diff mbox series

[v13,06/11] mm/page_table_check: Reinstate address parameter in [__]page_table_check_pte_clear()

Message ID 20250211161404.850215-7-ajd@linux.ibm.com (mailing list archive)
State New
Headers show
Series Support page table check on PowerPC | expand

Commit Message

Andrew Donnellan Feb. 11, 2025, 4:13 p.m. UTC 
From: Rohan McLure <rmclure@linux.ibm.com>

This reverts commit aa232204c468 ("mm/page_table_check: remove unused
parameter in [__]page_table_check_pte_clear").

Reinstate previously unused parameters for the purpose of supporting
powerpc platforms, as many do not encode user/kernel ownership of the
page in the pte, but instead in the address of the access.

Signed-off-by: Rohan McLure <rmclure@linux.ibm.com>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
[ajd: rebase and fix additional occurrence]
Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com>
---
v13: fix an additional occurrence
---
 arch/arm64/include/asm/pgtable.h |  2 +-
 arch/riscv/include/asm/pgtable.h |  2 +-
 arch/x86/include/asm/pgtable.h   |  4 ++--
 include/linux/page_table_check.h | 11 +++++++----
 include/linux/pgtable.h          |  4 ++--
 mm/page_table_check.c            |  7 ++++---
 6 files changed, 17 insertions(+), 13 deletions(-)
diff mbox series

Patch

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 58108086f962..f9effb5ddf1a 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -1281,7 +1281,7 @@  static inline pte_t __ptep_get_and_clear(struct mm_struct *mm,
 {
 	pte_t pte = __pte(xchg_relaxed(&pte_val(*ptep), 0));
 
-	page_table_check_pte_clear(mm, pte);
+	page_table_check_pte_clear(mm, address, pte);
 
 	return pte;
 }
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 8cb0d5e2ee47..c8d59feb4963 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -593,7 +593,7 @@  static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
 {
 	pte_t pte = __pte(atomic_long_xchg((atomic_long_t *)ptep, 0));
 
-	page_table_check_pte_clear(mm, pte);
+	page_table_check_pte_clear(mm, address, pte);
 
 	return pte;
 }
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 9027467bbde7..dbb376400ac7 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1318,7 +1318,7 @@  static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
 				       pte_t *ptep)
 {
 	pte_t pte = native_ptep_get_and_clear(ptep);
-	page_table_check_pte_clear(mm, pte);
+	page_table_check_pte_clear(mm, addr, pte);
 	return pte;
 }
 
@@ -1334,7 +1334,7 @@  static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
 		 * care about updates and native needs no locking
 		 */
 		pte = native_local_ptep_get_and_clear(ptep);
-		page_table_check_pte_clear(mm, pte);
+		page_table_check_pte_clear(mm, addr, pte);
 	} else {
 		pte = ptep_get_and_clear(mm, addr, ptep);
 	}
diff --git a/include/linux/page_table_check.h b/include/linux/page_table_check.h
index 0a6ebfa46a31..48721a4a2b84 100644
--- a/include/linux/page_table_check.h
+++ b/include/linux/page_table_check.h
@@ -14,7 +14,8 @@  extern struct static_key_true page_table_check_disabled;
 extern struct page_ext_operations page_table_check_ops;
 
 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_pte_clear(struct mm_struct *mm, unsigned long addr,
+				  pte_t pte);
 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,
@@ -45,12 +46,13 @@  static inline void page_table_check_free(struct page *page, unsigned int order)
 	__page_table_check_zero(page, order);
 }
 
-static inline void page_table_check_pte_clear(struct mm_struct *mm, pte_t pte)
+static inline void page_table_check_pte_clear(struct mm_struct *mm,
+					      unsigned long addr, pte_t pte)
 {
 	if (static_branch_likely(&page_table_check_disabled))
 		return;
 
-	__page_table_check_pte_clear(mm, pte);
+	__page_table_check_pte_clear(mm, addr, pte);
 }
 
 static inline void page_table_check_pmd_clear(struct mm_struct *mm,
@@ -121,7 +123,8 @@  static inline void page_table_check_free(struct page *page, unsigned int order)
 {
 }
 
-static inline void page_table_check_pte_clear(struct mm_struct *mm, pte_t pte)
+static inline void page_table_check_pte_clear(struct mm_struct *mm,
+					      unsigned long addr, pte_t pte)
 {
 }
 
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index d34d0ec2d676..111c507c2c53 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -481,7 +481,7 @@  static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
 {
 	pte_t pte = ptep_get(ptep);
 	pte_clear(mm, address, ptep);
-	page_table_check_pte_clear(mm, pte);
+	page_table_check_pte_clear(mm, address, pte);
 	return pte;
 }
 #endif
@@ -540,7 +540,7 @@  static inline void ptep_clear(struct mm_struct *mm, unsigned long addr,
 	 * No need for ptep_get_and_clear(): page table check doesn't care about
 	 * any bits that could have been set by HW concurrently.
 	 */
-	page_table_check_pte_clear(mm, pte);
+	page_table_check_pte_clear(mm, addr, pte);
 }
 
 #ifdef CONFIG_GUP_GET_PXX_LOW_HIGH
diff --git a/mm/page_table_check.c b/mm/page_table_check.c
index 12781847bec7..4cb3e9ae57ff 100644
--- a/mm/page_table_check.c
+++ b/mm/page_table_check.c
@@ -160,7 +160,8 @@  void __page_table_check_zero(struct page *page, unsigned int order)
 	page_ext_put(page_ext);
 }
 
-void __page_table_check_pte_clear(struct mm_struct *mm, pte_t pte)
+void __page_table_check_pte_clear(struct mm_struct *mm, unsigned long addr,
+				  pte_t pte)
 {
 	if (&init_mm == mm)
 		return;
@@ -222,7 +223,7 @@  void __page_table_check_ptes_set(struct mm_struct *mm, unsigned long addr,
 	page_table_check_pte_flags(pte);
 
 	for (i = 0; i < nr; i++)
-		__page_table_check_pte_clear(mm, ptep_get(ptep + i));
+		__page_table_check_pte_clear(mm, addr, ptep_get(ptep + i));
 	if (pte_user_accessible_page(pte))
 		page_table_check_set(pte_pfn(pte), nr, pte_write(pte));
 }
@@ -280,7 +281,7 @@  void __page_table_check_pte_clear_range(struct mm_struct *mm,
 		if (WARN_ON(!ptep))
 			return;
 		for (i = 0; i < PTRS_PER_PTE; i++) {
-			__page_table_check_pte_clear(mm, ptep_get(ptep));
+			__page_table_check_pte_clear(mm, addr, ptep_get(ptep));
 			addr += PAGE_SIZE;
 			ptep++;
 		}