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[RFC][PATCH 2/4] sched/clock: Update static_key usage

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  [RFC][PATCH 2/4] sched/clock: Update static_key usage Peter Zijlstra <peterz@infradead.org> - 2016-12-15 14:20 +0100

#1542721 — [RFC][PATCH 2/4] sched/clock: Update static_key usage

sched_clock was still using the deprecated static_key interface.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 kernel/sched/clock.c |   12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

--- a/kernel/sched/clock.c
+++ b/kernel/sched/clock.c
@@ -78,19 +78,17 @@ EXPORT_SYMBOL_GPL(sched_clock);
 __read_mostly int sched_clock_running;
 
 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
-static struct static_key __sched_clock_stable = STATIC_KEY_INIT;
+static DEFINE_STATIC_KEY_FALSE(__sched_clock_stable);
 static int __sched_clock_stable_early;
 
 int sched_clock_stable(void)
 {
-	return static_key_false(&__sched_clock_stable);
+	return static_branch_likely(&__sched_clock_stable);
 }
 
 static void __set_sched_clock_stable(void)
 {
-	if (!sched_clock_stable())
-		static_key_slow_inc(&__sched_clock_stable);
-
+	static_branch_enable(&__sched_clock_stable);
 	tick_dep_clear(TICK_DEP_BIT_CLOCK_UNSTABLE);
 }
 
@@ -109,9 +107,7 @@ void set_sched_clock_stable(void)
 static void __clear_sched_clock_stable(struct work_struct *work)
 {
 	/* XXX worry about clock continuity */
-	if (sched_clock_stable())
-		static_key_slow_dec(&__sched_clock_stable);
-
+	static_branch_disable(&__sched_clock_stable);
 	tick_dep_set(TICK_DEP_BIT_CLOCK_UNSTABLE);
 }
 

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