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| author | Hugh Dickins <hughd@google.com> | 2013-10-16 13:47:08 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-11-04 04:35:20 -0800 |
| commit | 08899aecf62e61328acbadd35b8c98dbda7a5ec4 (patch) | |
| tree | ad67af9581991dfb9415b305c90afb2cb35b5d42 /lib/mpi/mpi-inline.h | |
| parent | 4e31a0e20aa1788668b0322396c0e16e06b302da (diff) | |
mm: fix BUG in __split_huge_page_pmd
commit 750e8165f5e87b6a142be953640eabb13a9d350a upstream.
Occasionally we hit the BUG_ON(pmd_trans_huge(*pmd)) at the end of
__split_huge_page_pmd(): seen when doing madvise(,,MADV_DONTNEED).
It's invalid: we don't always have down_write of mmap_sem there: a racing
do_huge_pmd_wp_page() might have copied-on-write to another huge page
before our split_huge_page() got the anon_vma lock.
Forget the BUG_ON, just go back and try again if this happens.
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib/mpi/mpi-inline.h')
0 files changed, 0 insertions, 0 deletions