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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2009-11-11 14:26:26 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-11-12 07:25:56 -0800
commite00e431612c3a6e437a01f2129fd3843da0c982a (patch)
tree4f838123d0b295ab3608380ce803c8960a8ebfd0 /arch/alpha
parentb9f9d4706cb1b706f89f98ea6ead41ebecdefbc2 (diff)
downloadlinux-stericsson-e00e431612c3a6e437a01f2129fd3843da0c982a.tar.gz
memcg: fix wrong pointer initialization at page migration when memcg is disabled.
Lee Schermerhorn reported that he saw bad pointer dereference in mem_cgroup_end_migration() when he disabled memcg by boot option. memcg's page migration logic works as mem_cgroup_prepare_migration(page, &ptr); do page migration mem_cgroup_end_migration(page, ptr); Now, ptr is not initialized in prepare_migration when memcg is disabled by boot option. This causes panic in end_migration. This patch fixes it. Reported-by: Lee Schermerhorn <Lee.Schermerhorn@hp.com> Cc: Balbir Singh <balbir@in.ibm.com> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Reviewed-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/alpha')
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