sched: Don't use tasklist_lock for debug prints

Avoid taking locks from debug prints, this avoids latencies on -rt,
and improves reliability of the debug code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 2 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index ce9a9e7db116..24637c782002 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6021,7 +6021,7 @@ void show_state_filter(unsigned long state_filter)
         printk(KERN_INFO
                 "  task                        PC stack   pid father\n");
 #endif
-        read_lock(&tasklist_lock);
+        rcu_read_lock();
         do_each_thread(g, p) {
                 /*
                  * reset the NMI-timeout, listing all files on a slow
@@ -6037,7 +6037,7 @@ void show_state_filter(unsigned long state_filter)
 #ifdef CONFIG_SCHED_DEBUG
         sysrq_sched_debug_show();
 #endif
-        read_unlock(&tasklist_lock);
+        rcu_read_unlock();
         /*
          * Only show locks if all tasks are dumped:
          */