From: Li Zefan Date: Thu, 24 Jan 2013 06:31:27 +0000 (+0800) Subject: cgroup: remove duplicate RCU free on struct cgroup X-Git-Tag: v3.9-rc1~157^2~6 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=86a3db5643c7d29bb36ca85c7a4bb67ad4d88d77;p=pandora-kernel.git cgroup: remove duplicate RCU free on struct cgroup When destroying a cgroup, though in cgroup_diput() we've called synchronize_rcu(), we then still have to free it via call_rcu(). The story is, long ago to fix a race between reading /proc/sched_debug and freeing cgroup, the code was changed to utilize call_rcu(). See commit a47295e6bc42ad35f9c15ac66f598aa24debd4e2 ("cgroups: make cgroup_path() RCU-safe") As we've fixed cpu cgroup that cpu_cgroup_offline_css() is used to unregister a task_group so there won't be concurrent access to this task_group after synchronize_rcu() in diput(). Now we can just kfree(cgrp). Signed-off-by: Li Zefan Signed-off-by: Tejun Heo --- Reading git-diff-tree failed