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authorOleg Nesterov <oleg@redhat.com>2014-01-21 15:50:01 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-10-05 14:54:15 -0700
commitd081edee3aa2695765ff836197846b89ab712b05 (patch)
tree72cacca2ea861d3ee6bf17be6bd51ce7296c3470 /Makefile
parenta214c050ee476860bccfef17e24028b9a0750360 (diff)
oom_kill: add rcu_read_lock() into find_lock_task_mm()
commit 4d4048be8a93769350efa31d2482a038b7de73d0 upstream. find_lock_task_mm() expects it is called under rcu or tasklist lock, but it seems that at least oom_unkillable_task()->task_in_mem_cgroup() and mem_cgroup_out_of_memory()->oom_badness() can call it lockless. Perhaps we could fix the callers, but this patch simply adds rcu lock into find_lock_task_mm(). This also allows to simplify a bit one of its callers, oom_kill_process(). Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: Sergey Dyasly <dserrg@gmail.com> Cc: Sameer Nanda <snanda@chromium.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mandeep Singh Baines <msb@chromium.org> Cc: "Ma, Xindong" <xindong.ma@intel.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Cc: "Tu, Xiaobing" <xiaobing.tu@intel.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Li Zefan <lizefan@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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