linux-kernel - [PATCH 3/3] HWPOISON, hugetlbfs: fix RSS-counter warning

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Date:	Wed,  5 Dec 2012 16:47:38 -0500
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi.kleen@...el.com>
Cc:	Tony Luck <tony.luck@...el.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Subject: [PATCH 3/3] HWPOISON, hugetlbfs: fix RSS-counter warning

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@...jp.nec.com>
---
 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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