Commit 0795edaf authored by Will Deacon's avatar Will Deacon Committed by Catalin Marinas
Browse files

arm64: pgtable: Implement p[mu]d_valid() and check in set_p[mu]d() 



Now that our walk-cache invalidation routines imply a DSB before the
invalidation, we no longer need one when we are clearing an entry during
unmap.

Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 45a284bc

arch/arm64/include/asm/pgtable.h

+8 −2
Original line number Diff line number Diff line
@@ -360,6 +360,7 @@ static inline int pmd_protnone(pmd_t pmd) 
#define pmd_present(pmd)	pte_present(pmd_pte(pmd))

#define pmd_dirty(pmd)		pte_dirty(pmd_pte(pmd))

#define pmd_young(pmd)		pte_young(pmd_pte(pmd))

#define pmd_valid(pmd)		pte_valid(pmd_pte(pmd))

#define pmd_wrprotect(pmd)	pte_pmd(pte_wrprotect(pmd_pte(pmd)))

#define pmd_mkold(pmd)		pte_pmd(pte_mkold(pmd_pte(pmd)))

#define pmd_mkwrite(pmd)	pte_pmd(pte_mkwrite(pmd_pte(pmd)))
@@ -431,6 +432,8 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 
static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)

{

	WRITE_ONCE(*pmdp, pmd);



	if (pmd_valid(pmd))

		dsb(ishst);

}
@@ -477,10 +480,13 @@ static inline phys_addr_t pmd_page_paddr(pmd_t pmd) 
#define pud_none(pud)		(!pud_val(pud))

#define pud_bad(pud)		(!(pud_val(pud) & PUD_TABLE_BIT))

#define pud_present(pud)	pte_present(pud_pte(pud))

#define pud_valid(pud)		pte_valid(pud_pte(pud))



static inline void set_pud(pud_t *pudp, pud_t pud)

{

	WRITE_ONCE(*pudp, pud);



	if (pud_valid(pud))

		dsb(ishst);

}

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