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| author | Jiri Kosina | 2010-08-04 15:14:38 +0200 |
|---|---|---|
| committer | Jiri Kosina | 2010-08-04 15:14:38 +0200 |
| commit | d790d4d583aeaed9fc6f8a9f4d9f8ce6b1c15c7f (patch) | |
| tree | 854ab394486288d40fa8179cbfaf66e8bdc44b0f /include/linux/cgroup.h | |
| parent | fix comment typo "choosed" -> "chosen" (diff) | |
| parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw (diff) | |
| download | kernel-qcow2-linux-d790d4d583aeaed9fc6f8a9f4d9f8ce6b1c15c7f.tar.gz kernel-qcow2-linux-d790d4d583aeaed9fc6f8a9f4d9f8ce6b1c15c7f.tar.xz kernel-qcow2-linux-d790d4d583aeaed9fc6f8a9f4d9f8ce6b1c15c7f.zip | |
Merge branch 'master' into for-next
Diffstat (limited to 'include/linux/cgroup.h')
| -rw-r--r-- | include/linux/cgroup.h | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 0c621604baa1..e3d00fdb858d 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -525,13 +525,21 @@ static inline struct cgroup_subsys_state *cgroup_subsys_state( return cgrp->subsys[subsys_id]; } -static inline struct cgroup_subsys_state *task_subsys_state( - struct task_struct *task, int subsys_id) +/* + * function to get the cgroup_subsys_state which allows for extra + * rcu_dereference_check() conditions, such as locks used during the + * cgroup_subsys::attach() methods. + */ +#define task_subsys_state_check(task, subsys_id, __c) \ + rcu_dereference_check(task->cgroups->subsys[subsys_id], \ + rcu_read_lock_held() || \ + lockdep_is_held(&task->alloc_lock) || \ + cgroup_lock_is_held() || (__c)) + +static inline struct cgroup_subsys_state * +task_subsys_state(struct task_struct *task, int subsys_id) { - return rcu_dereference_check(task->cgroups->subsys[subsys_id], - rcu_read_lock_held() || - lockdep_is_held(&task->alloc_lock) || - cgroup_lock_is_held()); + return task_subsys_state_check(task, subsys_id, false); } static inline struct cgroup* task_cgroup(struct task_struct *task, |