sched: partly revert "sched debug: remove NULL checking in print_cfs_rt_rq()"

Impact: avoid accessing NULL tg.css->cgroup

In commit 0a0db8f5c9d4bbb9bbfcc2b6cb6bce2d0ef4d73d, I removed checking
NULL tg.css->cgroup, but I realized I was wrong when I found reading
/proc/sched_debug can race with cgroup_create().

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 4293cfa..16eeba4 100644 (file)
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -145,6 +145,19 @@ static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
        read_unlock_irqrestore(&tasklist_lock, flags);
 }
 
+#if defined(CONFIG_CGROUP_SCHED) && \
+       (defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED))
+static void task_group_path(struct task_group *tg, char *buf, int buflen)
+{
+       /* may be NULL if the underlying cgroup isn't fully-created yet */
+       if (!tg->css.cgroup) {
+               buf[0] = '\0';
+               return;
+       }
+       cgroup_path(tg->css.cgroup, buf, buflen);
+}
+#endif
+
 void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 {
        s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1,
@@ -154,10 +167,10 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
        unsigned long flags;
 
 #if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
-       char path[128] = "";
+       char path[128];
        struct task_group *tg = cfs_rq->tg;
 
-       cgroup_path(tg->css.cgroup, path, sizeof(path));
+       task_group_path(tg, path, sizeof(path));
 
        SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, path);
 #elif defined(CONFIG_USER_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
@@ -208,10 +221,10 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 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] = "";
+       char path[128];
        struct task_group *tg = rt_rq->tg;
 
-       cgroup_path(tg->css.cgroup, path, sizeof(path));
+       task_group_path(tg, path, sizeof(path));
 
        SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, path);
 #else