diff options
| author | Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2016-01-16 03:57:46 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-16 04:56:32 +0300 |
| commit | 98fd1ef4241ce0c700a174dd3e33c643b4774690 (patch) | |
| tree | 1ace006ae24580bcdb8424f46a11e28c7397aa77 /mm | |
| parent | acc14dc4bd484f1fc8c227dd9fc2a1e592312d2b (diff) | |
| download | linux-98fd1ef4241ce0c700a174dd3e33c643b4774690.tar.xz | |
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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memory-failure.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 2015c9a06cae..ac595e7a3a95 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); } |