Memory error handling on hugepages can break a RSS counter, which emits
a message like "Bad rss-counter state mm:ffff88040abecac0 idx:1 val:-1".
This is because PageAnon returns true for hugepage (this behavior is
necessary for reverse mapping to work on hugetlbfs).
Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
---
mm/rmap.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git v3.7-rc8.orig/mm/rmap.c v3.7-rc8/mm/rmap.c
index 2ee1ef0..df54ef0 100644
--- v3.7-rc8.orig/mm/rmap.c
+++ v3.7-rc8/mm/rmap.c
@@ -1235,7 +1235,9 @@ int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
update_hiwater_rss(mm);
if (PageHWPoison(page) && !(flags & TTU_IGNORE_HWPOISON)) {
- if (PageAnon(page))
+ if (PageHuge(page))
+ ;
+ else if (PageAnon(page))
dec_mm_counter(mm, MM_ANONPAGES);
else
dec_mm_counter(mm, MM_FILEPAGES);
--
1.7.11.7
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