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UPSTREAM: x86/mm: implement arch_faults_on_old_pte() stub on x86

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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.
Moto-CRs-Fixed:(CR)

Link: https://lore.kernel.org/r/20191011140939.6115-4-justin.he@arm.com/
Change-Id: I69cd5568e648cdf098269958de9e8bcedd603df4
Signed-off-by: Jia He <justin.he@arm.com>
Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
(cherry picked from commit f2c4e5970cece75a895fcc45f0cd66b5a5ec0819)
Bug: 261052246
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Reviewed-on: https://gerrit.mot.com/2491778
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Reviewed-by: Xiangpo Zhao <zhaoxp3@motorola.com>
Submit-Approved: Jira Key
This commit is contained in:
Jia He 2019-10-11 22:09:38 +08:00 • committed by Xiaojun Ji
commit 0389a60f62
1 changed files with 6 additions and 0 deletions
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6
arch/x86/include/asm/pgtable.h
View file

@ -1467,6 +1467,12 @@ 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__ */