nohz: Remove ts->Einidle checks before restarting the tick

ts->inidle is set by tick_nohz_idle_enter() and unset by
tick_nohz_idle_exit(). However these two calls are assumed
to be always paired. This means that by the time we call
tick_nohz_idle_exit(), ts->inidle is supposed to be always
set to 1.

Remove the checks for ts->inidle in tick_nohz_idle_exit().
This simplifies a bit the code and improves its debuggability
(ie: ensure the call is paired with a tick_nohz_idle_enter()
call).

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Reviewed-by: Yong Zhang <yong.zhang0@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Ingo Molnar <mingo@elte.hu>
Link: http://lkml.kernel.org/r/1327427984-23282-2-git-send-email-fweisbec@gmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 6 insertions, 5 deletions

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 8cfffd9d9ce9..3526038f2836 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -558,20 +558,21 @@ void tick_nohz_idle_exit(void)
 
         local_irq_disable();
 
-        if (ts->idle_active || (ts->inidle && ts->tick_stopped))
+        WARN_ON_ONCE(!ts->inidle);
+
+        ts->inidle = 0;
+
+        if (ts->idle_active || ts->tick_stopped)
                 now = ktime_get();
 
         if (ts->idle_active)
                 tick_nohz_stop_idle(cpu, now);
 
-        if (!ts->inidle || !ts->tick_stopped) {
-                ts->inidle = 0;
+        if (!ts->tick_stopped) {
                 local_irq_enable();
                 return;
         }
 
-        ts->inidle = 0;
-
         /* Update jiffies first */
         select_nohz_load_balancer(0);
         tick_do_update_jiffies64(now);