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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2010-10-14 15:39:02 -0400
committerIngo Molnar <mingo@elte.hu>2010-10-18 13:58:57 -0400
commit8b92538d84e50062560ba33adbaed7887b6e4a42 (patch)
tree7db3977261fdd71916c45419da404c16ce85838c
parent3b6e901f839f42afb40f614418df82c08b01320a (diff)
jump_label: Add atomic_t interface
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>
-rw-r--r--include/linux/jump_label_ref.h44
1 files changed, 44 insertions, 0 deletions
diff --git a/include/linux/jump_label_ref.h b/include/linux/jump_label_ref.h
new file mode 100644
index 00000000000..e5d012ad92c
--- /dev/null
+++ b/include/linux/jump_label_ref.h
@@ -0,0 +1,44 @@
1#ifndef _LINUX_JUMP_LABEL_REF_H
2#define _LINUX_JUMP_LABEL_REF_H
3
4#include <linux/jump_label.h>
5#include <asm/atomic.h>
6
7#ifdef HAVE_JUMP_LABEL
8
9static inline void jump_label_inc(atomic_t *key)
10{
11 if (atomic_add_return(1, key) == 1)
12 jump_label_enable(key);
13}
14
15static inline void jump_label_dec(atomic_t *key)
16{
17 if (atomic_dec_and_test(key))
18 jump_label_disable(key);
19}
20
21#else /* !HAVE_JUMP_LABEL */
22
23static inline void jump_label_inc(atomic_t *key)
24{
25 atomic_inc(key);
26}
27
28static inline void jump_label_dec(atomic_t *key)
29{
30 atomic_dec(key);
31}
32
33#undef JUMP_LABEL
34#define JUMP_LABEL(key, label) \
35do { \
36 if (unlikely(__builtin_choose_expr( \
37 __builtin_types_compatible_p(typeof(key), atomic_t *), \
38 atomic_read((atomic_t *)(key)), *(key)))) \
39 goto label; \
40} while (0)
41
42#endif /* HAVE_JUMP_LABEL */
43
44#endif /* _LINUX_JUMP_LABEL_REF_H */