mm: convert page_table_check_pte_set() to page_table_check_ptes_set()

Tell the page table check how many PTEs & PFNs we want it to check.

Link: https://lkml.kernel.org/r/20230802151406.3735276-3-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
Acked-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/arm64/include/asm/pgtable.h

@@ -348,7 +348,7 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 			      pte_t *ptep, pte_t pte)
 {
-	page_table_check_pte_set(mm, ptep, pte);
+	page_table_check_ptes_set(mm, ptep, pte, 1);
 	return __set_pte_at(mm, addr, ptep, pte);
 }
 

arch/riscv/include/asm/pgtable.h

@@ -499,7 +499,7 @@ static inline void __set_pte_at(struct mm_struct *mm,
 static inline void set_pte_at(struct mm_struct *mm,
 	unsigned long addr, pte_t *ptep, pte_t pteval)
 {
-	page_table_check_pte_set(mm, ptep, pteval);
+	page_table_check_ptes_set(mm, ptep, pteval, 1);
 	__set_pte_at(mm, addr, ptep, pteval);
 }
 

arch/x86/include/asm/pgtable.h

@@ -1023,7 +1023,7 @@ static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp)
 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 			      pte_t *ptep, pte_t pte)
 {
-	page_table_check_pte_set(mm, ptep, pte);
+	page_table_check_ptes_set(mm, ptep, pte, 1);
 	set_pte(ptep, pte);
 }
 

include/linux/page_table_check.h

@@ -17,7 +17,8 @@ void __page_table_check_zero(struct page *page, unsigned int order);
 void __page_table_check_pte_clear(struct mm_struct *mm, pte_t pte);
 void __page_table_check_pmd_clear(struct mm_struct *mm, pmd_t pmd);
 void __page_table_check_pud_clear(struct mm_struct *mm, pud_t pud);
-void __page_table_check_pte_set(struct mm_struct *mm, pte_t *ptep, pte_t pte);
+void __page_table_check_ptes_set(struct mm_struct *mm, pte_t *ptep, pte_t pte,
+		unsigned int nr);
 void __page_table_check_pmd_set(struct mm_struct *mm, pmd_t *pmdp, pmd_t pmd);
 void __page_table_check_pud_set(struct mm_struct *mm, pud_t *pudp, pud_t pud);
 void __page_table_check_pte_clear_range(struct mm_struct *mm,
@@ -64,13 +65,13 @@ static inline void page_table_check_pud_clear(struct mm_struct *mm, pud_t pud)
 	__page_table_check_pud_clear(mm, pud);
 }
 
-static inline void page_table_check_pte_set(struct mm_struct *mm, pte_t *ptep,
-					    pte_t pte)
+static inline void page_table_check_ptes_set(struct mm_struct *mm,
+		pte_t *ptep, pte_t pte, unsigned int nr)
 {
 	if (static_branch_likely(&page_table_check_disabled))
 		return;
 
-	__page_table_check_pte_set(mm, ptep, pte);
+	__page_table_check_ptes_set(mm, ptep, pte, nr);
 }
 
 static inline void page_table_check_pmd_set(struct mm_struct *mm, pmd_t *pmdp,
@@ -123,8 +124,8 @@ static inline void page_table_check_pud_clear(struct mm_struct *mm, pud_t pud)
 {
 }
 
-static inline void page_table_check_pte_set(struct mm_struct *mm, pte_t *ptep,
-					    pte_t pte)
+static inline void page_table_check_ptes_set(struct mm_struct *mm,
+		pte_t *ptep, pte_t pte, unsigned int nr)
 {
 }
 

mm/page_table_check.c

@@ -182,18 +182,20 @@ void __page_table_check_pud_clear(struct mm_struct *mm, pud_t pud)
 }
 EXPORT_SYMBOL(__page_table_check_pud_clear);
 
-void __page_table_check_pte_set(struct mm_struct *mm, pte_t *ptep, pte_t pte)
+void __page_table_check_ptes_set(struct mm_struct *mm, pte_t *ptep, pte_t pte,
+		unsigned int nr)
 {
+	unsigned int i;
+
 	if (&init_mm == mm)
 		return;
 
-	__page_table_check_pte_clear(mm, ptep_get(ptep));
-	if (pte_user_accessible_page(pte)) {
-		page_table_check_set(pte_pfn(pte), PAGE_SIZE >> PAGE_SHIFT,
-				     pte_write(pte));
-	}
+	for (i = 0; i < nr; i++)
+		__page_table_check_pte_clear(mm, ptep_get(ptep + i));
+	if (pte_user_accessible_page(pte))
+		page_table_check_set(pte_pfn(pte), nr, pte_write(pte));
 }
-EXPORT_SYMBOL(__page_table_check_pte_set);
+EXPORT_SYMBOL(__page_table_check_ptes_set);
 
 void __page_table_check_pmd_set(struct mm_struct *mm, pmd_t *pmdp, pmd_t pmd)
 {