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| author | James Morse <james.morse@arm.com> | 2017-06-16 14:02:29 -0700 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2017-09-15 18:30:12 +0100 |
| commit | 983bd66dd19995ee23e06badfd4ae4e6c7bee770 (patch) | |
| tree | 64b57b4917c7970b161d0c5f8fa4223b3aead68d /mm/memory-failure.c | |
| parent | f48449f002f0fc2812ce33d89879dbe445eaa023 (diff) | |
| download | linux-stable-983bd66dd19995ee23e06badfd4ae4e6c7bee770.tar.gz linux-stable-983bd66dd19995ee23e06badfd4ae4e6c7bee770.tar.bz2 linux-stable-983bd66dd19995ee23e06badfd4ae4e6c7bee770.zip | |
mm/memory-failure.c: use compound_head() flags for huge pages
commit 7258ae5c5a2ce2f5969e8b18b881be40ab55433d upstream.
memory_failure() chooses a recovery action function based on the page
flags. For huge pages it uses the tail page flags which don't have
anything interesting set, resulting in:
> Memory failure: 0x9be3b4: Unknown page state
> Memory failure: 0x9be3b4: recovery action for unknown page: Failed
Instead, save a copy of the head page's flags if this is a huge page,
this means if there are no relevant flags for this tail page, we use the
head pages flags instead. This results in the me_huge_page() recovery
action being called:
> Memory failure: 0x9b7969: recovery action for huge page: Delayed
For hugepages that have not yet been allocated, this allows the hugepage
to be dequeued.
Fixes: 524fca1e7356 ("HWPOISON: fix misjudgement of page_action() for errors on mlocked pages")
Link: http://lkml.kernel.org/r/20170524130204.21845-1-james.morse@arm.com
Signed-off-by: James Morse <james.morse@arm.com>
Tested-by: Punit Agrawal <punit.agrawal@arm.com>
Acked-by: Punit Agrawal <punit.agrawal@arm.com>
Acked-by: 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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'mm/memory-failure.c')
| -rw-r--r-- | mm/memory-failure.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c index f0c96487b31e..eb99a91a8434 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1179,7 +1179,10 @@ int memory_failure(unsigned long pfn, int trapno, int flags) * page_remove_rmap() in try_to_unmap_one(). So to determine page status * correctly, we save a copy of the page flags at this time. */ - page_flags = p->flags; + if (PageHuge(p)) + page_flags = hpage->flags; + else + page_flags = p->flags; /* * unpoison always clear PG_hwpoison inside page lock |