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Message-ID: <20250625063753.77511-5-ajd@linux.ibm.com>
Date: Wed, 25 Jun 2025 16:37:44 +1000
From: Andrew Donnellan <ajd@...ux.ibm.com>
To: linuxppc-dev@...ts.ozlabs.org, pasha.tatashin@...een.com,
akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org, x86@...nel.org,
linux-riscv@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
linux-mm@...ck.org, sweettea-kernel@...miny.me,
christophe.leroy@...roup.eu, mingo@...nel.org
Subject: [PATCH v15 04/13] mm/page_table_check: Reinstate address parameter in [__]page_table_check_pmd[s]_set()
From: Rohan McLure <rmclure@...ux.ibm.com>
This reverts commit a3b837130b58 ("mm/page_table_check: remove unused
parameter in [__]page_table_check_pmd_set").
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.
Apply this to __page_table_check_pmds_set(), page_table_check_pmd_set(), and
the page_table_check_pmd_set() wrapper macro.
[ajd@...ux.ibm.com: rebase on arm64 + riscv changes, update commit message]
Signed-off-by: Rohan McLure <rmclure@...ux.ibm.com>
Reviewed-by: Pasha Tatashin <pasha.tatashin@...een.com>
Acked-by: Ingo Molnar <mingo@...nel.org> # x86
Signed-off-by: Andrew Donnellan <ajd@...ux.ibm.com>
---
v13: remove inaccurate comment on riscv in the commit message
v14: rebase
v15: rebase, amend commit message
---
arch/arm64/include/asm/pgtable.h | 5 +++--
arch/riscv/include/asm/pgtable.h | 4 ++--
arch/x86/include/asm/pgtable.h | 4 ++--
include/linux/page_table_check.h | 12 ++++++------
mm/page_table_check.c | 4 ++--
5 files changed, 15 insertions(+), 14 deletions(-)
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index be463058207c..0d34157106ee 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -723,7 +723,8 @@ static inline void __set_ptes_anysz(struct mm_struct *mm, unsigned long addr,
page_table_check_ptes_set(mm, ptep, pte, nr);
break;
case PMD_SIZE:
- page_table_check_pmds_set(mm, (pmd_t *)ptep, pte_pmd(pte), nr);
+ page_table_check_pmds_set(mm, addr, (pmd_t *)ptep,
+ pte_pmd(pte), nr);
break;
#ifndef __PAGETABLE_PMD_FOLDED
case PUD_SIZE:
@@ -1538,7 +1539,7 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm,
static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp, pmd_t pmd)
{
- page_table_check_pmd_set(vma->vm_mm, pmdp, pmd);
+ page_table_check_pmd_set(vma->vm_mm, address, pmdp, pmd);
return __pmd(xchg_relaxed(&pmd_val(*pmdp), pmd_val(pmd)));
}
#endif
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 8142b7c48295..62778ccdcf52 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -822,7 +822,7 @@ static inline pud_t pud_mkspecial(pud_t pud)
static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp, pmd_t pmd)
{
- page_table_check_pmd_set(mm, pmdp, pmd);
+ page_table_check_pmd_set(mm, addr, pmdp, pmd);
return __set_pte_at(mm, (pte_t *)pmdp, pmd_pte(pmd));
}
@@ -893,7 +893,7 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm,
static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp, pmd_t pmd)
{
- page_table_check_pmd_set(vma->vm_mm, pmdp, pmd);
+ page_table_check_pmd_set(vma->vm_mm, address, pmdp, pmd);
return __pmd(atomic_long_xchg((atomic_long_t *)pmdp, pmd_val(pmd)));
}
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index ab10efb392d1..995ca7e6e0e9 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1260,7 +1260,7 @@ static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp)
static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp, pmd_t pmd)
{
- page_table_check_pmd_set(mm, pmdp, pmd);
+ page_table_check_pmd_set(mm, addr, pmdp, pmd);
set_pmd(pmdp, pmd);
}
@@ -1403,7 +1403,7 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm,
static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp, pmd_t pmd)
{
- page_table_check_pmd_set(vma->vm_mm, pmdp, pmd);
+ page_table_check_pmd_set(vma->vm_mm, address, pmdp, pmd);
if (IS_ENABLED(CONFIG_SMP)) {
return xchg(pmdp, pmd);
} else {
diff --git a/include/linux/page_table_check.h b/include/linux/page_table_check.h
index 0bf18b884a12..cf7c28d8d468 100644
--- a/include/linux/page_table_check.h
+++ b/include/linux/page_table_check.h
@@ -19,8 +19,8 @@ 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_ptes_set(struct mm_struct *mm, pte_t *ptep, pte_t pte,
unsigned int nr);
-void __page_table_check_pmds_set(struct mm_struct *mm, pmd_t *pmdp, pmd_t pmd,
- unsigned int nr);
+void __page_table_check_pmds_set(struct mm_struct *mm, unsigned long addr,
+ pmd_t *pmdp, pmd_t pmd, unsigned int nr);
void __page_table_check_puds_set(struct mm_struct *mm, unsigned long addr,
pud_t *pudp, pud_t pud, unsigned int nr);
void __page_table_check_pte_clear_range(struct mm_struct *mm,
@@ -77,12 +77,12 @@ static inline void page_table_check_ptes_set(struct mm_struct *mm,
}
static inline void page_table_check_pmds_set(struct mm_struct *mm,
- pmd_t *pmdp, pmd_t pmd, unsigned int nr)
+ unsigned long addr, pmd_t *pmdp, pmd_t pmd, unsigned int nr)
{
if (static_branch_likely(&page_table_check_disabled))
return;
- __page_table_check_pmds_set(mm, pmdp, pmd, nr);
+ __page_table_check_pmds_set(mm, addr, pmdp, pmd, nr);
}
static inline void page_table_check_puds_set(struct mm_struct *mm,
@@ -132,7 +132,7 @@ static inline void page_table_check_ptes_set(struct mm_struct *mm,
}
static inline void page_table_check_pmds_set(struct mm_struct *mm,
- pmd_t *pmdp, pmd_t pmd, unsigned int nr)
+ unsigned long addr, pmd_t *pmdp, pmd_t pmd, unsigned int nr)
{
}
@@ -149,7 +149,7 @@ static inline void page_table_check_pte_clear_range(struct mm_struct *mm,
#endif /* CONFIG_PAGE_TABLE_CHECK */
-#define page_table_check_pmd_set(mm, pmdp, pmd) page_table_check_pmds_set(mm, pmdp, pmd, 1)
+#define page_table_check_pmd_set(mm, addr, pmdp, pmd) page_table_check_pmds_set(mm, addr, pmdp, pmd, 1)
#define page_table_check_pud_set(mm, addr, pudp, pud) page_table_check_puds_set(mm, addr, pudp, pud, 1)
#endif /* __LINUX_PAGE_TABLE_CHECK_H */
diff --git a/mm/page_table_check.c b/mm/page_table_check.c
index 3c39e4375886..09258f2ad93f 100644
--- a/mm/page_table_check.c
+++ b/mm/page_table_check.c
@@ -218,8 +218,8 @@ static inline void page_table_check_pmd_flags(pmd_t pmd)
WARN_ON_ONCE(swap_cached_writable(pmd_to_swp_entry(pmd)));
}
-void __page_table_check_pmds_set(struct mm_struct *mm, pmd_t *pmdp, pmd_t pmd,
- unsigned int nr)
+void __page_table_check_pmds_set(struct mm_struct *mm, unsigned long addr,
+ pmd_t *pmdp, pmd_t pmd, unsigned int nr)
{
unsigned long stride = PMD_SIZE >> PAGE_SHIFT;
unsigned int i;
--
2.49.0
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