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authorWanpeng Li <wanpeng.li@hotmail.com>2015-09-08 15:03:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-08 15:35:28 -0700
commit7d1900c744b2e4687b3e467edf58373c02bcf22d (patch)
tree172e71a73d3b159dc2da1ca1fe344b59a3f5ce2f /mm/memory-failure.c
parent5dd2c4bded8776ee93c8f38b739fea531095067f (diff)
downloadop-kernel-dev-7d1900c744b2e4687b3e467edf58373c02bcf22d.zip
op-kernel-dev-7d1900c744b2e4687b3e467edf58373c02bcf22d.tar.gz
mm/hwpoison: fix failure to split thp w/ refcount held
THP pages will get a refcount in madvise_hwpoison() w/ MF_COUNT_INCREASED flag, however, the refcount is still held when fail to split THP pages. Fix it by reducing the refcount of THP pages when fail to split THP. Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> 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.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 016c814..8ad923a 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1725,6 +1725,8 @@ int soft_offline_page(struct page *page, int flags)
if (PageAnon(hpage) && unlikely(split_huge_page(hpage))) {
pr_info("soft offline: %#lx: failed to split THP\n",
pfn);
+ if (flags & MF_COUNT_INCREASED)
+ put_page(page);
return -EBUSY;
}
}
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