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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>
This commit is contained in:
Wanpeng Li 2015-09-08 15:03:18 -07:00 committed by Linus Torvalds
parent 94bf4ec84a
commit be91748fa6
1 changed files with 1 additions and 1 deletions
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2
mm/hwpoison-inject.c
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@ -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;
}