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authorMinchan Kim <minchan@kernel.org>2012-07-31 16:42:59 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-31 18:42:42 -0700
commit97d255c816946388bab504122937730d3447c612 (patch)
tree828927fe44ebb6c0bd6cfd2a0da36b68ed45b4ba /arch/s390
parentde34d965a80d0f61a354bdefa0b15a88bcff2028 (diff)
downloadlinux-linaro-stable-97d255c816946388bab504122937730d3447c612.tar.gz
mm: do not use page_count() without a page pin
d179e84ba ("mm: vmscan: do not use page_count without a page pin") fixed this problem in vmscan.c but same problem is in __count_immobile_pages(). I copy and paste d179e84ba's contents for description. "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." Signed-off-by: Minchan Kim <minchan@kernel.org> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Michal Hocko <mhocko@suse.cz> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Wanpeng Li <liwp.linux@gmail.com> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/s390')
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