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| author | Miaohe Lin <linmiaohe@huawei.com> | 2022-03-22 14:44:44 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-03-22 15:57:07 -0700 |
| commit | 888af2701db79b9b27c7e37f9ede528a5ca53b76 (patch) | |
| tree | 407681cc93ae20b77e553816228978e38c2cb132 /include/ras/ras_event.h | |
| parent | a06ad3c0c75297f0b0999b1a981e50224e690ee9 (diff) | |
| download | lwn-888af2701db79b9b27c7e37f9ede528a5ca53b76.tar.gz lwn-888af2701db79b9b27c7e37f9ede528a5ca53b76.zip | |
mm/memory-failure.c: fix race with changing page compound again
Patch series "A few fixup patches for memory failure", v2.
This series contains a few patches to fix the race with changing page
compound page, make non-LRU movable pages unhandlable and so on. More
details can be found in the respective changelogs.
There is a race window where we got the compound_head, the hugetlb page
could be freed to buddy, or even changed to another compound page just
before we try to get hwpoison page. Think about the below race window:
CPU 1 CPU 2
memory_failure_hugetlb
struct page *head = compound_head(p);
hugetlb page might be freed to
buddy, or even changed to another
compound page.
get_hwpoison_page -- page is not what we want now...
If this race happens, just bail out. Also MF_MSG_DIFFERENT_PAGE_SIZE is
introduced to record this event.
[akpm@linux-foundation.org: s@/**@/*@, per Naoya Horiguchi]
Link: https://lkml.kernel.org/r/20220312074613.4798-1-linmiaohe@huawei.com
Link: https://lkml.kernel.org/r/20220312074613.4798-2-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/ras/ras_event.h')
| -rw-r--r-- | include/ras/ras_event.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/ras/ras_event.h b/include/ras/ras_event.h index d0337a41141c..1e694fd239b9 100644 --- a/include/ras/ras_event.h +++ b/include/ras/ras_event.h @@ -374,6 +374,7 @@ TRACE_EVENT(aer_event, EM ( MF_MSG_BUDDY, "free buddy page" ) \ EM ( MF_MSG_DAX, "dax page" ) \ EM ( MF_MSG_UNSPLIT_THP, "unsplit thp" ) \ + EM ( MF_MSG_DIFFERENT_PAGE_SIZE, "different page size" ) \ EMe ( MF_MSG_UNKNOWN, "unknown page" ) /* |