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authorAndrea Arcangeli <aarcange@redhat.com>2011-01-13 15:47:16 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 17:32:47 -0800
commit91600e9e592e48736e630851c83da2ad6bf0e91f (patch)
tree5b17c58699eed9c7440812f0f2f29f4c80972973 /mm/memory-failure.c
parent14d1a55cd26f1860f837f37ae42520c7c13b1347 (diff)
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/memory-failure.c')
-rw-r--r--mm/memory-failure.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 6a283cc9317c..1b43d0ffff65 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -386,7 +386,7 @@ static void collect_procs_anon(struct page *page, struct list_head *to_kill,
struct task_struct *tsk;
struct anon_vma *av;
- if (unlikely(split_huge_page(page)))
+ if (!PageHuge(page) && unlikely(split_huge_page(page)))
return;
read_lock(&tasklist_lock);
av = page_lock_anon_vma(page);