From: Andrew Morton <akpm@linux-foundation.org>
To: mm-commits@vger.kernel.org,surenb@google.com,rppt@kernel.org,ritesh.list@gmail.com,mhocko@suse.com,ljs@kernel.org,liam.howlett@oracle.com,david@kernel.org,baolin.wang@linux.alibaba.com,akpm@linux-foundation.org
Subject: + mm-change-to-return-bool-for-the-mmu-notifiers-young-flag-check.patch added to mm-new branch
Date: Sat, 21 Mar 2026 11:10:52 -0700 [thread overview]
Message-ID: <20260321181052.ECCA8C2BCAF@smtp.kernel.org> (raw)
The patch titled
Subject: mm: change to return bool for the MMU notifier's young flag check
has been added to the -mm mm-new branch. Its filename is
mm-change-to-return-bool-for-the-mmu-notifiers-young-flag-check.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-change-to-return-bool-for-the-mmu-notifiers-young-flag-check.patch
This patch will later appear in the mm-new branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews. Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.
The mm-new branch of mm.git is not included in linux-next
If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next
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*** 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: Baolin Wang <baolin.wang@linux.alibaba.com>
Subject: mm: change to return bool for the MMU notifier's young flag check
Date: Sat, 21 Mar 2026 14:42:54 +0800
The MMU notifier young flag check related functions only return whether
the young flag was set. Change the return type to bool to make the
intention clearer.
Link: https://lkml.kernel.org/r/a9ad3fe938002d87358e7bfca264f753ab602561.1774075004.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/mmu_notifier.h | 76 +++++++++++++++------------------
mm/internal.h | 16 +++---
mm/mmu_notifier.c | 23 +++++----
virt/kvm/kvm_main.c | 31 ++++---------
4 files changed, 66 insertions(+), 80 deletions(-)
--- a/include/linux/mmu_notifier.h~mm-change-to-return-bool-for-the-mmu-notifiers-young-flag-check
+++ a/include/linux/mmu_notifier.h
@@ -97,20 +97,20 @@ struct mmu_notifier_ops {
* Start-end is necessary in case the secondary MMU is mapping the page
* at a smaller granularity than the primary MMU.
*/
- int (*clear_flush_young)(struct mmu_notifier *subscription,
- struct mm_struct *mm,
- unsigned long start,
- unsigned long end);
+ bool (*clear_flush_young)(struct mmu_notifier *subscription,
+ struct mm_struct *mm,
+ unsigned long start,
+ unsigned long end);
/*
* clear_young is a lightweight version of clear_flush_young. Like the
* latter, it is supposed to test-and-clear the young/accessed bitflag
* in the secondary pte, but it may omit flushing the secondary tlb.
*/
- int (*clear_young)(struct mmu_notifier *subscription,
- struct mm_struct *mm,
- unsigned long start,
- unsigned long end);
+ bool (*clear_young)(struct mmu_notifier *subscription,
+ struct mm_struct *mm,
+ unsigned long start,
+ unsigned long end);
/*
* test_young is called to check the young/accessed bitflag in
@@ -118,9 +118,9 @@ struct mmu_notifier_ops {
* frequently used without actually clearing the flag or tearing
* down the secondary mapping on the page.
*/
- int (*test_young)(struct mmu_notifier *subscription,
- struct mm_struct *mm,
- unsigned long address);
+ bool (*test_young)(struct mmu_notifier *subscription,
+ struct mm_struct *mm,
+ unsigned long address);
/*
* invalidate_range_start() and invalidate_range_end() must be
@@ -376,14 +376,12 @@ mmu_interval_check_retry(struct mmu_inte
extern void __mmu_notifier_subscriptions_destroy(struct mm_struct *mm);
extern void __mmu_notifier_release(struct mm_struct *mm);
-extern int __mmu_notifier_clear_flush_young(struct mm_struct *mm,
- unsigned long start,
- unsigned long end);
-extern int __mmu_notifier_clear_young(struct mm_struct *mm,
- unsigned long start,
- unsigned long end);
-extern int __mmu_notifier_test_young(struct mm_struct *mm,
- unsigned long address);
+bool __mmu_notifier_clear_flush_young(struct mm_struct *mm,
+ unsigned long start, unsigned long end);
+bool __mmu_notifier_clear_young(struct mm_struct *mm,
+ unsigned long start, unsigned long end);
+bool __mmu_notifier_test_young(struct mm_struct *mm,
+ unsigned long address);
extern int __mmu_notifier_invalidate_range_start(struct mmu_notifier_range *r);
extern void __mmu_notifier_invalidate_range_end(struct mmu_notifier_range *r);
extern void __mmu_notifier_arch_invalidate_secondary_tlbs(struct mm_struct *mm,
@@ -403,30 +401,28 @@ static inline void mmu_notifier_release(
__mmu_notifier_release(mm);
}
-static inline int mmu_notifier_clear_flush_young(struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
+static inline bool mmu_notifier_clear_flush_young(struct mm_struct *mm,
+ unsigned long start, unsigned long end)
{
if (mm_has_notifiers(mm))
return __mmu_notifier_clear_flush_young(mm, start, end);
- return 0;
+ return false;
}
-static inline int mmu_notifier_clear_young(struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
+static inline bool mmu_notifier_clear_young(struct mm_struct *mm,
+ unsigned long start, unsigned long end)
{
if (mm_has_notifiers(mm))
return __mmu_notifier_clear_young(mm, start, end);
- return 0;
+ return false;
}
-static inline int mmu_notifier_test_young(struct mm_struct *mm,
- unsigned long address)
+static inline bool mmu_notifier_test_young(struct mm_struct *mm,
+ unsigned long address)
{
if (mm_has_notifiers(mm))
return __mmu_notifier_test_young(mm, address);
- return 0;
+ return false;
}
static inline void
@@ -552,24 +548,22 @@ static inline void mmu_notifier_release(
{
}
-static inline int mmu_notifier_clear_flush_young(struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
+static inline bool mmu_notifier_clear_flush_young(struct mm_struct *mm,
+ unsigned long start, unsigned long end)
{
- return 0;
+ return false;
}
-static inline int mmu_notifier_clear_young(struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
+static inline bool mmu_notifier_clear_young(struct mm_struct *mm,
+ unsigned long start, unsigned long end)
{
- return 0;
+ return false;
}
-static inline int mmu_notifier_test_young(struct mm_struct *mm,
- unsigned long address)
+static inline bool mmu_notifier_test_young(struct mm_struct *mm,
+ unsigned long address)
{
- return 0;
+ return false;
}
static inline void
--- a/mm/internal.h~mm-change-to-return-bool-for-the-mmu-notifiers-young-flag-check
+++ a/mm/internal.h
@@ -1885,10 +1885,10 @@ static inline void maybe_rmap_unlock_act
}
#ifdef CONFIG_MMU_NOTIFIER
-static inline int clear_flush_young_ptes_notify(struct vm_area_struct *vma,
+static inline bool clear_flush_young_ptes_notify(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep, unsigned int nr)
{
- int young;
+ bool young;
young = clear_flush_young_ptes(vma, addr, ptep, nr);
young |= mmu_notifier_clear_flush_young(vma->vm_mm, addr,
@@ -1896,30 +1896,30 @@ static inline int clear_flush_young_ptes
return young;
}
-static inline int pmdp_clear_flush_young_notify(struct vm_area_struct *vma,
+static inline bool pmdp_clear_flush_young_notify(struct vm_area_struct *vma,
unsigned long addr, pmd_t *pmdp)
{
- int young;
+ bool young;
young = pmdp_clear_flush_young(vma, addr, pmdp);
young |= mmu_notifier_clear_flush_young(vma->vm_mm, addr, addr + PMD_SIZE);
return young;
}
-static inline int test_and_clear_young_ptes_notify(struct vm_area_struct *vma,
+static inline bool test_and_clear_young_ptes_notify(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep, unsigned int nr)
{
- int young;
+ bool young;
young = test_and_clear_young_ptes(vma, addr, ptep, nr);
young |= mmu_notifier_clear_young(vma->vm_mm, addr, addr + nr * PAGE_SIZE);
return young;
}
-static inline int pmdp_test_and_clear_young_notify(struct vm_area_struct *vma,
+static inline bool pmdp_test_and_clear_young_notify(struct vm_area_struct *vma,
unsigned long addr, pmd_t *pmdp)
{
- int young;
+ bool young;
young = pmdp_test_and_clear_young(vma, addr, pmdp);
young |= mmu_notifier_clear_young(vma->vm_mm, addr, addr + PMD_SIZE);
--- a/mm/mmu_notifier.c~mm-change-to-return-bool-for-the-mmu-notifiers-young-flag-check
+++ a/mm/mmu_notifier.c
@@ -364,12 +364,12 @@ void __mmu_notifier_release(struct mm_st
* unmap the address and return 1 or 0 depending if the mapping previously
* existed or not.
*/
-int __mmu_notifier_clear_flush_young(struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
+bool __mmu_notifier_clear_flush_young(struct mm_struct *mm,
+ unsigned long start, unsigned long end)
{
struct mmu_notifier *subscription;
- int young = 0, id;
+ bool young = false;
+ int id;
id = srcu_read_lock(&srcu);
hlist_for_each_entry_srcu(subscription,
@@ -384,12 +384,12 @@ int __mmu_notifier_clear_flush_young(str
return young;
}
-int __mmu_notifier_clear_young(struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
+bool __mmu_notifier_clear_young(struct mm_struct *mm,
+ unsigned long start, unsigned long end)
{
struct mmu_notifier *subscription;
- int young = 0, id;
+ bool young = false;
+ int id;
id = srcu_read_lock(&srcu);
hlist_for_each_entry_srcu(subscription,
@@ -404,11 +404,12 @@ int __mmu_notifier_clear_young(struct mm
return young;
}
-int __mmu_notifier_test_young(struct mm_struct *mm,
- unsigned long address)
+bool __mmu_notifier_test_young(struct mm_struct *mm,
+ unsigned long address)
{
struct mmu_notifier *subscription;
- int young = 0, id;
+ bool young = false;
+ int id;
id = srcu_read_lock(&srcu);
hlist_for_each_entry_srcu(subscription,
--- a/virt/kvm/kvm_main.c~mm-change-to-return-bool-for-the-mmu-notifiers-young-flag-check
+++ a/virt/kvm/kvm_main.c
@@ -646,11 +646,9 @@ mmu_unlock:
return r;
}
-static __always_inline int kvm_age_hva_range(struct mmu_notifier *mn,
- unsigned long start,
- unsigned long end,
- gfn_handler_t handler,
- bool flush_on_ret)
+static __always_inline bool kvm_age_hva_range(struct mmu_notifier *mn,
+ unsigned long start, unsigned long end, gfn_handler_t handler,
+ bool flush_on_ret)
{
struct kvm *kvm = mmu_notifier_to_kvm(mn);
const struct kvm_mmu_notifier_range range = {
@@ -666,10 +664,8 @@ static __always_inline int kvm_age_hva_r
return kvm_handle_hva_range(kvm, &range).ret;
}
-static __always_inline int kvm_age_hva_range_no_flush(struct mmu_notifier *mn,
- unsigned long start,
- unsigned long end,
- gfn_handler_t handler)
+static __always_inline bool kvm_age_hva_range_no_flush(struct mmu_notifier *mn,
+ unsigned long start, unsigned long end, gfn_handler_t handler)
{
return kvm_age_hva_range(mn, start, end, handler, false);
}
@@ -829,10 +825,8 @@ static void kvm_mmu_notifier_invalidate_
rcuwait_wake_up(&kvm->mn_memslots_update_rcuwait);
}
-static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
- struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
+static bool kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
+ struct mm_struct *mm, unsigned long start, unsigned long end)
{
trace_kvm_age_hva(start, end);
@@ -840,10 +834,8 @@ static int kvm_mmu_notifier_clear_flush_
!IS_ENABLED(CONFIG_KVM_ELIDE_TLB_FLUSH_IF_YOUNG));
}
-static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn,
- struct mm_struct *mm,
- unsigned long start,
- unsigned long end)
+static bool kvm_mmu_notifier_clear_young(struct mmu_notifier *mn,
+ struct mm_struct *mm, unsigned long start, unsigned long end)
{
trace_kvm_age_hva(start, end);
@@ -863,9 +855,8 @@ static int kvm_mmu_notifier_clear_young(
return kvm_age_hva_range_no_flush(mn, start, end, kvm_age_gfn);
}
-static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
- struct mm_struct *mm,
- unsigned long address)
+static bool kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
+ struct mm_struct *mm, unsigned long address)
{
trace_kvm_test_age_hva(address);
_
Patches currently in -mm which might be from baolin.wang@linux.alibaba.com are
mm-filemap-fix-nr_pages-calculation-overflow-in-filemap_map_pages.patch
mm-use-inline-helper-functions-instead-of-ugly-macros.patch
mm-rename-ptep-pmdp_clear_young_notify-to-ptep-pmdp_test_and_clear_young_notify.patch
mm-rmap-add-a-zone_device-folio-warning-in-folio_referenced.patch
mm-add-a-batched-helper-to-clear-the-young-flag-for-large-folios.patch
mm-support-batched-checking-of-the-young-flag-for-mglru.patch
arm64-mm-implement-the-architecture-specific-test_and_clear_young_ptes.patch
mm-change-to-return-bool-for-ptep_test_and_clear_young.patch
mm-change-to-return-bool-for-ptep_clear_flush_young-clear_flush_young_ptes.patch
mm-change-to-return-bool-for-pmdp_test_and_clear_young.patch
mm-change-to-return-bool-for-pmdp_clear_flush_young.patch
mm-change-to-return-bool-for-pudp_test_and_clear_young.patch
mm-change-to-return-bool-for-the-mmu-notifiers-young-flag-check.patch
reply other threads:[~2026-03-21 18:10 UTC|newest]
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