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authorCatalin Marinas <catalin.marinas@arm.com>2018-01-31 16:17:55 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-01-31 17:18:37 -0800
commit1d78a62cb3bb2bd95d00149daaa144f1fe0a77df (patch)
tree711d0f07de627b1aa958cd41611a3c5ac6742ee4 /arch
parentef298cc567684e33d0c9f490e71884851b646d41 (diff)
downloadlinux-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')
-rw-r--r--arch/arm64/include/asm/pgtable.h7
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];