Messages in this thread Patch in this message | | | From | "Kirill A. Shutemov" <> | Subject | [PATCHv4 04/12] arm64: Provide pmdp_establish() helper | Date | Wed, 13 Dec 2017 13:57:48 +0300 |
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From: Catalin Marinas <catalin.marinas@arm.com>
We need an atomic way to setup pmd page table entry, avoiding races with CPU setting dirty/accessed bits. This is required to implement pmdp_invalidate() that doesn't lose these bits.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- arch/arm64/include/asm/pgtable.h | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 149d05fb9421..116d610a2620 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -676,6 +676,13 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm, { ptep_set_wrprotect(mm, address, (pte_t *)pmdp); } + +#define pmdp_establish pmdp_establish +static inline pmd_t pmdp_establish(struct vm_area_struct *vma, + unsigned long address, pmd_t *pmdp, pmd_t pmd) +{ + return __pmd(xchg_relaxed(&pmd_val(*pmdp), pmd_val(pmd))); +} #endif extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; -- 2.15.0
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