The patch titled
Subject: thp, dax: do not try to withdraw pgtable from non-anon VMA
has been added to the -mm tree. Its filename is
thp-dax-do-not-try-to-withdraw-pgtable-from-non-anon-vma.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/thp-dax-do-not-try-to-withdraw-pgtable-from-non-anon-vma.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/thp-dax-do-not-try-to-withdraw-pgtable-from-non-anon-vma.patch
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------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: thp, dax: do not try to withdraw pgtable from non-anon VMA
DAX doesn't deposit pgtables when it maps huge pages: nothing to
withdraw. It can lead to crash.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN mm/huge_memory.c~thp-dax-do-not-try-to-withdraw-pgtable-from-non-anon-vma mm/huge_memory.c
--- a/mm/huge_memory.c~thp-dax-do-not-try-to-withdraw-pgtable-from-non-anon-vma
+++ a/mm/huge_memory.c
@@ -1700,7 +1700,8 @@ bool move_huge_pmd(struct vm_area_struct
pmd = pmdp_huge_get_and_clear(mm, old_addr, old_pmd);
VM_BUG_ON(!pmd_none(*new_pmd));
- if (pmd_move_must_withdraw(new_ptl, old_ptl)) {
+ if (pmd_move_must_withdraw(new_ptl, old_ptl) &&
+ vma_is_anonymous(vma)) {
pgtable_t pgtable;
pgtable = pgtable_trans_huge_withdraw(mm, old_pmd);
pgtable_trans_huge_deposit(mm, new_pmd, pgtable);
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
mm-dax-check-for-pmd_none-after-split_huge_pmd.patch
thp-dax-do-not-try-to-withdraw-pgtable-from-non-anon-vma.patch
ipc-shm-handle-removed-segments-gracefully-in-shm_mmap.patch
thp-cleanup-split_huge_page.patch
thp-vmstats-count-deferred-split-events.patch
mm-make-swapin-readahead-to-improve-thp-collapse-rate-fix.patch
mm-make-swapin-readahead-to-improve-thp-collapse-rate-fix-2.patch
mm-make-swapin-readahead-to-improve-thp-collapse-rate-fix-3.patch
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