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mm/hwpoison: fix fail isolate hugetlbfs page w/ refcount held

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commit 036138080a upstream.

Hugetlbfs pages will get a refcount in get_any_page() or
madvise_hwpoison() if soft offlining through madvise.  The refcount which
is held by the soft offline path should be released if we fail to isolate
hugetlbfs pages.

Fix it by reducing the refcount for both isolation success and failure.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wanpeng Li
2015-08-14 15:34:59 -07:00
committed by Greg Kroah-Hartman
parent 0ebc1f07b7
commit d73eba8c9e
1 changed files with 6 additions and 7 deletions
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13
mm/memory-failure.c
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@@ -1589,13 +1589,12 @@ static int soft_offline_huge_page(struct page *page, int flags)
unlock_page(hpage);
ret = isolate_huge_page(hpage, &pagelist);
if (ret) {
/*
* get_any_page() and isolate_huge_page() takes a refcount each,
* so need to drop one here.
*/
put_page(hpage);
} else {
/*
* get_any_page() and isolate_huge_page() takes a refcount each,
* so need to drop one here.
*/
put_page(hpage);
if (!ret) {
pr_info("soft offline: %#lx hugepage failed to isolate\n", pfn);
return -EBUSY;
}