timers: Invoke timer_start_debug() where it makes sense

The timer start debug function is called before the proper timer base is
set. As a consequence the trace data contains the stale CPU and flags
values.

Call the debug function after setting the new base and flags.

Fixes: 500462a9de65 ("timers: Switch to a non-cascading wheel")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: stable@vger.kernel.org
Cc: rt@linutronix.de
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Anna-Maria Gleixner <anna-maria@linutronix.de>
Link: https://lkml.kernel.org/r/20171222145337.792907137@linutronix.de

1 files changed, 2 insertions, 2 deletions

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 6be576e02209..89a9e1b4264a 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1007,8 +1007,6 @@ __mod_timer(struct timer_list *timer, unsigned long expires, unsigned int option
         if (!ret && (options & MOD_TIMER_PENDING_ONLY))
                 goto out_unlock;
 
-        debug_activate(timer, expires);
-
         new_base = get_target_base(base, timer->flags);
 
         if (base != new_base) {
@@ -1032,6 +1030,8 @@ __mod_timer(struct timer_list *timer, unsigned long expires, unsigned int option
                 }
         }
 
+        debug_activate(timer, expires);
+
         timer->expires = expires;
         /*
          * If 'idx' was calculated above and the base time did not advance