[v12,3/4] x86/mm: implement arch_faults_on_old_pte() stub on x86
diff mbox series

Message ID 20191011140939.6115-4-justin.he@arm.com
State In Next
Commit f2c4e5970cece75a895fcc45f0cd66b5a5ec0819
Headers show
  • fix double page fault in cow_user_page for pfn mapping
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Commit Message

Jia He Oct. 11, 2019, 2:09 p.m. UTC
arch_faults_on_old_pte is a helper to indicate that it might cause page
fault when accessing old pte. But on x86, there is feature to setting
pte access flag by hardware. Hence implement an overriding stub which
always returns false.

Signed-off-by: Jia He <justin.he@arm.com>
Suggested-by: Will Deacon <will@kernel.org>
 arch/x86/include/asm/pgtable.h | 6 ++++++
 1 file changed, 6 insertions(+)

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diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 0bc530c4eb13..ad97dc155195 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1463,6 +1463,12 @@  static inline bool arch_has_pfn_modify_check(void)
 	return boot_cpu_has_bug(X86_BUG_L1TF);
+#define arch_faults_on_old_pte arch_faults_on_old_pte
+static inline bool arch_faults_on_old_pte(void)
+	return false;
 #include <asm-generic/pgtable.h>
 #endif	/* __ASSEMBLY__ */