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| author | Tejun Heo <tj@kernel.org> | 2011-12-13 03:12:21 +0100 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2011-12-13 03:12:21 +0100 |
| commit | e25e2cbb4c6679bed5f52fb0f2cc381688297901 (patch) | |
| tree | ba11d495cba21d3d233d4e25f94676ef9d0055ae /kernel/fork.c | |
| parent | PM / Freezer: Remove the "userspace only" constraint from freezer[_do_not]_co... (diff) | |
| download | linux-e25e2cbb4c6679bed5f52fb0f2cc381688297901.tar.xz linux-e25e2cbb4c6679bed5f52fb0f2cc381688297901.zip | |
cgroup: add cgroup_root_mutex
cgroup wants to make threadgroup stable while modifying cgroup
hierarchies which will introduce locking dependency on
cred_guard_mutex from cgroup_mutex. This unfortunately completes
circular dependency.
A. cgroup_mutex -> cred_guard_mutex -> s_type->i_mutex_key -> namespace_sem
B. namespace_sem -> cgroup_mutex
B is from cgroup_show_options() and this patch breaks it by
introducing another mutex cgroup_root_mutex which nests inside
cgroup_mutex and protects cgroupfs_root.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Diffstat (limited to 'kernel/fork.c')
0 files changed, 0 insertions, 0 deletions