[PATCH v2 01/30] mm: Convert page_table_check_pte_set() to page_table_check_ptes_set()

["Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>]

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

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 arch/arm64/include/asm/pgtable.h |  2 +-
 arch/riscv/include/asm/pgtable.h |  2 +-
 arch/x86/include/asm/pgtable.h   |  2 +-
 include/linux/page_table_check.h | 14 +++++++-------
 mm/page_table_check.c            | 14 ++++++++------
 5 files changed, 18 insertions(+), 16 deletions(-)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index b6ba466e2e8a..69765dc697af 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -358,7 +358,7 @@ 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, addr, ptep, pte);
+	page_table_check_ptes_set(mm, addr, ptep, pte, 1);
 	return __set_pte_at(mm, addr, ptep, pte);
 }
 
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index ab05f892d317..b516f3b59616 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -459,7 +459,7 @@ 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, addr, ptep, pteval);
+	page_table_check_ptes_set(mm, addr, ptep, pteval, 1);
 	__set_pte_at(mm, addr, ptep, pteval);
 }
 
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 7425f32e5293..84be3e07b112 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1022,7 +1022,7 @@ 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, addr, ptep, pte);
+	page_table_check_ptes_set(mm, addr, ptep, pte, 1);
 	set_pte(ptep, pte);
 }
 
diff --git a/include/linux/page_table_check.h b/include/linux/page_table_check.h
index 01e16c7696ec..ba269c7009e4 100644
--- a/include/linux/page_table_check.h
+++ b/include/linux/page_table_check.h
@@ -20,8 +20,8 @@ void __page_table_check_pmd_clear(struct mm_struct *mm, unsigned long addr,
 				  pmd_t pmd);
 void __page_table_check_pud_clear(struct mm_struct *mm, unsigned long addr,
 				  pud_t pud);
-void __page_table_check_pte_set(struct mm_struct *mm, unsigned long addr,
-				pte_t *ptep, pte_t pte);
+void __page_table_check_ptes_set(struct mm_struct *mm, unsigned long addr,
+				pte_t *ptep, pte_t pte, unsigned int nr);
 void __page_table_check_pmd_set(struct mm_struct *mm, unsigned long addr,
 				pmd_t *pmdp, pmd_t pmd);
 void __page_table_check_pud_set(struct mm_struct *mm, unsigned long addr,
@@ -73,14 +73,14 @@ static inline void page_table_check_pud_clear(struct mm_struct *mm,
 	__page_table_check_pud_clear(mm, addr, pud);
 }
 
-static inline void page_table_check_pte_set(struct mm_struct *mm,
+static inline void page_table_check_ptes_set(struct mm_struct *mm,
 					    unsigned long addr, pte_t *ptep,
-					    pte_t pte)
+					    pte_t pte, unsigned int nr)
 {
 	if (static_branch_likely(&page_table_check_disabled))
 		return;
 
-	__page_table_check_pte_set(mm, addr, ptep, pte);
+	__page_table_check_ptes_set(mm, addr, ptep, pte, nr);
 }
 
 static inline void page_table_check_pmd_set(struct mm_struct *mm,
@@ -138,9 +138,9 @@ static inline void page_table_check_pud_clear(struct mm_struct *mm,
 {
 }
 
-static inline void page_table_check_pte_set(struct mm_struct *mm,
+static inline void page_table_check_ptes_set(struct mm_struct *mm,
 					    unsigned long addr, pte_t *ptep,
-					    pte_t pte)
+					    pte_t pte, unsigned int nr)
 {
 }
 
diff --git a/mm/page_table_check.c b/mm/page_table_check.c
index 25d8610c0042..e6f4d40caaa2 100644
--- a/mm/page_table_check.c
+++ b/mm/page_table_check.c
@@ -184,20 +184,22 @@ void __page_table_check_pud_clear(struct mm_struct *mm, unsigned long addr,
 }
 EXPORT_SYMBOL(__page_table_check_pud_clear);
 
-void __page_table_check_pte_set(struct mm_struct *mm, unsigned long addr,
-				pte_t *ptep, pte_t pte)
+void __page_table_check_ptes_set(struct mm_struct *mm, unsigned long addr,
+				pte_t *ptep, pte_t pte, unsigned int nr)
 {
+	unsigned int i;
+
 	if (&init_mm == mm)
 		return;
 
-	__page_table_check_pte_clear(mm, addr, *ptep);
+	for (i = 0; i < nr; i++)
+		__page_table_check_pte_clear(mm, addr, ptep[i]);
 	if (pte_user_accessible_page(pte)) {
-		page_table_check_set(mm, addr, pte_pfn(pte),
-				     PAGE_SIZE >> PAGE_SHIFT,
+		page_table_check_set(mm, addr, 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, unsigned long addr,
 				pmd_t *pmdp, pmd_t pmd)
-- 
2.39.1