Commit be91748f authored Sep 08, 2015 by Wanpeng Li Committed by Linus Torvalds Sep 08, 2015

mm/hwpoison: fix refcount of THP head page in no-injection case

Hwpoison injection takes a refcount of target page and another refcount
of head page of THP if the target page is the tail page of a THP.
However, current code doesn't release the refcount of head page if the
THP is not supported to be injected wrt hwpoison filter.

Fix it by reducing the refcount of head page if the target page is the
tail page of a THP and it is not supported to be injected.

Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Acked-by: 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>

parent 94bf4ec8

mm/hwpoison-inject.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -58,7 +58,7 @@ static int hwpoison_inject(void *data, u64 val)
		pr_info("Injecting memory failure at pfn %#lx\n", pfn);
		return memory_failure(pfn, 18, MF_COUNT_INCREASED);
		put_out:
		put_page(p);
		put_hwpoison_page(p);
		return 0;
		}