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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2016-02-17 13:11:12 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-02-18 16:23:24 -0800 |
| commit | 69a8ec2d8155b9121ca2990d43f8363b8e2bf550 (patch) | |
| tree | c55509679db328ac8456ea5227cbbc405f0abfbe /mm | |
| parent | 65c23c65bee479faceb042a52f5a7278dfa8d972 (diff) | |
| download | linux-69a8ec2d8155b9121ca2990d43f8363b8e2bf550.tar.gz linux-69a8ec2d8155b9121ca2990d43f8363b8e2bf550.tar.xz | |
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@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/huge_memory.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 08fc0ba2207e..722546dcfb7e 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1700,7 +1700,8 @@ bool move_huge_pmd(struct vm_area_struct *vma, struct vm_area_struct *new_vma, 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); |