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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>
hifive-unleashed-5.1
Naoya Horiguchi 2016-01-15 16:57:46 -08:00 committed by Linus Torvalds
parent acc14dc4bd
commit 98fd1ef424
1 changed files with 8 additions and 8 deletions
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16
mm/memory-failure.c
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@ -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);
}