forked from luck/tmp_suning_uos_patched
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>
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@ -386,7 +386,7 @@ static void collect_procs_anon(struct page *page, struct list_head *to_kill,
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struct task_struct *tsk;
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struct anon_vma *av;
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if (unlikely(split_huge_page(page)))
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if (!PageHuge(page) && unlikely(split_huge_page(page)))
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return;
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read_lock(&tasklist_lock);
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av = page_lock_anon_vma(page);
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