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Commit 8b92538d authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

jump_label: Add atomic_t interface 



Add an interface to allow usage of jump_labels with atomic counters.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20101014203625.501657727@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 3b6e901f

include/linux/jump_label_ref.h

0 → 100644
+44 −0
Original line number Diff line number Diff line 
#ifndef _LINUX_JUMP_LABEL_REF_H

#define _LINUX_JUMP_LABEL_REF_H



#include <linux/jump_label.h>

#include <asm/atomic.h>



#ifdef HAVE_JUMP_LABEL



static inline void jump_label_inc(atomic_t *key)

{

	if (atomic_add_return(1, key) == 1)

		jump_label_enable(key);

}



static inline void jump_label_dec(atomic_t *key)

{

	if (atomic_dec_and_test(key))

		jump_label_disable(key);

}



#else /* !HAVE_JUMP_LABEL */



static inline void jump_label_inc(atomic_t *key)

{

	atomic_inc(key);

}



static inline void jump_label_dec(atomic_t *key)

{

	atomic_dec(key);

}



#undef JUMP_LABEL

#define JUMP_LABEL(key, label)						\

do {									\

	if (unlikely(__builtin_choose_expr(				\

	      __builtin_types_compatible_p(typeof(key), atomic_t *),	\

	      atomic_read((atomic_t *)(key)), *(key))))			\

		goto label;						\

} while (0)



#endif /* HAVE_JUMP_LABEL */



#endif /* _LINUX_JUMP_LABEL_REF_H */