mm/hwpoison: fix failure to split thp w/ refcount held
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 <wanpeng.li@hotmail.com>
Cc: 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>
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 016c814..8ad923a 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1725,6 +1725,8 @@
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;
}
}