diff options
Diffstat (limited to 'include/linux/cgroup.h')
| -rw-r--r-- | include/linux/cgroup.h | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 76dadd77a120..1737db0c63fe 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -77,6 +77,7 @@ struct cgroup_subsys_state { /* bits in struct cgroup_subsys_state flags field */ enum { + CSS_NO_REF = (1 << 0), /* no reference counting for this css */ CSS_ONLINE = (1 << 1), /* between ->css_online() and ->css_offline() */ }; @@ -88,7 +89,8 @@ enum { */ static inline void css_get(struct cgroup_subsys_state *css) { - percpu_ref_get(&css->refcnt); + if (!(css->flags & CSS_NO_REF)) + percpu_ref_get(&css->refcnt); } /** @@ -103,7 +105,9 @@ static inline void css_get(struct cgroup_subsys_state *css) */ static inline bool css_tryget_online(struct cgroup_subsys_state *css) { - return percpu_ref_tryget_live(&css->refcnt); + if (!(css->flags & CSS_NO_REF)) + return percpu_ref_tryget_live(&css->refcnt); + return true; } /** @@ -114,7 +118,8 @@ static inline bool css_tryget_online(struct cgroup_subsys_state *css) */ static inline void css_put(struct cgroup_subsys_state *css) { - percpu_ref_put(&css->refcnt); + if (!(css->flags & CSS_NO_REF)) + percpu_ref_put(&css->refcnt); } /* bits in struct cgroup flags field */ |