cgroup: add/update accessors which obtain subsys specific data from css

css (cgroup_subsys_state) is usually embedded in a subsys specific
data structure.  Subsystems either use container_of() directly to cast
from css to such data structure or has an accessor function wrapping
such cast.  As cgroup as whole is moving towards using css as the main
interface handle, add and update such accessors to ease dealing with
css's.

All accessors explicitly handle NULL input and return NULL in those
cases.  While this looks like an extra branch in the code, as all
controllers specific data structures have css as the first field, the
casting doesn't involve any offsetting and the compiler can trivially
optimize out the branch.

* blkio, freezer, cpuset, cpu, cpuacct and net_cls didn't have such
  accessor.  Added.

* memory, hugetlb and devices already had one but didn't explicitly
  handle NULL input.  Updated.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index f7371341d42a..6e9cbdde25bd 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -114,18 +114,21 @@ struct cpuset {
         int relax_domain_level;
 };
 
+static inline struct cpuset *css_cs(struct cgroup_subsys_state *css)
+{
+        return css ? container_of(css, struct cpuset, css) : NULL;
+}
+
 /* Retrieve the cpuset for a cgroup */
 static inline struct cpuset *cgroup_cs(struct cgroup *cgrp)
 {
-        return container_of(cgroup_css(cgrp, cpuset_subsys_id),
-                            struct cpuset, css);
+        return css_cs(cgroup_css(cgrp, cpuset_subsys_id));
 }
 
 /* Retrieve the cpuset for a task */
 static inline struct cpuset *task_cs(struct task_struct *task)
 {
-        return container_of(task_css(task, cpuset_subsys_id),
-                            struct cpuset, css);
+        return css_cs(task_css(task, cpuset_subsys_id));
 }
 
 static inline struct cpuset *parent_cs(struct cpuset *cs)