Commit 805194c3 authored by Li Zefan's avatar Li Zefan Committed by Ingo Molnar

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

Impact: avoid accessing NULL tg.css->cgroup

In commit 0a0db8f5, 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: default avatarLi Zefan <lizf@cn.fujitsu.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 62ea9ceb
...@@ -145,6 +145,19 @@ static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu) ...@@ -145,6 +145,19 @@ static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
read_unlock_irqrestore(&tasklist_lock, flags); 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) void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
{ {
s64 MIN_vruntime = -1, min_vruntime, max_vruntime = -1, 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) ...@@ -154,10 +167,10 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
unsigned long flags; unsigned long flags;
#if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED) #if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED)
char path[128] = ""; char path[128];
struct task_group *tg = cfs_rq->tg; 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); SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, path);
#elif defined(CONFIG_USER_SCHED) && defined(CONFIG_FAIR_GROUP_SCHED) #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) ...@@ -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) 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) #if defined(CONFIG_CGROUP_SCHED) && defined(CONFIG_RT_GROUP_SCHED)
char path[128] = ""; char path[128];
struct task_group *tg = rt_rq->tg; 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); SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, path);
#else #else
......
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