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authorTejun Heo <tj@kernel.org>2014-02-08 10:36:58 -0500
committerTejun Heo <tj@kernel.org>2014-02-08 10:36:58 -0500
commit073219e995b4a3f8cf1ce8228b7ef440b6994ac0 (patch)
treed140fc2e94bd8fd09270286b7267fb087a79f288 /security
parent3ed80a62bf959d34ebd4d553b026fbe7e6fbcc54 (diff)
downloadlinux-073219e995b4a3f8cf1ce8228b7ef440b6994ac0.tar.gz
cgroup: clean up cgroup_subsys names and initialization
cgroup_subsys is a bit messier than it needs to be. * The name of a subsys can be different from its internal identifier defined in cgroup_subsys.h. Most subsystems use the matching name but three - cpu, memory and perf_event - use different ones. * cgroup_subsys_id enums are postfixed with _subsys_id and each cgroup_subsys is postfixed with _subsys. cgroup.h is widely included throughout various subsystems, it doesn't and shouldn't have claim on such generic names which don't have any qualifier indicating that they belong to cgroup. * cgroup_subsys->subsys_id should always equal the matching cgroup_subsys_id enum; however, we require each controller to initialize it and then BUG if they don't match, which is a bit silly. This patch cleans up cgroup_subsys names and initialization by doing the followings. * cgroup_subsys_id enums are now postfixed with _cgrp_id, and each cgroup_subsys with _cgrp_subsys. * With the above, renaming subsys identifiers to match the userland visible names doesn't cause any naming conflicts. All non-matching identifiers are renamed to match the official names. cpu_cgroup -> cpu mem_cgroup -> memory perf -> perf_event * controllers no longer need to initialize ->subsys_id and ->name. They're generated in cgroup core and set automatically during boot. * Redundant cgroup_subsys declarations removed. * While updating BUG_ON()s in cgroup_init_early(), convert them to WARN()s. BUGging that early during boot is stupid - the kernel can't print anything, even through serial console and the trap handler doesn't even link stack frame properly for back-tracing. This patch doesn't introduce any behavior changes. v2: Rebased on top of fe1217c4f3f7 ("net: net_cls: move cgroupfs classid handling into core"). Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Neil Horman <nhorman@tuxdriver.com> Acked-by: "David S. Miller" <davem@davemloft.net> Acked-by: "Rafael J. Wysocki" <rjw@rjwysocki.net> Acked-by: Michal Hocko <mhocko@suse.cz> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Aristeu Rozanski <aris@redhat.com> Acked-by: Ingo Molnar <mingo@redhat.com> Acked-by: Li Zefan <lizefan@huawei.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Balbir Singh <bsingharora@gmail.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Serge E. Hallyn <serue@us.ibm.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Thomas Graf <tgraf@suug.ch>
Diffstat (limited to 'security')
-rw-r--r--security/device_cgroup.c8
1 files changed, 2 insertions, 6 deletions
diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index d3b6d2cd3a0..7f88bcde7c6 100644
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -58,11 +58,9 @@ static inline struct dev_cgroup *css_to_devcgroup(struct cgroup_subsys_state *s)
static inline struct dev_cgroup *task_devcgroup(struct task_struct *task)
{
- return css_to_devcgroup(task_css(task, devices_subsys_id));
+ return css_to_devcgroup(task_css(task, devices_cgrp_id));
}
-struct cgroup_subsys devices_subsys;
-
/*
* called under devcgroup_mutex
*/
@@ -684,13 +682,11 @@ static struct cftype dev_cgroup_files[] = {
{ } /* terminate */
};
-struct cgroup_subsys devices_subsys = {
- .name = "devices",
+struct cgroup_subsys devices_cgrp_subsys = {
.css_alloc = devcgroup_css_alloc,
.css_free = devcgroup_css_free,
.css_online = devcgroup_online,
.css_offline = devcgroup_offline,
- .subsys_id = devices_subsys_id,
.base_cftypes = dev_cgroup_files,
};