+ mm-change-to-return-bool-for-pmdp_test_and_clear_young.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm: change to return bool for pmdp_test_and_clear_young()
has been added to the -mm mm-new branch.  Its filename is
     mm-change-to-return-bool-for-pmdp_test_and_clear_young.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-pmdp_test_and_clear_young.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 ***

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------------------------------------------------------
From: Baolin Wang <baolin.wang@linux.alibaba.com>
Subject: mm: change to return bool for pmdp_test_and_clear_young()
Date: Sat, 21 Mar 2026 14:42:51 +0800

Callers use pmdp_test_and_clear_young() to clear the young flag and check
whether it was set for this PMD entry.  Change the return type to bool to
make the intention clearer.

Link: https://lkml.kernel.org/r/f1d31307a13365d3d0fed5809727dcc2dd59631b.1774075004.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.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: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/arm64/include/asm/pgtable.h             |    5 +---
 arch/powerpc/include/asm/book3s/64/pgtable.h |   10 ++++----
 arch/powerpc/mm/book3s64/pgtable.c           |    4 +--
 arch/riscv/include/asm/pgtable.h             |    4 +--
 arch/s390/include/asm/pgtable.h              |    4 +--
 arch/x86/include/asm/pgtable.h               |    4 +--
 arch/x86/mm/pgtable.c                        |    6 ++---
 include/linux/pgtable.h                      |   19 ++++++++---------
 8 files changed, 27 insertions(+), 29 deletions(-)

--- a/arch/arm64/include/asm/pgtable.h~mm-change-to-return-bool-for-pmdp_test_and_clear_young
+++ a/arch/arm64/include/asm/pgtable.h
@@ -1320,9 +1320,8 @@ static inline bool __ptep_clear_flush_yo
 
 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG)
 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
-static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
-					    unsigned long address,
-					    pmd_t *pmdp)
+static inline bool pmdp_test_and_clear_young(struct vm_area_struct *vma,
+		unsigned long address, pmd_t *pmdp)
 {
 	/* Operation applies to PMD table entry only if FEAT_HAFT is enabled */
 	VM_WARN_ON(pmd_table(READ_ONCE(*pmdp)) && !system_supports_haft());
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h~mm-change-to-return-bool-for-pmdp_test_and_clear_young
+++ a/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -1161,13 +1161,13 @@ pud_hugepage_update(struct mm_struct *mm
  * For radix we should always find H_PAGE_HASHPTE zero. Hence
  * the below will work for radix too
  */
-static inline int __pmdp_test_and_clear_young(struct mm_struct *mm,
-					      unsigned long addr, pmd_t *pmdp)
+static inline bool __pmdp_test_and_clear_young(struct mm_struct *mm,
+		unsigned long addr, pmd_t *pmdp)
 {
 	unsigned long old;
 
 	if ((pmd_raw(*pmdp) & cpu_to_be64(_PAGE_ACCESSED | H_PAGE_HASHPTE)) == 0)
-		return 0;
+		return false;
 	old = pmd_hugepage_update(mm, addr, pmdp, _PAGE_ACCESSED, 0);
 	return ((old & _PAGE_ACCESSED) != 0);
 }
@@ -1300,8 +1300,8 @@ extern int pudp_set_access_flags(struct
 				 pud_t entry, int dirty);
 
 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
-extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
-				     unsigned long address, pmd_t *pmdp);
+bool pmdp_test_and_clear_young(struct vm_area_struct *vma,
+		unsigned long address, pmd_t *pmdp);
 #define __HAVE_ARCH_PUDP_TEST_AND_CLEAR_YOUNG
 extern int pudp_test_and_clear_young(struct vm_area_struct *vma,
 				     unsigned long address, pud_t *pudp);
--- a/arch/powerpc/mm/book3s64/pgtable.c~mm-change-to-return-bool-for-pmdp_test_and_clear_young
+++ a/arch/powerpc/mm/book3s64/pgtable.c
@@ -98,8 +98,8 @@ int pudp_set_access_flags(struct vm_area
 }
 
 
-int pmdp_test_and_clear_young(struct vm_area_struct *vma,
-			      unsigned long address, pmd_t *pmdp)
+bool pmdp_test_and_clear_young(struct vm_area_struct *vma,
+		unsigned long address, pmd_t *pmdp)
 {
 	return __pmdp_test_and_clear_young(vma->vm_mm, address, pmdp);
 }
--- a/arch/riscv/include/asm/pgtable.h~mm-change-to-return-bool-for-pmdp_test_and_clear_young
+++ a/arch/riscv/include/asm/pgtable.h
@@ -1015,8 +1015,8 @@ static inline int pmdp_set_access_flags(
 }
 
 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
-static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
-					unsigned long address, pmd_t *pmdp)
+static inline bool pmdp_test_and_clear_young(struct vm_area_struct *vma,
+		unsigned long address, pmd_t *pmdp)
 {
 	return ptep_test_and_clear_young(vma, address, (pte_t *)pmdp);
 }
--- a/arch/s390/include/asm/pgtable.h~mm-change-to-return-bool-for-pmdp_test_and_clear_young
+++ a/arch/s390/include/asm/pgtable.h
@@ -1683,8 +1683,8 @@ static inline int pmdp_set_access_flags(
 }
 
 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
-static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
-					    unsigned long addr, pmd_t *pmdp)
+static inline bool pmdp_test_and_clear_young(struct vm_area_struct *vma,
+		unsigned long addr, pmd_t *pmdp)
 {
 	pmd_t pmd = *pmdp;
 
--- a/arch/x86/include/asm/pgtable.h~mm-change-to-return-bool-for-pmdp_test_and_clear_young
+++ a/arch/x86/include/asm/pgtable.h
@@ -1295,8 +1295,8 @@ extern int pudp_set_access_flags(struct
 				 pud_t entry, int dirty);
 
 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
-extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
-				     unsigned long addr, pmd_t *pmdp);
+bool pmdp_test_and_clear_young(struct vm_area_struct *vma,
+		unsigned long addr, pmd_t *pmdp);
 extern int pudp_test_and_clear_young(struct vm_area_struct *vma,
 				     unsigned long addr, pud_t *pudp);
 
--- a/arch/x86/mm/pgtable.c~mm-change-to-return-bool-for-pmdp_test_and_clear_young
+++ a/arch/x86/mm/pgtable.c
@@ -456,10 +456,10 @@ bool ptep_test_and_clear_young(struct vm
 }
 
 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG)
-int pmdp_test_and_clear_young(struct vm_area_struct *vma,
-			      unsigned long addr, pmd_t *pmdp)
+bool pmdp_test_and_clear_young(struct vm_area_struct *vma,
+		unsigned long addr, pmd_t *pmdp)
 {
-	int ret = 0;
+	bool ret = false;
 
 	if (pmd_young(*pmdp))
 		ret = test_and_clear_bit(_PAGE_BIT_ACCESSED,
--- a/include/linux/pgtable.h~mm-change-to-return-bool-for-pmdp_test_and_clear_young
+++ a/include/linux/pgtable.h
@@ -507,25 +507,24 @@ static inline bool ptep_test_and_clear_y
 
 #ifndef __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG)
-static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
-					    unsigned long address,
-					    pmd_t *pmdp)
+static inline bool pmdp_test_and_clear_young(struct vm_area_struct *vma,
+		unsigned long address, pmd_t *pmdp)
 {
 	pmd_t pmd = *pmdp;
-	int r = 1;
+	bool young = true;
+
 	if (!pmd_young(pmd))
-		r = 0;
+		young = false;
 	else
 		set_pmd_at(vma->vm_mm, address, pmdp, pmd_mkold(pmd));
-	return r;
+	return young;
 }
 #else
-static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
-					    unsigned long address,
-					    pmd_t *pmdp)
+static inline bool pmdp_test_and_clear_young(struct vm_area_struct *vma,
+		unsigned long address, pmd_t *pmdp)
 {
 	BUILD_BUG();
-	return 0;
+	return false;
 }
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG */
 #endif
_

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