From: Tejun Heo Date: Tue, 11 Feb 2014 16:52:47 +0000 (-0500) Subject: cgroup: release cgroup_mutex over file removals X-Git-Tag: v3.15-rc1~109^2~66 X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4ac0601744eb86e982fbdadde35f1945f7ce5882;p=pandora-kernel.git cgroup: release cgroup_mutex over file removals Now that cftypes and all tree modification operations are protected by cgroup_tree_mutex, we can drop cgroup_mutex while deleting files and directories. Drop cgroup_mutex over removals. This doesn't make any noticeable difference now but is to help kernfs conversion. In kernfs, removals are sync points which drain in-flight operations as those operations would grab cgroup_mutex, trying to delete under cgroup_mutex would deadlock. This can be resolved by just holding the outer cgroup_tree_mutex which nests outside both kernfs active reference and cgroup_mutex. Signed-off-by: Tejun Heo Acked-by: Li Zefan --- Reading git-diff-tree failed