tick: broadcast-hrtimer: Remove overly clever return value abuse

The assignment of bc_moved in the conditional construct relies on the
fact that in the case of hrtimer_start() invocation the return value
is always 0. It took me a while to understand it.

We want to get rid of the hrtimer_start() return value. Open code the
logic which makes it readable as well.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/20150414203503.404751457@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/kernel/time/tick-broadcast-hrtimer.c b/kernel/time/tick-broadcast-hrtimer.c
index 6aac4be..96428d7 100644 (file)
--- a/kernel/time/tick-broadcast-hrtimer.c
+++ b/kernel/time/tick-broadcast-hrtimer.c
@@ -66,9 +66,11 @@ static int bc_set_next(ktime_t expires, struct clock_event_device *bc)
         * hrtimer_{start/cancel} functions call into tracing,
         * calls to these functions must be bound within RCU_NONIDLE.
         */
-       RCU_NONIDLE(bc_moved = (hrtimer_try_to_cancel(&bctimer) >= 0) ?
-               !hrtimer_start(&bctimer, expires, HRTIMER_MODE_ABS_PINNED) :
-                       0);
+       RCU_NONIDLE({
+                       bc_moved = hrtimer_try_to_cancel(&bctimer) >= 0;
+                       if (bc_moved)
+                               hrtimer_start(&bctimer, expires,
+                                             HRTIMER_MODE_ABS_PINNED);});
        if (bc_moved) {
                /* Bind the "device" to the cpu */
                bc->bound_on = smp_processor_id();