diff options
author | Will Deacon <will.deacon@arm.com> | 2015-10-06 17:46:26 (GMT) |
---|---|---|
committer | Catalin Marinas <catalin.marinas@arm.com> | 2015-10-07 10:56:21 (GMT) |
commit | 5a7862e83000ccfd36db927c6f060458fe271157 (patch) | |
tree | 418e7e0fb2163f8fdc15026832cab1f65a7017ee /arch/arm64/include | |
parent | f3e002c24e1f3b66f6e392ecd6928b5d04672c54 (diff) | |
download | linux-5a7862e83000ccfd36db927c6f060458fe271157.tar.xz |
arm64: tlbflush: avoid flushing when fullmm == 1
The TLB gather code sets fullmm=1 when tearing down the entire address
space for an mm_struct on exit or execve. Given that the ASID allocator
will never re-allocate a dirty ASID, this flushing is not needed and can
simply be avoided in the flushing code.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include')
-rw-r--r-- | arch/arm64/include/asm/tlb.h | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/arch/arm64/include/asm/tlb.h b/arch/arm64/include/asm/tlb.h index d6e6b66..ffdaea7 100644 --- a/arch/arm64/include/asm/tlb.h +++ b/arch/arm64/include/asm/tlb.h @@ -37,17 +37,21 @@ static inline void __tlb_remove_table(void *_table) static inline void tlb_flush(struct mmu_gather *tlb) { - if (tlb->fullmm) { - flush_tlb_mm(tlb->mm); - } else { - struct vm_area_struct vma = { .vm_mm = tlb->mm, }; - /* - * The intermediate page table levels are already handled by - * the __(pte|pmd|pud)_free_tlb() functions, so last level - * TLBI is sufficient here. - */ - __flush_tlb_range(&vma, tlb->start, tlb->end, true); - } + struct vm_area_struct vma = { .vm_mm = tlb->mm, }; + + /* + * The ASID allocator will either invalidate the ASID or mark + * it as used. + */ + if (tlb->fullmm) + return; + + /* + * The intermediate page table levels are already handled by + * the __(pte|pmd|pud)_free_tlb() functions, so last level + * TLBI is sufficient here. + */ + __flush_tlb_range(&vma, tlb->start, tlb->end, true); } static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte, |