+ mm-page_table_check-reinstate-address-parameter-in-page_table_check_pud_clear.patch added to mm-unstable branch

+ mm-page_table_check-reinstate-address-parameter-in-page_table_check_pud_clear.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/page_table_check: reinstate address parameter in [__]page_table_check_pud_clear()
has been added to the -mm mm-unstable branch.  Its filename is
     mm-page_table_check-reinstate-address-parameter-in-page_table_check_pud_clear.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_table_check-reinstate-address-parameter-in-page_table_check_pud_clear.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Rohan McLure <rmclure@linux.ibm.com>
Subject: mm/page_table_check: reinstate address parameter in [__]page_table_check_pud_clear()
Date: Wed, 12 Feb 2025 03:13:57 +1100

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.

Link: https://lkml.kernel.org/r/20250211161404.850215-5-ajd@linux.ibm.com
Signed-off-by: Rohan McLure <rmclure@linux.ibm.com>
Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
Cc: <x86@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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(-)

--- a/arch/x86/include/asm/pgtable.h~mm-page_table_check-reinstate-address-parameter-in-page_table_check_pud_clear
+++ a/arch/x86/include/asm/pgtable.h
@@ -1398,7 +1398,7 @@ static inline pud_t pudp_huge_get_and_cl
 {
 	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;
 }
--- a/include/linux/page_table_check.h~mm-page_table_check-reinstate-address-parameter-in-page_table_check_pud_clear
+++ a/include/linux/page_table_check.h
@@ -16,7 +16,8 @@ extern struct page_ext_operations page_t
 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_
 	__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_
 {
 }
 
-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)
 {
 }
 
--- a/include/linux/pgtable.h~mm-page_table_check-reinstate-address-parameter-in-page_table_check_pud_clear
+++ a/include/linux/pgtable.h
@@ -650,7 +650,7 @@ static inline pud_t pudp_huge_get_and_cl
 	pud_t pud = *pudp;
 
 	pud_clear(pudp);
-	page_table_check_pud_clear(mm, pud);
+	page_table_check_pud_clear(mm, address, pud);
 
 	return pud;
 }
--- a/mm/page_table_check.c~mm-page_table_check-reinstate-address-parameter-in-page_table_check_pud_clear
+++ a/mm/page_table_check.c
@@ -167,7 +167,8 @@ void __page_table_check_pmd_clear(struct
 }
 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;
@@ -240,7 +241,7 @@ void __page_table_check_pud_set(struct m
 	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));
_

Patches currently in -mm which might be from rmclure@linux.ibm.com are

mm-page_table_check-reinstate-address-parameter-in-page_table_check_pud_set.patch
mm-page_table_check-reinstate-address-parameter-in-page_table_check_pmd_set.patch
mm-page_table_check-provide-addr-parameter-to-page_table_check_pte_set.patch
mm-page_table_check-reinstate-address-parameter-in-page_table_check_pud_clear.patch
mm-page_table_check-reinstate-address-parameter-in-page_table_check_pmd_clear.patch
mm-page_table_check-reinstate-address-parameter-in-page_table_check_pte_clear.patch
mm-provide-address-parameter-to-ptemdud_user_accessible_page.patch
powerpc-mm-add-pud_pfn-stub.patch
powerpc-mm-implement-_user_accessible_page-for-ptes.patch
powerpc-mm-use-set_pte_at_unchecked-for-internal-usages.patch
powerpc-mm-support-page-table-check.patch