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| author | Tejun Heo | 2014-05-13 17:30:04 +0200 |
|---|---|---|
| committer | Tejun Heo | 2014-05-13 17:30:04 +0200 |
| commit | f21a4f7594a122dcaabc08ce03bfb63fdc34de1b (patch) | |
| tree | bdce189dc55f875e5466c31374c52b48f4ba4db0 /include/linux/cgroup.h | |
| parent | Merge branch 'for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/p... (diff) | |
| parent | cgroup: fix rcu_read_lock() leak in update_if_frozen() (diff) | |
| download | kernel-qcow2-linux-f21a4f7594a122dcaabc08ce03bfb63fdc34de1b.tar.gz kernel-qcow2-linux-f21a4f7594a122dcaabc08ce03bfb63fdc34de1b.tar.xz kernel-qcow2-linux-f21a4f7594a122dcaabc08ce03bfb63fdc34de1b.zip | |
Merge branch 'for-3.15-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup into for-3.16
Pull to receive e37a06f10994 ("cgroup: fix the retry path of
cgroup_mount()") to avoid unnecessary conflicts with planned
cgroup_tree_mutex removal and also to be able to remove the temp fix
added by 36c38fb7144a ("blkcg: use trylock on blkcg_pol_mutex in
blkcg_reset_stats()") afterwards.
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'include/linux/cgroup.h')
| -rw-r--r-- | include/linux/cgroup.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 6ab3ee5d4a14..bde44618d8c2 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -521,6 +521,7 @@ struct cftype { }; extern struct cgroup_root cgrp_dfl_root; +extern struct css_set init_css_set; static inline bool cgroup_on_dfl(const struct cgroup *cgrp) { @@ -751,6 +752,20 @@ static inline struct cgroup_subsys_state *task_css(struct task_struct *task, return task_css_check(task, subsys_id, false); } +/** + * task_css_is_root - test whether a task belongs to the root css + * @task: the target task + * @subsys_id: the target subsystem ID + * + * Test whether @task belongs to the root css on the specified subsystem. + * May be invoked in any context. + */ +static inline bool task_css_is_root(struct task_struct *task, int subsys_id) +{ + return task_css_check(task, subsys_id, true) == + init_css_set.subsys[subsys_id]; +} + static inline struct cgroup *task_cgroup(struct task_struct *task, int subsys_id) { |