From: Baolin Wang <baolin.wang@linux.alibaba.com>
To: akpm@linux-foundation.org, david@kernel.org
Cc: ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org,
rppt@kernel.org, surenb@google.com, mhocko@suse.com,
baolin.wang@linux.alibaba.com,
linux-arm-kernel@lists.infradead.org, x86@kernel.org,
linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org,
kvm@vger.kernel.org, linux-mm@kvack.org (open),
linux-kernel@vger.kernel.org
Subject: [PATCH v2 1/6] mm: change to return bool for ptep_test_and_clear_young()
Date: Sat, 21 Mar 2026 14:42:49 +0800 [thread overview]
Message-ID: <57e70efa9703d43959aa645246ea3cbdba14fa17.1774075004.git.baolin.wang@linux.alibaba.com> (raw)
In-Reply-To: <cover.1774075004.git.baolin.wang@linux.alibaba.com>
Callers use ptep_test_and_clear_young() to clear the young flag and check
whether it was set. Change the return type to bool to make the intention
clearer.
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
---
arch/arm64/include/asm/pgtable.h | 16 +++++++---------
arch/arm64/mm/contpte.c | 7 +++----
arch/microblaze/include/asm/pgtable.h | 2 +-
arch/parisc/include/asm/pgtable.h | 7 ++++---
arch/powerpc/include/asm/book3s/32/pgtable.h | 4 ++--
arch/powerpc/include/asm/book3s/64/pgtable.h | 6 +++---
arch/powerpc/include/asm/nohash/pgtable.h | 4 ++--
arch/riscv/include/asm/pgtable.h | 4 ++--
arch/riscv/mm/pgtable.c | 7 +++----
arch/s390/include/asm/pgtable.h | 4 ++--
arch/x86/include/asm/pgtable.h | 4 ++--
arch/x86/mm/pgtable.c | 6 +++---
arch/xtensa/include/asm/pgtable.h | 9 ++++-----
include/linux/pgtable.h | 16 ++++++++--------
14 files changed, 46 insertions(+), 50 deletions(-)
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index ab451d20e4c5..79596cc05dcb 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -1282,9 +1282,8 @@ static inline void __pte_clear(struct mm_struct *mm,
__set_pte(ptep, __pte(0));
}
-static inline int __ptep_test_and_clear_young(struct vm_area_struct *vma,
- unsigned long address,
- pte_t *ptep)
+static inline bool __ptep_test_and_clear_young(struct vm_area_struct *vma,
+ unsigned long address, pte_t *ptep)
{
pte_t old_pte, pte;
@@ -1646,7 +1645,7 @@ extern void contpte_clear_full_ptes(struct mm_struct *mm, unsigned long addr,
extern pte_t contpte_get_and_clear_full_ptes(struct mm_struct *mm,
unsigned long addr, pte_t *ptep,
unsigned int nr, int full);
-int contpte_test_and_clear_young_ptes(struct vm_area_struct *vma,
+bool contpte_test_and_clear_young_ptes(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep, unsigned int nr);
int contpte_clear_flush_young_ptes(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep, unsigned int nr);
@@ -1813,9 +1812,8 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
}
#define test_and_clear_young_ptes test_and_clear_young_ptes
-static inline int test_and_clear_young_ptes(struct vm_area_struct *vma,
- unsigned long addr, pte_t *ptep,
- unsigned int nr)
+static inline bool test_and_clear_young_ptes(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep, unsigned int nr)
{
if (likely(nr == 1 && !pte_cont(__ptep_get(ptep))))
return __ptep_test_and_clear_young(vma, addr, ptep);
@@ -1824,8 +1822,8 @@ static inline int test_and_clear_young_ptes(struct vm_area_struct *vma,
}
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
-static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
- unsigned long addr, pte_t *ptep)
+static inline bool ptep_test_and_clear_young(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep)
{
return test_and_clear_young_ptes(vma, addr, ptep, 1);
}
diff --git a/arch/arm64/mm/contpte.c b/arch/arm64/mm/contpte.c
index 1519d090d5ea..a31cae78f712 100644
--- a/arch/arm64/mm/contpte.c
+++ b/arch/arm64/mm/contpte.c
@@ -508,9 +508,8 @@ pte_t contpte_get_and_clear_full_ptes(struct mm_struct *mm,
}
EXPORT_SYMBOL_GPL(contpte_get_and_clear_full_ptes);
-int contpte_test_and_clear_young_ptes(struct vm_area_struct *vma,
- unsigned long addr, pte_t *ptep,
- unsigned int nr)
+bool contpte_test_and_clear_young_ptes(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep, unsigned int nr)
{
/*
* ptep_clear_flush_young() technically requires us to clear the access
@@ -525,7 +524,7 @@ int contpte_test_and_clear_young_ptes(struct vm_area_struct *vma,
*/
unsigned long end = addr + nr * PAGE_SIZE;
- int young = 0;
+ bool young = false;
ptep = contpte_align_addr_ptep(&addr, &end, ptep, nr);
for (; addr != end; ptep++, addr += PAGE_SIZE)
diff --git a/arch/microblaze/include/asm/pgtable.h b/arch/microblaze/include/asm/pgtable.h
index ea72291de553..7678c040a2fd 100644
--- a/arch/microblaze/include/asm/pgtable.h
+++ b/arch/microblaze/include/asm/pgtable.h
@@ -318,7 +318,7 @@ static inline void set_pte(pte_t *ptep, pte_t pte)
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
struct vm_area_struct;
-static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
+static inline bool ptep_test_and_clear_young(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep)
{
return (pte_update(ptep, _PAGE_ACCESSED, 0) & _PAGE_ACCESSED) != 0;
diff --git a/arch/parisc/include/asm/pgtable.h b/arch/parisc/include/asm/pgtable.h
index f6fb99cb94d9..7097c785f690 100644
--- a/arch/parisc/include/asm/pgtable.h
+++ b/arch/parisc/include/asm/pgtable.h
@@ -438,16 +438,17 @@ static inline pte_t ptep_get(pte_t *ptep)
}
#define ptep_get ptep_get
-static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
+static inline bool ptep_test_and_clear_young(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep)
{
pte_t pte;
pte = ptep_get(ptep);
if (!pte_young(pte)) {
- return 0;
+ return false;
}
set_pte_at(vma->vm_mm, addr, ptep, pte_mkold(pte));
- return 1;
+ return true;
}
int ptep_clear_flush_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep);
diff --git a/arch/powerpc/include/asm/book3s/32/pgtable.h b/arch/powerpc/include/asm/book3s/32/pgtable.h
index 001e28f9eabc..4a271318dee8 100644
--- a/arch/powerpc/include/asm/book3s/32/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/32/pgtable.h
@@ -295,8 +295,8 @@ static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, p
* for our hash-based implementation, we fix that up here.
*/
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
-static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
- unsigned long addr, pte_t *ptep)
+static inline bool __ptep_test_and_clear_young(struct mm_struct *mm,
+ unsigned long addr, pte_t *ptep)
{
unsigned long old;
old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0);
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 1a91762b455d..c049a2e26e25 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -349,13 +349,13 @@ static inline unsigned long pte_update(struct mm_struct *mm, unsigned long addr,
* For radix: H_PAGE_HASHPTE should be zero. Hence we can use the same
* function for both hash and radix.
*/
-static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
- unsigned long addr, pte_t *ptep)
+static inline bool __ptep_test_and_clear_young(struct mm_struct *mm,
+ unsigned long addr, pte_t *ptep)
{
unsigned long old;
if ((pte_raw(*ptep) & cpu_to_be64(_PAGE_ACCESSED | H_PAGE_HASHPTE)) == 0)
- return 0;
+ return false;
old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0);
return (old & _PAGE_ACCESSED) != 0;
}
diff --git a/arch/powerpc/include/asm/nohash/pgtable.h b/arch/powerpc/include/asm/nohash/pgtable.h
index e6da5eaccff6..3a6f20a1c800 100644
--- a/arch/powerpc/include/asm/nohash/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/pgtable.h
@@ -101,8 +101,8 @@ static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, p
}
#endif
-static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
- unsigned long addr, pte_t *ptep)
+static inline bool ptep_test_and_clear_young(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep)
{
unsigned long old;
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index ab4ce1cc9d9c..643d12481b02 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -659,8 +659,8 @@ static inline void pte_clear(struct mm_struct *mm,
extern int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address,
pte_t *ptep, pte_t entry, int dirty);
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG /* defined in mm/pgtable.c */
-extern int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long address,
- pte_t *ptep);
+bool ptep_test_and_clear_young(struct vm_area_struct *vma,
+ unsigned long address, pte_t *ptep);
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
diff --git a/arch/riscv/mm/pgtable.c b/arch/riscv/mm/pgtable.c
index b1ed2f14dc3a..9c4427d0b187 100644
--- a/arch/riscv/mm/pgtable.c
+++ b/arch/riscv/mm/pgtable.c
@@ -29,12 +29,11 @@ int ptep_set_access_flags(struct vm_area_struct *vma,
return true;
}
-int ptep_test_and_clear_young(struct vm_area_struct *vma,
- unsigned long address,
- pte_t *ptep)
+bool ptep_test_and_clear_young(struct vm_area_struct *vma,
+ unsigned long address, pte_t *ptep)
{
if (!pte_young(ptep_get(ptep)))
- return 0;
+ return false;
return test_and_clear_bit(_PAGE_ACCESSED_OFFSET, &pte_val(*ptep));
}
EXPORT_SYMBOL_GPL(ptep_test_and_clear_young);
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 1c3c3be93be9..ef4748ee3a2b 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1164,8 +1164,8 @@ pte_t ptep_xchg_direct(struct mm_struct *, unsigned long, pte_t *, pte_t);
pte_t ptep_xchg_lazy(struct mm_struct *, unsigned long, pte_t *, pte_t);
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
-static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
- unsigned long addr, pte_t *ptep)
+static inline bool ptep_test_and_clear_young(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep)
{
pte_t pte = *ptep;
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 54289f4587a4..1d86fb33239f 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1232,8 +1232,8 @@ extern int ptep_set_access_flags(struct vm_area_struct *vma,
pte_t entry, int dirty);
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
-extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
- unsigned long addr, pte_t *ptep);
+bool ptep_test_and_clear_young(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep);
#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
extern int ptep_clear_flush_young(struct vm_area_struct *vma,
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index 2e5ecfdce73c..5ee38dda9124 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -443,10 +443,10 @@ int pudp_set_access_flags(struct vm_area_struct *vma, unsigned long address,
}
#endif
-int ptep_test_and_clear_young(struct vm_area_struct *vma,
- unsigned long addr, pte_t *ptep)
+bool ptep_test_and_clear_young(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep)
{
- int ret = 0;
+ bool ret = false;
if (pte_young(*ptep))
ret = test_and_clear_bit(_PAGE_BIT_ACCESSED,
diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h
index 61f07d981a94..f00a879dc298 100644
--- a/arch/xtensa/include/asm/pgtable.h
+++ b/arch/xtensa/include/asm/pgtable.h
@@ -304,15 +304,14 @@ set_pmd(pmd_t *pmdp, pmd_t pmdval)
struct vm_area_struct;
-static inline int
-ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr,
- pte_t *ptep)
+static inline bool ptep_test_and_clear_young(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep)
{
pte_t pte = *ptep;
if (!pte_young(pte))
- return 0;
+ return false;
update_pte(ptep, pte_mkold(pte));
- return 1;
+ return true;
}
static inline pte_t
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 17d961c612fc..8e75dc9f7932 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -491,17 +491,17 @@ static inline pgd_t pgdp_get(pgd_t *pgdp)
#endif
#ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
-static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
- unsigned long address,
- pte_t *ptep)
+static inline bool ptep_test_and_clear_young(struct vm_area_struct *vma,
+ unsigned long address, pte_t *ptep)
{
pte_t pte = ptep_get(ptep);
- int r = 1;
+ bool young = true;
+
if (!pte_young(pte))
- r = 0;
+ young = false;
else
set_pte_at(vma->vm_mm, address, ptep, pte_mkold(pte));
- return r;
+ return young;
}
#endif
@@ -1123,10 +1123,10 @@ static inline int clear_flush_young_ptes(struct vm_area_struct *vma,
*
* Returns: whether any PTE was young.
*/
-static inline int test_and_clear_young_ptes(struct vm_area_struct *vma,
+static inline bool test_and_clear_young_ptes(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep, unsigned int nr)
{
- int young = 0;
+ bool young = false;
for (;;) {
young |= ptep_test_and_clear_young(vma, addr, ptep);
--
2.47.3
next prev parent reply other threads:[~2026-03-21 6:43 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-21 6:42 [PATCH v2 0/6] change young flag check functions to return bool Baolin Wang
2026-03-21 6:42 ` Baolin Wang [this message]
2026-03-21 6:42 ` [PATCH v2 2/6] mm: change to return bool for ptep_clear_flush_young()/clear_flush_young_ptes() Baolin Wang
2026-03-21 6:42 ` [PATCH v2 3/6] mm: change to return bool for pmdp_test_and_clear_young() Baolin Wang
2026-03-21 6:42 ` [PATCH v2 4/6] mm: change to return bool for pmdp_clear_flush_young() Baolin Wang
2026-03-21 6:42 ` [PATCH v2 5/6] mm: change to return bool for pudp_test_and_clear_young() Baolin Wang
2026-03-21 6:42 ` [PATCH v2 6/6] mm: change to return bool for the MMU notifier's young flag check Baolin Wang
2026-03-27 13:28 ` [PATCH v2 0/6] change young flag check functions to return bool David Hildenbrand (Arm)
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=57e70efa9703d43959aa645246ea3cbdba14fa17.1774075004.git.baolin.wang@linux.alibaba.com \
--to=baolin.wang@linux.alibaba.com \
--cc=Liam.Howlett@oracle.com \
--cc=akpm@linux-foundation.org \
--cc=david@kernel.org \
--cc=kvm@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-parisc@vger.kernel.org \
--cc=linux-riscv@lists.infradead.org \
--cc=linux-s390@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=ljs@kernel.org \
--cc=mhocko@suse.com \
--cc=rppt@kernel.org \
--cc=surenb@google.com \
--cc=vbabka@kernel.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox