mm: change to return bool for ptep_clear_flush_young()/clear_flush_young_ptes()

The ptep_clear_flush_young() and clear_flush_young_ptes() are used to
clear the young flag and flush the TLB, returning whether the young flag
was set.  Change the return type to bool to make the intention clearer.

Link: https://lkml.kernel.org/r/24af5144b96103631594501f77d4525f2475c1be.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>
Acked-by: David Hildenbrand (Arm) <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>

11 files changed, 33 insertions, 34 deletions

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 79596cc05dcb..1009f719b157 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -1298,10 +1298,10 @@ static inline bool __ptep_test_and_clear_young(struct vm_area_struct *vma,
 	return pte_young(pte);
 }
 
-static inline int __ptep_clear_flush_young(struct vm_area_struct *vma,
-					 unsigned long address, pte_t *ptep)
+static inline bool __ptep_clear_flush_young(struct vm_area_struct *vma,
+		unsigned long address, pte_t *ptep)
 {
-	int young = __ptep_test_and_clear_young(vma, address, ptep);
+	bool young = __ptep_test_and_clear_young(vma, address, ptep);
 
 	if (young) {
 		/*
@@ -1647,7 +1647,7 @@ extern pte_t contpte_get_and_clear_full_ptes(struct mm_struct *mm,
 				unsigned int nr, int full);
 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,
+bool contpte_clear_flush_young_ptes(struct vm_area_struct *vma,
 				unsigned long addr, pte_t *ptep, unsigned int nr);
 extern void contpte_wrprotect_ptes(struct mm_struct *mm, unsigned long addr,
 				pte_t *ptep, unsigned int nr);
@@ -1829,8 +1829,8 @@ static inline bool ptep_test_and_clear_young(struct vm_area_struct *vma,
 }
 
 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
-static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
-				unsigned long addr, pte_t *ptep)
+static inline bool ptep_clear_flush_young(struct vm_area_struct *vma,
+		unsigned long addr, pte_t *ptep)
 {
 	pte_t orig_pte = __ptep_get(ptep);
 
@@ -1841,9 +1841,8 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
 }
 
 #define clear_flush_young_ptes clear_flush_young_ptes
-static inline int clear_flush_young_ptes(struct vm_area_struct *vma,
-					 unsigned long addr, pte_t *ptep,
-					 unsigned int nr)
+static inline bool clear_flush_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_clear_flush_young(vma, addr, ptep);
diff --git a/arch/arm64/mm/contpte.c b/arch/arm64/mm/contpte.c
index a31cae78f712..2dc1b8ad71e8 100644
--- a/arch/arm64/mm/contpte.c
+++ b/arch/arm64/mm/contpte.c
@@ -534,11 +534,10 @@ bool contpte_test_and_clear_young_ptes(struct vm_area_struct *vma,
 }
 EXPORT_SYMBOL_GPL(contpte_test_and_clear_young_ptes);
 
-int contpte_clear_flush_young_ptes(struct vm_area_struct *vma,
-				unsigned long addr, pte_t *ptep,
-				unsigned int nr)
+bool contpte_clear_flush_young_ptes(struct vm_area_struct *vma,
+		unsigned long addr, pte_t *ptep, unsigned int nr)
 {
-	int young;
+	bool young;
 
 	young = contpte_test_and_clear_young_ptes(vma, addr, ptep, nr);
 
diff --git a/arch/parisc/include/asm/pgtable.h b/arch/parisc/include/asm/pgtable.h
index 7097c785f690..467b8547ac8b 100644
--- a/arch/parisc/include/asm/pgtable.h
+++ b/arch/parisc/include/asm/pgtable.h
@@ -451,7 +451,7 @@ static inline bool ptep_test_and_clear_young(struct vm_area_struct *vma,
 	return true;
 }
 
-int ptep_clear_flush_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep);
+bool ptep_clear_flush_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep);
 pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep);
 
 struct mm_struct;
diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index b189265785dc..0170b69a21d3 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -781,18 +781,18 @@ void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned lon
 	__flush_cache_page(vma, vmaddr, PFN_PHYS(page_to_pfn(page)));
 }
 
-int ptep_clear_flush_young(struct vm_area_struct *vma, unsigned long addr,
-			   pte_t *ptep)
+bool ptep_clear_flush_young(struct vm_area_struct *vma,
+		unsigned long addr, pte_t *ptep)
 {
 	pte_t pte = ptep_get(ptep);
 
 	if (!pte_young(pte))
-		return 0;
+		return false;
 	set_pte(ptep, pte_mkold(pte));
 #if CONFIG_FLUSH_PAGE_ACCESSED
 	__flush_cache_page(vma, addr, PFN_PHYS(pte_pfn(pte)));
 #endif
-	return 1;
+	return true;
 }
 
 /*
diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h
index 2deb955b7bc8..661eb3820d12 100644
--- a/arch/powerpc/include/asm/nohash/64/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/64/pgtable.h
@@ -155,7 +155,7 @@ static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
 #define ptep_clear_flush_young(__vma, __address, __ptep)		\
 ({									\
-	int __young = ptep_test_and_clear_young(__vma, __address, __ptep);\
+	bool __young = ptep_test_and_clear_young(__vma, __address, __ptep);\
 	__young;							\
 })
 
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 643d12481b02..b9dacfc280b1 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -695,8 +695,8 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm,
 }
 
 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
-static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
-					 unsigned long address, pte_t *ptep)
+static inline bool ptep_clear_flush_young(struct vm_area_struct *vma,
+		unsigned long address, pte_t *ptep)
 {
 	/*
 	 * This comment is borrowed from x86, but applies equally to RISC-V:
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index ef4748ee3a2b..ac74b5076d8f 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1174,8 +1174,8 @@ static inline bool ptep_test_and_clear_young(struct vm_area_struct *vma,
 }
 
 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
-static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
-					 unsigned long address, pte_t *ptep)
+static inline bool ptep_clear_flush_young(struct vm_area_struct *vma,
+		unsigned long address, pte_t *ptep)
 {
 	return ptep_test_and_clear_young(vma, address, ptep);
 }
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 1d86fb33239f..3993657e0a35 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1236,8 +1236,8 @@ 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,
-				  unsigned long address, pte_t *ptep);
+bool ptep_clear_flush_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, unsigned long addr,
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index 5ee38dda9124..1348384a3bb9 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -483,8 +483,8 @@ int pudp_test_and_clear_young(struct vm_area_struct *vma,
 }
 #endif
 
-int ptep_clear_flush_young(struct vm_area_struct *vma,
-			   unsigned long address, pte_t *ptep)
+bool ptep_clear_flush_young(struct vm_area_struct *vma,
+		unsigned long address, pte_t *ptep)
 {
 	/*
 	 * On x86 CPUs, clearing the accessed bit without a TLB flush
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 8e75dc9f7932..99450a3b0705 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -531,8 +531,8 @@ static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
 #endif
 
 #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
-int ptep_clear_flush_young(struct vm_area_struct *vma,
-			   unsigned long address, pte_t *ptep);
+bool ptep_clear_flush_young(struct vm_area_struct *vma,
+		unsigned long address, pte_t *ptep);
 #endif
 
 #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
@@ -1086,10 +1086,10 @@ static inline void wrprotect_ptes(struct mm_struct *mm, unsigned long addr,
  * Context: The caller holds the page table lock.  The PTEs map consecutive
  * pages that belong to the same folio.  The PTEs are all in the same PMD.
  */
-static inline int clear_flush_young_ptes(struct vm_area_struct *vma,
+static inline bool clear_flush_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_clear_flush_young(vma, addr, ptep);
diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c
index af7966169d69..db0ee918b08a 100644
--- a/mm/pgtable-generic.c
+++ b/mm/pgtable-generic.c
@@ -81,10 +81,11 @@ int ptep_set_access_flags(struct vm_area_struct *vma,
 #endif
 
 #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
-int ptep_clear_flush_young(struct vm_area_struct *vma,
-			   unsigned long address, pte_t *ptep)
+bool ptep_clear_flush_young(struct vm_area_struct *vma,
+		unsigned long address, pte_t *ptep)
 {
-	int young;
+	bool young;
+
 	young = ptep_test_and_clear_young(vma, address, ptep);
 	if (young)
 		flush_tlb_page(vma, address);