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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2015-06-24 16:56:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-06-24 17:49:42 -0700
commit2491ffee9e66edc2a6ff5ddb49118377257c0014 (patch)
treedb0a667f222c51a797a9d47f0d09166622bca036 /mm/memory-failure.c
parentadd05cecef803f3372c5fc1d2a964171872daf9f (diff)
mm/memory-failure: me_huge_page() does nothing for thp
memory_failure() is supposed not to handle thp itself, but to split it. But if something were wrong and page_action() were called on thp, me_huge_page() (action routine for hugepages) should be better to take no action, rather than to take wrong action prepared for hugetlb (which triggers BUG_ON().) This change is for potential problems, but makes sense to me because thp is an actively developing feature and this code path can be open in the future. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Tony Luck <tony.luck@intel.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> 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.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 62ebb1b7f4bf..c72f41bfbaaf 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -777,6 +777,10 @@ static int me_huge_page(struct page *p, unsigned long pfn)
{
int res = 0;
struct page *hpage = compound_head(p);
+
+ if (!PageHuge(hpage))
+ return MF_DELAYED;
+
/*
* We can safely recover from error on free or reserved (i.e.
* not in-use) hugepage by dequeuing it from freelist.