diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/cgroup.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index e6ab2f1e6f8b..f3b356ee66d6 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -547,6 +547,23 @@ static inline bool cgroup_is_descendant(struct cgroup *cgrp, return cgrp->ancestor_ids[ancestor->level] == ancestor->id; } +/** + * task_under_cgroup_hierarchy - test task's membership of cgroup ancestry + * @task: the task to be tested + * @ancestor: possible ancestor of @task's cgroup + * + * Tests whether @task's default cgroup hierarchy is a descendant of @ancestor. + * It follows all the same rules as cgroup_is_descendant, and only applies + * to the default hierarchy. + */ +static inline bool task_under_cgroup_hierarchy(struct task_struct *task, + struct cgroup *ancestor) +{ + struct css_set *cset = task_css_set(task); + + return cgroup_is_descendant(cset->dfl_cgrp, ancestor); +} + /* no synchronization, the result can only be used as a hint */ static inline bool cgroup_is_populated(struct cgroup *cgrp) { @@ -637,6 +654,7 @@ int subsys_cgroup_allow_attach(struct cgroup_subsys_state *css, #else /* !CONFIG_CGROUPS */ struct cgroup_subsys_state; +struct cgroup; static inline void css_put(struct cgroup_subsys_state *css) {} static inline int cgroup_attach_task_all(struct task_struct *from, @@ -653,6 +671,13 @@ static inline void cgroup_free(struct task_struct *p) {} static inline int cgroup_init_early(void) { return 0; } static inline int cgroup_init(void) { return 0; } + +static inline bool task_under_cgroup_hierarchy(struct task_struct *task, + struct cgroup *ancestor) +{ + return true; +} + static inline void cgroup_init_kthreadd(void) {} static inline void cgroup_kthread_ready(void) {} |