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| author | Andrea Arcangeli | 2011-01-14 00:47:16 +0100 |
|---|---|---|
| committer | Linus Torvalds | 2011-01-14 02:32:47 +0100 |
| commit | 91600e9e592e48736e630851c83da2ad6bf0e91f (patch) | |
| tree | 5b17c58699eed9c7440812f0f2f29f4c80972973 /mm/memcontrol.c | |
| parent | thp: add debug checks for mapcount related invariants (diff) | |
| download | kernel-qcow2-linux-91600e9e592e48736e630851c83da2ad6bf0e91f.tar.gz kernel-qcow2-linux-91600e9e592e48736e630851c83da2ad6bf0e91f.tar.xz kernel-qcow2-linux-91600e9e592e48736e630851c83da2ad6bf0e91f.zip | |
thp: fix memory-failure hugetlbfs vs THP collision
hugetlbfs was changed to allow memory failure to migrate the hugetlbfs
pages and that broke THP as split_huge_page was then called on hugetlbfs
pages too.
compound_head/order was also run unsafe on THP pages that can be splitted
at any time.
All compound_head() invocations in memory-failure.c that are run on pages
that aren't pinned and that can be freed and reused from under us (while
compound_head is running) are buggy because compound_head can return a
dangling pointer, but I'm not fixing this as this is a generic
memory-failure bug not specific to THP but it applies to hugetlbfs too, so
I can fix it later after THP is merged upstream.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
0 files changed, 0 insertions, 0 deletions