[PATCH v11 06/11] Revert "mm/page_table_check: remove unused parameter in [__]page_table_check_pte_clear"

Rohan McLure
2024-03-28T04:57:55Z

This reverts commit aa232204c4689427cefa55fe975692b57291523a.

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 | 4 ++--
include/linux/page_table_check.h | 11 +++++++----
include/linux/pgtable.h | 2 +-
mm/page_table_check.c | 7 ++++---
6 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index d20afcfae530..040c2e664cff 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -1145,7 +1145,7 @@ 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 0066626159a5..92bf5c309055 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -563,7 +563,7 @@ 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 9876e6d92799..b2b3902f8df4 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1276,7 +1276,7 @@ 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;
}

@@ -1292,7 +1292,7 @@ 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 d17fbca4da7b..7c18a1e55696 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -454,7 +454,7 @@ 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
diff --git a/mm/page_table_check.c b/mm/page_table_check.c
index 7afaad9c6e6f..98cccee74b02 100644
--- a/mm/page_table_check.c
+++ b/mm/page_table_check.c
@@ -149,7 +149,8 @@ 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;
@@ -193,7 +194,7 @@ void __page_table_check_ptes_set(struct mm_struct *mm, unsigned long addr,
return;

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));
}
@@ -241,7 +242,7 @@ 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++;