sched debug: remove NULL checking in print_cfs/rt_rq()

Impact: cleanup

cfs->tg is initialized in init_tg_cfs_entry() with tg != NULL, and
will never be invalidated to NULL. And the underlying cgroup of a
valid task_group is always valid.

Same for rt->tg.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 5ae1776..d25cefe 100644 (file)
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -121,14 +121,9 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 
 #if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
        char path[128] = "";
-       struct cgroup *cgroup = NULL;
        struct task_group *tg = cfs_rq->tg;
 
-       if (tg)
-               cgroup = tg->css.cgroup;
-
-       if (cgroup)
-               cgroup_path(cgroup, path, sizeof(path));
+       cgroup_path(tg->css.cgroup, path, sizeof(path));
 
        SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, path);
 #else
@@ -193,14 +188,9 @@ void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
 {
 #if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_RT_GROUP_SCHED)
        char path[128] = "";
-       struct cgroup *cgroup = NULL;
        struct task_group *tg = rt_rq->tg;
 
-       if (tg)
-               cgroup = tg->css.cgroup;
-
-       if (cgroup)
-               cgroup_path(cgroup, path, sizeof(path));
+       cgroup_path(tg->css.cgroup, path, sizeof(path));
 
        SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, path);
 #else