[PATCH] introduce WARN_ON_ONCE(cond)
[linux-2.6.git] / include / asm-generic / bug.h
1 #ifndef _ASM_GENERIC_BUG_H
2 #define _ASM_GENERIC_BUG_H
3
4 #include <linux/compiler.h>
5
6 #ifdef CONFIG_BUG
7 #ifndef HAVE_ARCH_BUG
8 #define BUG() do { \
9         printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __FUNCTION__); \
10         panic("BUG!"); \
11 } while (0)
12 #endif
13
14 #ifndef HAVE_ARCH_BUG_ON
15 #define BUG_ON(condition) do { if (unlikely((condition)!=0)) BUG(); } while(0)
16 #endif
17
18 #ifndef HAVE_ARCH_WARN_ON
19 #define WARN_ON(condition) do { \
20         if (unlikely((condition)!=0)) { \
21                 printk("BUG: warning at %s:%d/%s()\n", __FILE__, __LINE__, __FUNCTION__); \
22                 dump_stack(); \
23         } \
24 } while (0)
25 #endif
26
27 #else /* !CONFIG_BUG */
28 #ifndef HAVE_ARCH_BUG
29 #define BUG()
30 #endif
31
32 #ifndef HAVE_ARCH_BUG_ON
33 #define BUG_ON(condition) do { if (condition) ; } while(0)
34 #endif
35
36 #ifndef HAVE_ARCH_WARN_ON
37 #define WARN_ON(condition) do { if (condition) ; } while(0)
38 #endif
39 #endif
40
41 #define WARN_ON_ONCE(condition)                         \
42 ({                                                      \
43         static int __warn_once = 1;                     \
44         int __ret = 0;                                  \
45                                                         \
46         if (unlikely((condition) && __warn_once)) {     \
47                 __warn_once = 0;                        \
48                 WARN_ON(1);                             \
49                 __ret = 1;                              \
50         }                                               \
51         __ret;                                          \
52 })
53
54 #endif