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Commit e33886b3 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

locking/static_keys: Add static_key_{en,dis}able() helpers 



Add two helpers to make it easier to treat the refcount as boolean.

Suggested-by: default avatarJason Baron <jasonbaron0@gmail.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 7dcfd915

include/linux/jump_label.h

+20 −0
Original line number Diff line number Diff line
@@ -198,6 +198,26 @@ static inline bool static_key_enabled(struct static_key *key) 
	return static_key_count(key) > 0;

}



static inline void static_key_enable(struct static_key *key)

{

	int count = static_key_count(key);



	WARN_ON_ONCE(count < 0 || count > 1);



	if (!count)

		static_key_slow_inc(key);

}



static inline void static_key_disable(struct static_key *key)

{

	int count = static_key_count(key);



	WARN_ON_ONCE(count < 0 || count > 1);



	if (count)

		static_key_slow_dec(key);

}



#endif	/* _LINUX_JUMP_LABEL_H */



#endif /* __ASSEMBLY__ */

kernel/sched/core.c

+2 −4
Original line number Diff line number Diff line
@@ -164,14 +164,12 @@ struct static_key sched_feat_keys[__SCHED_FEAT_NR] = { 


static void sched_feat_disable(int i)

{

	if (static_key_enabled(&sched_feat_keys[i]))

		static_key_slow_dec(&sched_feat_keys[i]);

	static_key_disable(&sched_feat_keys[i]);

}



static void sched_feat_enable(int i)

{

	if (!static_key_enabled(&sched_feat_keys[i]))

		static_key_slow_inc(&sched_feat_keys[i]);

	static_key_enable(&sched_feat_keys[i]);

}

#else

static void sched_feat_disable(int i) { };