linux-kernel - [PATCH v13 04/11] mm/page_table_check: Reinstate address parameter in [__]page_table_check_pud

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Message-ID: <20250211161404.850215-5-ajd@linux.ibm.com>
Date: Wed, 12 Feb 2025 03:13:57 +1100
From: Andrew Donnellan <ajd@...ux.ibm.com>
To: linuxppc-dev@...ts.ozlabs.org
Cc: x86@...nel.org, linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        pasha.tatashin@...een.com, sweettea-kernel@...miny.me
Subject: [PATCH v13 04/11] mm/page_table_check: Reinstate address parameter in [__]page_table_check_pud_clear()

From: Rohan McLure <rmclure@...ux.ibm.com>

This reverts commit 931c38e16499 ("mm/page_table_check: remove unused
parameter in [__]page_table_check_pud_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@...ux.ibm.com>
Reviewed-by: Pasha Tatashin <pasha.tatashin@...een.com>
Signed-off-by: Andrew Donnellan <ajd@...ux.ibm.com>
---
 arch/x86/include/asm/pgtable.h   |  2 +-
 include/linux/page_table_check.h | 11 +++++++----
 include/linux/pgtable.h          |  2 +-
 mm/page_table_check.c            |  5 +++--
 4 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 366cdb9d75d9..5ec052ef07ff 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1398,7 +1398,7 @@ static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm,
 {
 	pud_t pud = native_pudp_get_and_clear(pudp);
 
-	page_table_check_pud_clear(mm, pud);
+	page_table_check_pud_clear(mm, addr, pud);
 
 	return pud;
 }
diff --git a/include/linux/page_table_check.h b/include/linux/page_table_check.h
index 9243c920ed02..d01a00ffc1f9 100644
--- a/include/linux/page_table_check.h
+++ b/include/linux/page_table_check.h
@@ -16,7 +16,8 @@ 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_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_pud_clear(struct mm_struct *mm, unsigned long addr,
+				  pud_t pud);
 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,
@@ -59,12 +60,13 @@ static inline void page_table_check_pmd_clear(struct mm_struct *mm, pmd_t pmd)
 	__page_table_check_pmd_clear(mm, pmd);
 }
 
-static inline void page_table_check_pud_clear(struct mm_struct *mm, pud_t pud)
+static inline void page_table_check_pud_clear(struct mm_struct *mm,
+					      unsigned long addr, pud_t pud)
 {
 	if (static_branch_likely(&page_table_check_disabled))
 		return;
 
-	__page_table_check_pud_clear(mm, pud);
+	__page_table_check_pud_clear(mm, addr, pud);
 }
 
 static inline void page_table_check_ptes_set(struct mm_struct *mm,
@@ -125,7 +127,8 @@ static inline void page_table_check_pmd_clear(struct mm_struct *mm, pmd_t pmd)
 {
 }
 
-static inline void page_table_check_pud_clear(struct mm_struct *mm, pud_t pud)
+static inline void page_table_check_pud_clear(struct mm_struct *mm,
+					      unsigned long addr, pud_t pud)
 {
 }
 
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 2b25dd17ec67..e41cf0622aa4 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -648,7 +648,7 @@ static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm,
 	pud_t pud = *pudp;
 
 	pud_clear(pudp);
-	page_table_check_pud_clear(mm, pud);
+	page_table_check_pud_clear(mm, address, pud);
 
 	return pud;
 }
diff --git a/mm/page_table_check.c b/mm/page_table_check.c
index 959e11e1af24..7c2f3f93e377 100644
--- a/mm/page_table_check.c
+++ b/mm/page_table_check.c
@@ -182,7 +182,8 @@ void __page_table_check_pmd_clear(struct mm_struct *mm, pmd_t pmd)
 }
 EXPORT_SYMBOL(__page_table_check_pmd_clear);
 
-void __page_table_check_pud_clear(struct mm_struct *mm, pud_t pud)
+void __page_table_check_pud_clear(struct mm_struct *mm, unsigned long addr,
+				  pud_t pud)
 {
 	if (&init_mm == mm)
 		return;
@@ -256,7 +257,7 @@ void __page_table_check_pud_set(struct mm_struct *mm, unsigned long addr,
 	if (&init_mm == mm)
 		return;
 
-	__page_table_check_pud_clear(mm, *pudp);
+	__page_table_check_pud_clear(mm, addr, *pudp);
 	if (pud_user_accessible_page(pud)) {
 		page_table_check_set(pud_pfn(pud), PUD_SIZE >> PAGE_SHIFT,
 				     pud_write(pud));
-- 
2.48.1