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Commit 76c714be authored by Will Deacon's avatar Will Deacon
Browse files

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: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 9c4e08a3

arch/arm64/include/asm/pgtable.h

+10 −0
Original line number Diff line number Diff line
@@ -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)

{