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8b92538d PZ |
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 | ||
9 | static inline void jump_label_inc(atomic_t *key) | |
10 | { | |
11 | if (atomic_add_return(1, key) == 1) | |
12 | jump_label_enable(key); | |
13 | } | |
14 | ||
15 | static 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 | ||
23 | static inline void jump_label_inc(atomic_t *key) | |
24 | { | |
25 | atomic_inc(key); | |
26 | } | |
27 | ||
28 | static 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) \ | |
35 | do { \ | |
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 */ |