diff mbox series

[v11,3/4] x86/mm: implement arch_faults_on_old_pte() stub on x86

Message ID 20191009084246.123354-4-justin.he@arm.com (mailing list archive)
State New, archived
Headers show
Series fix double page fault in cow_user_page for pfn mapping | expand

Commit Message

Jia He Oct. 9, 2019, 8:42 a.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(+)
diff mbox series

Patch

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__ */