The patch titled
Subject: mm/hwpoison: fix fail isolate hugetlbfs page w/ refcount held
has been added to the -mm tree. Its filename is
mm-hwpoison-fix-fail-isolate-hugetlbfs-page-w-refcount-held.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-hwpoison-fix-fail-isolate-hugetlbfs-page-w-refcount-held.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-hwpoison-fix-fail-isolate-hugetlbfs-page-w-refcount-held.patch
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------------------------------------------------------
From: Wanpeng Li <[email protected]>
Subject: mm/hwpoison: fix fail isolate hugetlbfs page w/ refcount held
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 <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: <[email protected]> [3.9+]
Signed-off-by: Andrew Morton <[email protected]>
---
mm/memory-failure.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
diff -puN
mm/memory-failure.c~mm-hwpoison-fix-fail-isolate-hugetlbfs-page-w-refcount-held
mm/memory-failure.c
---
a/mm/memory-failure.c~mm-hwpoison-fix-fail-isolate-hugetlbfs-page-w-refcount-held
+++ a/mm/memory-failure.c
@@ -1569,13 +1569,12 @@ static int soft_offline_huge_page(struct
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;
}
_
Patches currently in -mm which might be from [email protected] are
mm-hwpoison-fix-page-refcount-of-unkown-non-lru-page.patch
mm-hwpoison-fix-fail-isolate-hugetlbfs-page-w-refcount-held.patch
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