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| author | Catalin Marinas <catalin.marinas@arm.com> | 2018-01-31 16:17:55 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-01-31 17:18:37 -0800 |
| commit | 1d78a62cb3bb2bd95d00149daaa144f1fe0a77df (patch) | |
| tree | 711d0f07de627b1aa958cd41611a3c5ac6742ee4 /arch/arm64 | |
| parent | ef298cc567684e33d0c9f490e71884851b646d41 (diff) | |
| download | linux-1d78a62cb3bb2bd95d00149daaa144f1fe0a77df.tar.bz2 | |
arm64: provide pmdp_establish() helper
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.
Link: http://lkml.kernel.org/r/20171213105756.69879-5-kirill.shutemov@linux.intel.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/pgtable.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 89167c43ebb5..094374c82db0 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -706,6 +706,13 @@ 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]; |