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Commit 282aa705 authored by Catalin Marinas's avatar Catalin Marinas Committed by Will Deacon
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arm64: Implement pmdp_set_access_flags() for hardware AF/DBM 



The update to the accessed or dirty states for block mappings must be
done atomically on hardware with support for automatic AF/DBM. The
ptep_set_access_flags() function has been fixed as part of commit
66dbd6e6 ("arm64: Implement ptep_set_access_flags() for hardware
AF/DBM"). This patch brings pmdp_set_access_flags() in line with the pte
counterpart.

Fixes: 2f4b829c ("arm64: Add support for hardware updates of the access and dirty pte bits")
Cc: <stable@vger.kernel.org> # 4.4.x: 66dbd6e6: arm64: Implement ptep_set_access_flags() for hardware AF/DBM
Cc: <stable@vger.kernel.org> # 4.3+
Reviewed-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 911f56ee

arch/arm64/include/asm/pgtable.h

+10 −0
Original line number Diff line number Diff line
@@ -540,6 +540,16 @@ extern int ptep_set_access_flags(struct vm_area_struct *vma, 
				 unsigned long address, pte_t *ptep,

				 pte_t entry, int dirty);



#ifdef CONFIG_TRANSPARENT_HUGEPAGE

#define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS

static inline int pmdp_set_access_flags(struct vm_area_struct *vma,

					unsigned long address, pmd_t *pmdp,

					pmd_t entry, int dirty)

{

	return ptep_set_access_flags(vma, address, (pte_t *)pmdp, pmd_pte(entry), dirty);

}

#endif



/*

 * Atomic pte/pmd modifications.

 */