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-rw-r--r--kernel/cpuset.c11
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)