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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2016-01-15 16:57:46 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-15 17:56:32 -0800
commit98fd1ef4241ce0c700a174dd3e33c643b4774690 (patch)
tree1ace006ae24580bcdb8424f46a11e28c7397aa77
parentacc14dc4bd484f1fc8c227dd9fc2a1e592312d2b (diff)
downloadop-kernel-dev-98fd1ef4241ce0c700a174dd3e33c643b4774690.zip
op-kernel-dev-98fd1ef4241ce0c700a174dd3e33c643b4774690.tar.gz
mm: soft-offline: exit with failure for non anonymous thp
Currently memory_failure() doesn't handle non anonymous thp case, because we can hardly expect the error handling to be successful, and it can just hit some corner case which results in BUG_ON or something severe like that. This is also the case for soft offline code, so let's make it in the same way. Orignal code has a MF_COUNT_INCREASED check before put_hwpoison_page(), but it's unnecessary because get_any_page() is already called when running on this code, which takes a refcount of the target page regardress of the flag. So this patch also removes it. [akpm@linux-foundation.org: fix build] Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/memory-failure.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 2015c9a..ac595e7 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1691,16 +1691,16 @@ static int soft_offline_in_use_page(struct page *page, int flags)
if (!PageHuge(page) && PageTransHuge(hpage)) {
lock_page(hpage);
- ret = split_huge_page(hpage);
- unlock_page(hpage);
- if (unlikely(ret || PageTransCompound(page) ||
- !PageAnon(page))) {
- pr_info("soft offline: %#lx: failed to split THP\n",
- page_to_pfn(page));
- if (flags & MF_COUNT_INCREASED)
- put_hwpoison_page(hpage);
+ if (!PageAnon(hpage) || unlikely(split_huge_page(hpage))) {
+ unlock_page(hpage);
+ if (!PageAnon(hpage))
+ pr_info("soft offline: %#lx: non anonymous thp\n", page_to_pfn(page));
+ else
+ pr_info("soft offline: %#lx: thp split failed\n", page_to_pfn(page));
+ put_hwpoison_page(hpage);
return -EBUSY;
}
+ unlock_page(hpage);
get_hwpoison_page(page);
put_hwpoison_page(hpage);
}
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