[tip:timers/urgent] nohz: Print more debug info in tick_nohz_stop_sched_tick()

[tip-bot for Frederic Weisbecker <tipbot@zytor.com>]

Commit-ID:  098991fccfc7c0dd5fdfc6ed2ed965ad80f14be5
Gitweb:     http://git.kernel.org/tip/098991fccfc7c0dd5fdfc6ed2ed965ad80f14be5
Author:     Frederic Weisbecker <fweisbec@gmail.com>
AuthorDate: Mon, 24 Apr 2017 16:04:37 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 24 Apr 2017 16:27:09 +0200

nohz: Print more debug info in tick_nohz_stop_sched_tick()

Print more debug info when triggering this warning:

  > ------------[ cut here ]------------
  > WARNING: CPU: 0 PID: 0 at kernel/time/tick-sched.c:874 __tick_nohz_idle_enter+0x461/0x490

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: James Hartsock <hartsjc@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tim Wright <tim@binbash.co.uk>
Link: http://lkml.kernel.org/r/20170424140436.GD21353@lerouge
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 kernel/time/tick-sched.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index be7ca4d..b2df684 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -789,6 +789,7 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
 			goto out;
 
 		WARN_ON_ONCE(1);
+		printk_once("basemono: %llu ts->next_tick: %llu dev->next_event: %llu\n", basemono, ts->next_tick, dev->next_event);
 	}
 
 	/*