[PATCH v11 05/11] Revert "mm/page_table_check: remove unused parameter in [__]page_table_check_pmd_clear"

Rohan McLure
2024-03-28T04:57:45Z

This reverts commit 1831414cd729a34af937d56ad684a66599de6344.

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>
---
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 | 11 +++++++----
include/linux/pgtable.h | 2 +-
mm/page_table_check.c | 5 +++--
6 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index b3938f80a1b6..d20afcfae530 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -1188,7 +1188,7 @@ static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
{
pmd_t pmd = __pmd(xchg_relaxed(&pmd_val(*pmdp), 0));

- page_table_check_pmd_clear(mm, pmd);
+ page_table_check_pmd_clear(mm, address, pmd);

return pmd;
}
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index a153d3d143d2..0066626159a5 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -767,7 +767,7 @@ static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
{
pmd_t pmd = __pmd(atomic_long_xchg((atomic_long_t *)pmdp, 0));

- page_table_check_pmd_clear(mm, pmd);
+ page_table_check_pmd_clear(mm, address, pmd);

return pmd;
}
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index e35b2b4f5ea1..9876e6d92799 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1345,7 +1345,7 @@ static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long
{
pmd_t pmd = native_pmdp_get_and_clear(pmdp);

- page_table_check_pmd_clear(mm, pmd);
+ page_table_check_pmd_clear(mm, addr, pmd);

return pmd;
}
diff --git a/include/linux/page_table_check.h b/include/linux/page_table_check.h
index d01a00ffc1f9..0a6ebfa46a31 100644
--- a/include/linux/page_table_check.h
+++ b/include/linux/page_table_check.h
@@ -15,7 +15,8 @@ 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_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_ptes_set(struct mm_struct *mm, unsigned long addr,
@@ -52,12 +53,13 @@ static inline void page_table_check_pte_clear(struct mm_struct *mm, pte_t pte)
__page_table_check_pte_clear(mm, pte);
}

-static inline void page_table_check_pmd_clear(struct mm_struct *mm, pmd_t pmd)
+static inline void page_table_check_pmd_clear(struct mm_struct *mm,
+ unsigned long addr, pmd_t pmd)
{
if (static_branch_likely(&page_table_check_disabled))
return;

- __page_table_check_pmd_clear(mm, pmd);
+ __page_table_check_pmd_clear(mm, addr, pmd);
}

static inline void page_table_check_pud_clear(struct mm_struct *mm,
@@ -123,7 +125,8 @@ static inline void page_table_check_pte_clear(struct mm_struct *mm, pte_t pte)
{
}

-static inline void page_table_check_pmd_clear(struct mm_struct *mm, pmd_t pmd)
+static inline void page_table_check_pmd_clear(struct mm_struct *mm,
+ unsigned long addr, pmd_t pmd)
{
}

diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 6a5c44c2208e..d17fbca4da7b 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -557,7 +557,7 @@ static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
pmd_t pmd = *pmdp;

pmd_clear(pmdp);
- page_table_check_pmd_clear(mm, pmd);
+ page_table_check_pmd_clear(mm, address, pmd);

return pmd;
}
diff --git a/mm/page_table_check.c b/mm/page_table_check.c
index a8c8fd7f06f8..7afaad9c6e6f 100644
--- a/mm/page_table_check.c
+++ b/mm/page_table_check.c
@@ -160,7 +160,8 @@ void __page_table_check_pte_clear(struct mm_struct *mm, pte_t pte)
}
EXPORT_SYMBOL(__page_table_check_pte_clear);

-void __page_table_check_pmd_clear(struct mm_struct *mm, pmd_t pmd)
+void __page_table_check_pmd_clear(struct mm_struct *mm, unsigned long addr,
+ pmd_t pmd)
{
if (&init_mm == mm)
return;
@@ -204,7 +205,7 @@ void __page_table_check_pmd_set(struct mm_struct *mm, unsigned long addr,
if (&init_mm == mm)
return;

- __page_table_check_pmd_clear(mm, *pmdp);
+ __page_table_check_pmd_clear(mm, addr, *pmdp);
if (pmd_user_accessible_page(pmd)) {
page_table_check_set(pmd_pfn(pmd), PMD_SIZE >> PAGE_SHIFT,
pmd_write(pmd));