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| author | Will Deacon <will.deacon@arm.com> | 2015-10-30 21:56:19 +0300 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2015-12-01 12:47:03 +0300 |
| commit | 76c714be0e5e60c935a53b31be58939510ba1d0f (patch) | |
| tree | 106dcc2450ab8d83da0819c3362172d44f0cfca9 /arch/arm64/include/asm/pgtable.h | |
| parent | 9c4e08a3022b6df90d31ef4007291faabfce5431 (diff) | |
| download | linux-76c714be0e5e60c935a53b31be58939510ba1d0f.tar.xz | |
arm64: pgtable: implement pte_accessible()
This patch implements the pte_accessible() macro, which can be used to
test whether or not a given pte is a candidate for allocation in the
TLB.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/pgtable.h')
| -rw-r--r-- | arch/arm64/include/asm/pgtable.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 7e074f93f383..450b355f3f49 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -167,6 +167,16 @@ extern struct page *empty_zero_page; ((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER)) #define pte_valid_not_user(pte) \ ((pte_val(pte) & (PTE_VALID | PTE_USER)) == PTE_VALID) +#define pte_valid_young(pte) \ + ((pte_val(pte) & (PTE_VALID | PTE_AF)) == (PTE_VALID | PTE_AF)) + +/* + * Could the pte be present in the TLB? We must check mm_tlb_flush_pending + * so that we don't erroneously return false for pages that have been + * remapped as PROT_NONE but are yet to be flushed from the TLB. + */ +#define pte_accessible(mm, pte) \ + (mm_tlb_flush_pending(mm) ? pte_present(pte) : pte_valid_young(pte)) static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot) { |