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>

2 files changed, 2 insertions, 2 deletions

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 6a283cc9317..1b43d0ffff6 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);
diff --git a/mm/rmap.c b/mm/rmap.c
index 3825ae4bc32..c30f33854f9 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -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);