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authorTejun Heo <tj@kernel.org>2012-03-29 22:03:33 -0700
committerTejun Heo <tj@kernel.org>2012-03-29 22:03:33 -0700
commit8f121918f2e49f852de1acdc5255cc1ef440d85b (patch)
tree552dbbc407189e45b6941cf117b39681dc1f7e40 /scripts
parentad50c15919e8aca7ea30f9dcf4bac52448c9ab46 (diff)
downloadlinux-8f121918f2e49f852de1acdc5255cc1ef440d85b.tar.bz2
cgroup: cgroup_attach_task() could return -errno after success
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> Reviewed-by: Mandeep Singh Baines <msb@chromium.org> Acked-by: Li Zefan <lizefan@huawei.com>
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