[-next,v3,1/4] mm: page_table_check: move pxx_user_accessible_page into x86

Commit Message

Tong Tiangen March 28, 2022, 1:52 a.m. UTC

From: Kefeng Wang <[e-mail]>

The pxx_user_accessible_page() check the PTE bit, it's
architecture-specific code, move them into x86's pgtable.h,
also add default PMD/PUD_PAGE_SIZE definition, it's prepare
for support page table check feature on new architecture.

Signed-off-by: Kefeng Wang <[e-mail]>
Acked-by: Pasha Tatashin <[e-mail]>
---
 arch/x86/include/asm/pgtable.h | 19 +++++++++++++++++++
 mm/page_table_check.c          | 25 ++++++++-----------------
 2 files changed, 27 insertions(+), 17 deletions(-)

Patch

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 62ab07e24aef..8cd6514e3052 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1430,6 +1430,25 @@  static inline bool arch_faults_on_old_pte(void)
 	return false;
 }
 
+#ifdef CONFIG_PAGE_TABLE_CHECK
+static inline bool pte_user_accessible_page(pte_t pte)
+{
+	return (pte_val(pte) & _PAGE_PRESENT) && (pte_val(pte) & _PAGE_USER);
+}
+
+static inline bool pmd_user_accessible_page(pmd_t pmd)
+{
+	return pmd_leaf(pmd) && (pmd_val(pmd) & _PAGE_PRESENT) &&
+		(pmd_val(pmd) & _PAGE_USER);
+}
+
+static inline bool pud_user_accessible_page(pud_t pud)
+{
+	return pud_leaf(pud) && (pud_val(pud) & _PAGE_PRESENT) &&
+		(pud_val(pud) & _PAGE_USER);
+}
+#endif
+
 #endif	/* __ASSEMBLY__ */
 
 #endif /* _ASM_X86_PGTABLE_H */
diff --git a/mm/page_table_check.c b/mm/page_table_check.c
index 2458281bff89..145f059d1c4d 100644
--- a/mm/page_table_check.c
+++ b/mm/page_table_check.c
@@ -10,6 +10,14 @@ 
 #undef pr_fmt
 #define pr_fmt(fmt)	"page_table_check: " fmt
 
+#ifndef PMD_PAGE_SIZE
+#define PMD_PAGE_SIZE	PMD_SIZE
+#endif
+
+#ifndef PUD_PAGE_SIZE
+#define PUD_PAGE_SIZE	PUD_SIZE
+#endif
+
 struct page_table_check {
 	atomic_t anon_map_count;
 	atomic_t file_map_count;
@@ -52,23 +60,6 @@  static struct page_table_check *get_page_table_check(struct page_ext *page_ext)
 	return (void *)(page_ext) + page_table_check_ops.offset;
 }
 
-static inline bool pte_user_accessible_page(pte_t pte)
-{
-	return (pte_val(pte) & _PAGE_PRESENT) && (pte_val(pte) & _PAGE_USER);
-}
-
-static inline bool pmd_user_accessible_page(pmd_t pmd)
-{
-	return pmd_leaf(pmd) && (pmd_val(pmd) & _PAGE_PRESENT) &&
-		(pmd_val(pmd) & _PAGE_USER);
-}
-
-static inline bool pud_user_accessible_page(pud_t pud)
-{
-	return pud_leaf(pud) && (pud_val(pud) & _PAGE_PRESENT) &&
-		(pud_val(pud) & _PAGE_USER);
-}
-
 /*
  * An enty is removed from the page table, decrement the counters for that page
  * verify that it is of correct type and counters do not become negative.