8b92538d84
Add an interface to allow usage of jump_labels with atomic counters. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20101014203625.501657727@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
45 lines
878 B
C
45 lines
878 B
C
#ifndef _LINUX_JUMP_LABEL_REF_H
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#define _LINUX_JUMP_LABEL_REF_H
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#include <linux/jump_label.h>
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#include <asm/atomic.h>
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#ifdef HAVE_JUMP_LABEL
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static inline void jump_label_inc(atomic_t *key)
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{
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if (atomic_add_return(1, key) == 1)
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jump_label_enable(key);
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}
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static inline void jump_label_dec(atomic_t *key)
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{
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if (atomic_dec_and_test(key))
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jump_label_disable(key);
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}
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#else /* !HAVE_JUMP_LABEL */
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static inline void jump_label_inc(atomic_t *key)
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{
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atomic_inc(key);
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}
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static inline void jump_label_dec(atomic_t *key)
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{
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atomic_dec(key);
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}
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#undef JUMP_LABEL
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#define JUMP_LABEL(key, label) \
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do { \
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if (unlikely(__builtin_choose_expr( \
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__builtin_types_compatible_p(typeof(key), atomic_t *), \
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atomic_read((atomic_t *)(key)), *(key)))) \
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goto label; \
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} while (0)
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#endif /* HAVE_JUMP_LABEL */
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#endif /* _LINUX_JUMP_LABEL_REF_H */
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