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authorWill Deacon <will.deacon@arm.com>2015-10-30 18:56:19 +0000
committerWill Deacon <will.deacon@arm.com>2015-12-01 09:47:03 +0000
commit76c714be0e5e60c935a53b31be58939510ba1d0f (patch)
tree106dcc2450ab8d83da0819c3362172d44f0cfca9 /arch/arm64/include/asm/pgtable.h
parentarm64: mm: allow sections for unaligned bases (diff)
downloadlinux-dev-76c714be0e5e60c935a53b31be58939510ba1d0f.tar.xz
linux-dev-76c714be0e5e60c935a53b31be58939510ba1d0f.zip
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 '')
-rw-r--r--arch/arm64/include/asm/pgtable.h10
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)
{