The patch titled
Subject: khugepaged: recheck pmd after mmap_sem re-acquired
has been removed from the -mm tree. Its filename was
khugepaged-recheck-pmd-after-mmap_sem-re-acquired.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: khugepaged: recheck pmd after mmap_sem re-acquired
Vlastimil noted[1] that pmd can be no longer valid after we drop
mmap_sem. We need recheck it once mmap_sem taken again.
[1] http://lkml.kernel.org/r/12918dcd-a695-c6f4-e06f-69141c5f357f@xxxxxxx
Link: http://lkml.kernel.org/r/1466021202-61880-6-git-send-email-kirill.shutemov@xxxxxxxxxxxxxxx
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 6 ++++++
1 file changed, 6 insertions(+)
diff -puN mm/huge_memory.c~khugepaged-recheck-pmd-after-mmap_sem-re-acquired mm/huge_memory.c
--- a/mm/huge_memory.c~khugepaged-recheck-pmd-after-mmap_sem-re-acquired
+++ a/mm/huge_memory.c
@@ -2433,6 +2433,9 @@ static bool __collapse_huge_page_swapin(
/* vma is no longer available, don't continue to swapin */
if (hugepage_vma_revalidate(mm, address))
return false;
+ /* check if the pmd is still valid */
+ if (mm_find_pmd(mm, address) != pmd)
+ return false;
}
if (ret & VM_FAULT_ERROR) {
trace_mm_collapse_huge_page_swapin(mm, swapped_in, 0);
@@ -2518,6 +2521,9 @@ static void collapse_huge_page(struct mm
result = hugepage_vma_revalidate(mm, address);
if (result)
goto out;
+ /* check if the pmd is still valid */
+ if (mm_find_pmd(mm, address) != pmd)
+ goto out;
anon_vma_lock_write(vma->anon_vma);
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
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