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| author | Al Viro <viro@zeniv.linux.org.uk> | 2016-12-16 16:21:05 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-12-16 16:21:05 -0500 |
| commit | 3c55d6bcfe8163ff2b5636b4aabe3caa3f5d95f4 (patch) | |
| tree | 3229c2de6e95352751d1c9e05dcd2925a3212beb /mm/mremap.c | |
| parent | 4da00fd1b948b408f76488c4e506af748be5fce8 (diff) | |
| parent | 29ac8e856cb3694e004037de595dec4ec53d42f2 (diff) | |
Merge remote-tracking branch 'djwong/ocfs2-vfs-reflink-6' into for-linus
Diffstat (limited to 'mm/mremap.c')
| -rw-r--r-- | mm/mremap.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/mm/mremap.c b/mm/mremap.c index 6ccecc03f56a..30d7d2482eea 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -149,14 +149,18 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd, if (pte_none(*old_pte)) continue; + pte = ptep_get_and_clear(mm, old_addr, old_pte); /* - * We are remapping a dirty PTE, make sure to - * flush TLB before we drop the PTL for the + * If we are remapping a dirty PTE, make sure + * to flush TLB before we drop the PTL for the * old PTE or we may race with page_mkclean(). + * + * This check has to be done after we removed the + * old PTE from page tables or another thread may + * dirty it after the check and before the removal. */ - if (pte_present(*old_pte) && pte_dirty(*old_pte)) + if (pte_present(pte) && pte_dirty(pte)) force_flush = true; - pte = ptep_get_and_clear(mm, old_addr, old_pte); pte = move_pte(pte, new_vma->vm_page_prot, old_addr, new_addr); pte = move_soft_dirty_pte(pte); set_pte_at(mm, new_addr, new_pte, pte); |