Merge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
[linux-2.6.git] / include / linux / jump_label.h
1 #ifndef _LINUX_JUMP_LABEL_H
2 #define _LINUX_JUMP_LABEL_H
3
4 #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
5 # include <asm/jump_label.h>
6 # define HAVE_JUMP_LABEL
7 #endif
8
9 enum jump_label_type {
10         JUMP_LABEL_ENABLE,
11         JUMP_LABEL_DISABLE
12 };
13
14 struct module;
15
16 #ifdef HAVE_JUMP_LABEL
17
18 extern struct jump_entry __start___jump_table[];
19 extern struct jump_entry __stop___jump_table[];
20
21 extern void jump_label_lock(void);
22 extern void jump_label_unlock(void);
23 extern void arch_jump_label_transform(struct jump_entry *entry,
24                                  enum jump_label_type type);
25 extern void arch_jump_label_text_poke_early(jump_label_t addr);
26 extern void jump_label_update(unsigned long key, enum jump_label_type type);
27 extern void jump_label_apply_nops(struct module *mod);
28 extern int jump_label_text_reserved(void *start, void *end);
29
30 #define jump_label_enable(key) \
31         jump_label_update((unsigned long)key, JUMP_LABEL_ENABLE);
32
33 #define jump_label_disable(key) \
34         jump_label_update((unsigned long)key, JUMP_LABEL_DISABLE);
35
36 #else
37
38 #define JUMP_LABEL(key, label)                  \
39 do {                                            \
40         if (unlikely(*key))                     \
41                 goto label;                     \
42 } while (0)
43
44 #define jump_label_enable(cond_var)     \
45 do {                                    \
46        *(cond_var) = 1;                 \
47 } while (0)
48
49 #define jump_label_disable(cond_var)    \
50 do {                                    \
51        *(cond_var) = 0;                 \
52 } while (0)
53
54 static inline int jump_label_apply_nops(struct module *mod)
55 {
56         return 0;
57 }
58
59 static inline int jump_label_text_reserved(void *start, void *end)
60 {
61         return 0;
62 }
63
64 static inline void jump_label_lock(void) {}
65 static inline void jump_label_unlock(void) {}
66
67 #endif
68
69 #define COND_STMT(key, stmt)                                    \
70 do {                                                            \
71         __label__ jl_enabled;                                   \
72         JUMP_LABEL(key, jl_enabled);                            \
73         if (0) {                                                \
74 jl_enabled:                                                     \
75                 stmt;                                           \
76         }                                                       \
77 } while (0)
78
79 #endif