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authorTejun Heo <tj@kernel.org>2013-08-08 20:11:27 -0400
committerTejun Heo <tj@kernel.org>2013-08-08 20:11:27 -0400
commitd99c8727e7bbc01b70e2c57e6127bfab26b868fd (patch)
tree9479ba1329ac1184cf82755ade7dfe94e9d7a4be /kernel/cgroup.c
parent81eeaf0411204f52af8ef78ff107cfca2fcfec1d (diff)
cgroup: make cgroup_taskset deal with cgroup_subsys_state instead of cgroup
cgroup is in the process of converting to css (cgroup_subsys_state) from cgroup as the principal subsystem interface handle. This is mostly to prepare for the unified hierarchy support where css's will be created and destroyed dynamically but also helps cleaning up subsystem implementations as css is usually what they are interested in anyway. cgroup_taskset which is used by the subsystem attach methods is the last cgroup subsystem API which isn't using css as the handle. Update cgroup_taskset_cur_cgroup() to cgroup_taskset_cur_css() and cgroup_taskset_for_each() to take @skip_css instead of @skip_cgrp. The conversions are pretty mechanical. One exception is cpuset::cgroup_cs(), which lost its last user and got removed. This patch shouldn't introduce any functional changes. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com> Acked-by: Daniel Wagner <daniel.wagner@bmw-carit.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Matt Helsley <matthltc@us.ibm.com> Cc: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/cgroup.c')
-rw-r--r--kernel/cgroup.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index a71f2e0f9711..e5bfb2a81dcb 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1907,18 +1907,20 @@ struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset)
EXPORT_SYMBOL_GPL(cgroup_taskset_next);
/**
- * cgroup_taskset_cur_cgroup - return the matching cgroup for the current task
+ * cgroup_taskset_cur_css - return the matching css for the current task
* @tset: taskset of interest
+ * @subsys_id: the ID of the target subsystem
*
- * Return the cgroup for the current (last returned) task of @tset. This
- * function must be preceded by either cgroup_taskset_first() or
- * cgroup_taskset_next().
+ * Return the css for the current (last returned) task of @tset for
+ * subsystem specified by @subsys_id. This function must be preceded by
+ * either cgroup_taskset_first() or cgroup_taskset_next().
*/
-struct cgroup *cgroup_taskset_cur_cgroup(struct cgroup_taskset *tset)
+struct cgroup_subsys_state *cgroup_taskset_cur_css(struct cgroup_taskset *tset,
+ int subsys_id)
{
- return tset->cur_cgrp;
+ return cgroup_css(tset->cur_cgrp, subsys_id);
}
-EXPORT_SYMBOL_GPL(cgroup_taskset_cur_cgroup);
+EXPORT_SYMBOL_GPL(cgroup_taskset_cur_css);
/**
* cgroup_taskset_size - return the number of tasks in taskset