This is a note to let you know that I've just added the patch titled
mm/hwpoison: fix fail isolate hugetlbfs page w/ refcount held
to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-hwpoison-fix-fail-isolate-hugetlbfs-page-w-refcount-held.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 036138080a4376e5f3e5d0cca8ac99084c5cf06e Mon Sep 17 00:00:00 2001
From: Wanpeng Li <[email protected]>
Date: Fri, 14 Aug 2015 15:34:59 -0700
Subject: mm/hwpoison: fix fail isolate hugetlbfs page w/ refcount held
From: Wanpeng Li <[email protected]>
commit 036138080a4376e5f3e5d0cca8ac99084c5cf06e 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 <[email protected]>
Acked-by: Naoya Horiguchi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
mm/memory-failure.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1589,13 +1589,12 @@ 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 stable-queue which might be from [email protected] are
queue-4.1/mm-hwpoison-fix-fail-isolate-hugetlbfs-page-w-refcount-held.patch
queue-4.1/mm-hwpoison-fix-page-refcount-of-unknown-non-lru-page.patch
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