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| author | Andrea Arcangeli | 2011-06-16 00:08:51 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2011-06-16 05:04:02 +0200 |
| commit | d179e84ba5da1d0024087d1759a2938817a00f3f (patch) | |
| tree | 169c9cc4030a793df1bc29613eff85ee3acef9a9 /mm/compaction.c | |
| parent | mm: compaction: ensure that the compaction free scanner does not move to the ... (diff) | |
| download | kernel-qcow2-linux-d179e84ba5da1d0024087d1759a2938817a00f3f.tar.gz kernel-qcow2-linux-d179e84ba5da1d0024087d1759a2938817a00f3f.tar.xz kernel-qcow2-linux-d179e84ba5da1d0024087d1759a2938817a00f3f.zip | |
mm: vmscan: do not use page_count without a page pin
It is unsafe to run page_count during the physical pfn scan because
compound_head could trip on a dangling pointer when reading
page->first_page if the compound page is being freed by another CPU.
[mgorman@suse.de: split out patch]
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/compaction.c')
0 files changed, 0 insertions, 0 deletions