Messages in this thread | | | Date | Fri, 30 Mar 2012 08:37:05 +0800 | From | Li Zefan <> | Subject | Re: [PATCH for-3.4-fixes] cgroup: cgroup_attach_task() could return -errno after success |
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Tejun Heo wrote:
> 61d1d219c4 "cgroup: remove extra calls to find_existing_css_set" made > cgroup_task_migrate() return void. An unfortunate side effect was > that cgroup_attach_task() was depending on that function's return > value to clear its @retval on the success path. On cgroup mounts > without any subsystem with ->can_attach() callback, > cgroup_attach_task() ended up returning @retval without initializing > it on success. > > For some reason, gcc failed to warn about it and it didn't cause > cgroup_attach_task() to return non-zero value in many cases, probably > due to difference in register allocation. When the problem > materializes, systemd fails to populate /systemd cgroup mount and > fails to boot. > > Fix it by initializing @retval to zero on declaration. > > Signed-off-by: Tejun Heo <tj@kernel.org> > Reported-by: Jiri Kosina <jkosina@suse.cz> > LKML-Reference: <alpine.LNX.2.00.1203282354440.25526@pobox.suse.cz>
Acked-by: Li Zefan <lizefan@huawei.com>
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