[tip:sched/core] sched/clock: Remove pointless test in cpu_clock/local_clock

[tip-bot for Daniel Lezcano]

Commit-ID:  c78b17e28cc2c2df74264afc408bdc6aaf3fbcc8
Gitweb:     http://git.kernel.org/tip/c78b17e28cc2c2df74264afc408bdc6aaf3fbcc8
Author:     Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
AuthorDate: Mon, 11 Apr 2016 16:38:33 +0200
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 13 Apr 2016 12:25:22 +0200

sched/clock: Remove pointless test in cpu_clock/local_clock

In case the HAVE_UNSTABLE_SCHED_CLOCK config is set, the cpu_clock() version
checks if sched_clock_stable() is not set and calls sched_clock_cpu(),
otherwise it calls sched_clock().

sched_clock_cpu() checks also if sched_clock_stable() is set and, if true,
calls sched_clock().

sched_clock() will be called in sched_clock_cpu() if sched_clock_stable() is
true.

Remove the duplicate test by directly calling sched_clock_cpu() and let the
static key act in this function instead.

Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1460385514-14700-1-git-send-email-daniel.lezcano@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 kernel/sched/clock.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/kernel/sched/clock.c b/kernel/sched/clock.c
index fedb967..30c4b20 100644
--- a/kernel/sched/clock.c
+++ b/kernel/sched/clock.c
@@ -375,10 +375,7 @@ EXPORT_SYMBOL_GPL(sched_clock_idle_wakeup_event);
  */
 u64 cpu_clock(int cpu)
 {
-	if (!sched_clock_stable())
-		return sched_clock_cpu(cpu);
-
-	return sched_clock();
+	return sched_clock_cpu(cpu);
 }
 
 /*
@@ -390,10 +387,7 @@ u64 cpu_clock(int cpu)
  */
 u64 local_clock(void)
 {
-	if (!sched_clock_stable())
-		return sched_clock_cpu(raw_smp_processor_id());
-
-	return sched_clock();
+	return sched_clock_cpu(raw_smp_processor_id());
 }
 
 #else /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */