From 4ac0601744eb86e982fbdadde35f1945f7ce5882 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Tue, 11 Feb 2014 11:52:47 -0500 Subject: [PATCH] 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-format-patch failed