The patch titled
Subject: mm: bad_page() checks bad_flags instead of page->flags for hwpoison page
has been added to the -mm tree. Its filename is
mm-bad_page-checks-bad_flags-instead-of-page-flags-for-hwpoison-page.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-bad_page-checks-bad_flags-instead-of-page-flags-for-hwpoison-page.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-bad_page-checks-bad_flags-instead-of-page-flags-for-hwpoison-page.patch
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------------------------------------------------------
From: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Subject: mm: bad_page() checks bad_flags instead of page->flags for hwpoison page
There's a race window between checking page->flags and unpoisoning, which
taints kernel with "BUG: Bad page state". That's overkill. It's safer to
use bad_flags to detect hwpoisoned page.
Link: http://lkml.kernel.org/r/1463470975-29972-1-git-send-email-n-horiguchi@xxxxxxxxxxxxx
Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN mm/page_alloc.c~mm-bad_page-checks-bad_flags-instead-of-page-flags-for-hwpoison-page mm/page_alloc.c
--- a/mm/page_alloc.c~mm-bad_page-checks-bad_flags-instead-of-page-flags-for-hwpoison-page
+++ a/mm/page_alloc.c
@@ -522,8 +522,8 @@ static void bad_page(struct page *page,
static unsigned long nr_shown;
static unsigned long nr_unshown;
- /* Don't complain about poisoned pages */
- if (PageHWPoison(page)) {
+ /* Don't complain about hwpoisoned pages */
+ if (bad_flags == __PG_HWPOISON) {
page_mapcount_reset(page); /* remove PageBuddy */
return;
}
_
Patches currently in -mm which might be from n-horiguchi@xxxxxxxxxxxxx are
mm-bad_page-checks-bad_flags-instead-of-page-flags-for-hwpoison-page.patch
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