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-rw-r--r--arch/arm64/include/asm/pgtable.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 46472a91b6df..e20bd431184a 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -224,6 +224,23 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
set_pte(ptep, pte);
}
+#define __HAVE_ARCH_PTE_SAME
+static inline int pte_same(pte_t pte_a, pte_t pte_b)
+{
+ pteval_t lhs, rhs;
+
+ lhs = pte_val(pte_a);
+ rhs = pte_val(pte_b);
+
+ if (pte_present(pte_a))
+ lhs &= ~PTE_RDONLY;
+
+ if (pte_present(pte_b))
+ rhs &= ~PTE_RDONLY;
+
+ return (lhs == rhs);
+}
+
/*
* Huge pte definitions.
*/