diff options
| author | Will Deacon <will@kernel.org> | 2020-09-30 15:20:40 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-10-01 11:45:32 +0300 |
| commit | 6a1bdb173f9967b2329aab0f25bcba963f54e06b (patch) | |
| tree | 5f504bd8dd7dc5c1b67bedf76ca5726c503979fa /arch/arm64/mm/fault.c | |
| parent | e676594115f0bcc12d4791f9ee919e20d8d750ee (diff) | |
| download | linux-6a1bdb173f9967b2329aab0f25bcba963f54e06b.tar.xz | |
arm64: mm: Make flush_tlb_fix_spurious_fault() a no-op
Our use of broadcast TLB maintenance means that spurious page-faults
that have been handled already by another CPU do not require additional
TLB maintenance.
Make flush_tlb_fix_spurious_fault() a no-op and rely on the existing TLB
invalidation instead. Add an explicit flush_tlb_page() when making a page
dirty, as the TLB is permitted to cache the old read-only entry.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20200728092220.GA21800@willie-the-truck
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/mm/fault.c')
| -rw-r--r-- | arch/arm64/mm/fault.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index f07333e86c2f..a696a7921da4 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -218,7 +218,9 @@ int ptep_set_access_flags(struct vm_area_struct *vma, pteval = cmpxchg_relaxed(&pte_val(*ptep), old_pteval, pteval); } while (pteval != old_pteval); - flush_tlb_fix_spurious_fault(vma, address); + /* Invalidate a stale read-only entry */ + if (dirty) + flush_tlb_page(vma, address); return 1; } |