alignment of both types on csky, m68k, microblaze, nios2, openrisc
and sh.
This series also adds Kconfig options to enable a new run-time warning to
help reveal misaligned atomic accesses on platforms which don't trap that.
The performance impact is expected to vary across platforms and workloads.
The measurements I made on m68k show that some workloads run faster and
others slower.
This patch (of 4):
Align bpf_res_spin_lock to avoid a BUILD_BUG_ON() when the alignment
changes, as it will do on m68k when, in a subsequent patch, the minimum
alignment of the atomic_t member of struct rqspinlock gets increased from
2 to 4. Drop the BUILD_BUG_ON() as it becomes redundant.
Link: https://lkml.kernel.org/r/cover.1765866665.git.fthain@linux-m68k.org
Link: https://lkml.kernel.org/r/4ff540deaf87eb24ba11bbac95bdbea68d22a129.1765866665.git.fthain@linux-m68k.org
Signed-off-by: Finn Thain <fthain@linux-m68k.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Daniel Borkman <daniel@iogearbox.net>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Gary Guo <gary@garyguo.net>
Cc: Guo Ren <guoren@kernel.org>
Cc: Hao Luo <haoluo@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: KP Singh <kpsingh@kernel.org>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Song Liu <song@kernel.org>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stanislav Fomichev <sdf@fomichev.me>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Will Deacon <will@kernel.org>
Cc: Yonghong Song <yonghong.song@linux.dev>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/asm-generic/rqspinlock.h | 2 +-
kernel/bpf/rqspinlock.c | 1 -
2 files changed, 1 insertion(+), 2 deletions(-)
--- a/include/asm-generic/rqspinlock.h~bpf-explicitly-align-bpf_res_spin_lock
+++ a/include/asm-generic/rqspinlock.h
@@ -28,7 +28,7 @@ struct rqspinlock {
*/
struct bpf_res_spin_lock {
u32 val;
-};
+} __aligned(__alignof__(struct rqspinlock));
struct qspinlock;
#ifdef CONFIG_QUEUED_SPINLOCKS
--- a/kernel/bpf/rqspinlock.c~bpf-explicitly-align-bpf_res_spin_lock
+++ a/kernel/bpf/rqspinlock.c
@@ -694,7 +694,6 @@ __bpf_kfunc int bpf_res_spin_lock(struct
int ret;
BUILD_BUG_ON(sizeof(rqspinlock_t) != sizeof(struct bpf_res_spin_lock));
- BUILD_BUG_ON(__alignof__(rqspinlock_t) != __alignof__(struct bpf_res_spin_lock));
preempt_disable();
ret = res_spin_lock((rqspinlock_t *)lock);
_
Patches currently in -mm which might be from fthain@linux-m68k.org are
bpf-explicitly-align-bpf_res_spin_lock.patch
atomic-specify-alignment-for-atomic_t-and-atomic64_t.patch
atomic-add-option-for-weaker-alignment-check.patch
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2026-01-13 23:34 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2025-12-27 15:09 + bpf-explicitly-align-bpf_res_spin_lock.patch added to mm-nonmm-unstable branch Andrew Morton
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2026-01-13 23:34 Andrew Morton
2025-12-16 19:49 Andrew Morton
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