From 76c714be0e5e60c935a53b31be58939510ba1d0f Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Fri, 30 Oct 2015 18:56:19 +0000 Subject: 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 Signed-off-by: Will Deacon --- arch/arm64/include/asm/pgtable.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'arch/arm64/include/asm/pgtable.h') 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) { -- cgit v1.2.3-59-g8ed1b