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thp: fix memory-failure hugetlbfs vs THP collision

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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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andrea Arcangeli 2011-01-13 15:47:16 -08:00 • committed by Linus Torvalds
commit 91600e9e59
2 changed files with 2 additions and 2 deletions
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2
mm/rmap.c
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@ -1430,7 +1430,7 @@ int try_to_unmap(struct page *page, enum ttu_flags flags)
int ret;
BUG_ON(!PageLocked(page));
BUG_ON(PageTransHuge(page));
VM_BUG_ON(!PageHuge(page) && PageTransHuge(page));
if (unlikely(PageKsm(page)))
ret = try_to_unmap_ksm(page, flags);