[PATCH v2 1/5] mm/hwpoison: fix fail to split thp w/ refcount held
From: Wanpeng Li <hidden>
Date: 2015-08-10 11:56:12
Also in:
lkml
Subsystem:
hwpoison memory failure handling, memory management, the rest · Maintainers:
Miaohe Lin, Andrew Morton, Linus Torvalds
THP pages will get a refcount in madvise_hwpoison() w/ MF_COUNT_INCREASED flag, however, the refcount is still held when fail to split THP pages. Fix it by reducing the refcount of THP pages when fail to split THP. Signed-off-by: Wanpeng Li <redacted> --- mm/memory-failure.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 8077b1c..56b8a71 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c@@ -1710,6 +1710,8 @@ int soft_offline_page(struct page *page, int flags) if (PageAnon(hpage) && unlikely(split_huge_page(hpage))) { pr_info("soft offline: %#lx: failed to split THP\n", pfn); + if (flags & MF_COUNT_INCREASED) + put_page(page); return -EBUSY; } }
--
1.7.1
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