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1da177e4 LT |
1 | #ifndef _ASM_GENERIC_BUG_H |
2 | #define _ASM_GENERIC_BUG_H | |
3 | ||
4 | #include <linux/compiler.h> | |
1da177e4 | 5 | |
c8538a7a | 6 | #ifdef CONFIG_BUG |
7664c5a1 JF |
7 | |
8 | #ifdef CONFIG_GENERIC_BUG | |
9 | #ifndef __ASSEMBLY__ | |
10 | struct bug_entry { | |
b93a531e | 11 | #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS |
7664c5a1 | 12 | unsigned long bug_addr; |
b93a531e JB |
13 | #else |
14 | signed int bug_addr_disp; | |
15 | #endif | |
7664c5a1 | 16 | #ifdef CONFIG_DEBUG_BUGVERBOSE |
b93a531e | 17 | #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS |
7664c5a1 | 18 | const char *file; |
b93a531e JB |
19 | #else |
20 | signed int file_disp; | |
21 | #endif | |
7664c5a1 JF |
22 | unsigned short line; |
23 | #endif | |
24 | unsigned short flags; | |
25 | }; | |
26 | #endif /* __ASSEMBLY__ */ | |
27 | ||
b2be0527 BH |
28 | #define BUGFLAG_WARNING (1 << 0) |
29 | #define BUGFLAG_TAINT(taint) (BUGFLAG_WARNING | ((taint) << 8)) | |
30 | #define BUG_GET_TAINT(bug) ((bug)->flags >> 8) | |
31 | ||
7664c5a1 JF |
32 | #endif /* CONFIG_GENERIC_BUG */ |
33 | ||
af9379c7 DB |
34 | /* |
35 | * Don't use BUG() or BUG_ON() unless there's really no way out; one | |
36 | * example might be detecting data structure corruption in the middle | |
37 | * of an operation that can't be backed out of. If the (sub)system | |
38 | * can somehow continue operating, perhaps with reduced functionality, | |
39 | * it's probably not BUG-worthy. | |
40 | * | |
41 | * If you're tempted to BUG(), think again: is completely giving up | |
42 | * really the *only* solution? There are usually better options, where | |
43 | * users don't need to reboot ASAP and can mostly shut down cleanly. | |
44 | */ | |
1da177e4 LT |
45 | #ifndef HAVE_ARCH_BUG |
46 | #define BUG() do { \ | |
d5c003b4 | 47 | printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \ |
1da177e4 LT |
48 | panic("BUG!"); \ |
49 | } while (0) | |
50 | #endif | |
51 | ||
1da177e4 | 52 | #ifndef HAVE_ARCH_BUG_ON |
2a41de48 | 53 | #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while(0) |
1da177e4 LT |
54 | #endif |
55 | ||
af9379c7 DB |
56 | /* |
57 | * WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report | |
58 | * significant issues that need prompt attention if they should ever | |
59 | * appear at runtime. Use the versions with printk format strings | |
60 | * to provide better diagnostics. | |
61 | */ | |
b2be0527 | 62 | #ifndef __WARN_TAINT |
79b4cc5e | 63 | #ifndef __ASSEMBLY__ |
57adc4d2 | 64 | extern void warn_slowpath_fmt(const char *file, const int line, |
a8f18b90 | 65 | const char *fmt, ...) __attribute__((format(printf, 3, 4))); |
b2be0527 BH |
66 | extern void warn_slowpath_fmt_taint(const char *file, const int line, |
67 | unsigned taint, const char *fmt, ...) | |
68 | __attribute__((format(printf, 4, 5))); | |
57adc4d2 | 69 | extern void warn_slowpath_null(const char *file, const int line); |
79b4cc5e AV |
70 | #define WANT_WARN_ON_SLOWPATH |
71 | #endif | |
57adc4d2 AK |
72 | #define __WARN() warn_slowpath_null(__FILE__, __LINE__) |
73 | #define __WARN_printf(arg...) warn_slowpath_fmt(__FILE__, __LINE__, arg) | |
b2be0527 BH |
74 | #define __WARN_printf_taint(taint, arg...) \ |
75 | warn_slowpath_fmt_taint(__FILE__, __LINE__, taint, arg) | |
a8f18b90 | 76 | #else |
b2be0527 | 77 | #define __WARN() __WARN_TAINT(TAINT_WARN) |
ec5679e5 | 78 | #define __WARN_printf(arg...) do { printk(arg); __WARN(); } while (0) |
b2be0527 BH |
79 | #define __WARN_printf_taint(taint, arg...) \ |
80 | do { printk(arg); __WARN_TAINT(taint); } while (0) | |
3a6a62f9 OJ |
81 | #endif |
82 | ||
83 | #ifndef WARN_ON | |
684f9783 | 84 | #define WARN_ON(condition) ({ \ |
8d4fbcfb | 85 | int __ret_warn_on = !!(condition); \ |
3a6a62f9 OJ |
86 | if (unlikely(__ret_warn_on)) \ |
87 | __WARN(); \ | |
684f9783 HX |
88 | unlikely(__ret_warn_on); \ |
89 | }) | |
1da177e4 LT |
90 | #endif |
91 | ||
a8f18b90 AV |
92 | #ifndef WARN |
93 | #define WARN(condition, format...) ({ \ | |
94 | int __ret_warn_on = !!(condition); \ | |
95 | if (unlikely(__ret_warn_on)) \ | |
96 | __WARN_printf(format); \ | |
97 | unlikely(__ret_warn_on); \ | |
98 | }) | |
99 | #endif | |
100 | ||
b2be0527 BH |
101 | #define WARN_TAINT(condition, taint, format...) ({ \ |
102 | int __ret_warn_on = !!(condition); \ | |
103 | if (unlikely(__ret_warn_on)) \ | |
104 | __WARN_printf_taint(taint, format); \ | |
105 | unlikely(__ret_warn_on); \ | |
106 | }) | |
107 | ||
c8538a7a MM |
108 | #else /* !CONFIG_BUG */ |
109 | #ifndef HAVE_ARCH_BUG | |
da60682c | 110 | #define BUG() do {} while(0) |
c8538a7a MM |
111 | #endif |
112 | ||
c8538a7a MM |
113 | #ifndef HAVE_ARCH_BUG_ON |
114 | #define BUG_ON(condition) do { if (condition) ; } while(0) | |
115 | #endif | |
116 | ||
117 | #ifndef HAVE_ARCH_WARN_ON | |
8c7c7c9b | 118 | #define WARN_ON(condition) ({ \ |
8d4fbcfb | 119 | int __ret_warn_on = !!(condition); \ |
8c7c7c9b RB |
120 | unlikely(__ret_warn_on); \ |
121 | }) | |
c8538a7a | 122 | #endif |
a8f18b90 AV |
123 | |
124 | #ifndef WARN | |
125 | #define WARN(condition, format...) ({ \ | |
126 | int __ret_warn_on = !!(condition); \ | |
127 | unlikely(__ret_warn_on); \ | |
128 | }) | |
129 | #endif | |
130 | ||
b2be0527 BH |
131 | #define WARN_TAINT(condition, taint, format...) WARN_ON(condition) |
132 | ||
c8538a7a MM |
133 | #endif |
134 | ||
d69a8922 | 135 | #define WARN_ON_ONCE(condition) ({ \ |
42f247c8 | 136 | static bool __warned; \ |
8d4fbcfb | 137 | int __ret_warn_once = !!(condition); \ |
d69a8922 AM |
138 | \ |
139 | if (unlikely(__ret_warn_once)) \ | |
140 | if (WARN_ON(!__warned)) \ | |
42f247c8 | 141 | __warned = true; \ |
d69a8922 | 142 | unlikely(__ret_warn_once); \ |
74bb6a09 IM |
143 | }) |
144 | ||
45e9c0de | 145 | #define WARN_ONCE(condition, format...) ({ \ |
42f247c8 | 146 | static bool __warned; \ |
45e9c0de AV |
147 | int __ret_warn_once = !!(condition); \ |
148 | \ | |
149 | if (unlikely(__ret_warn_once)) \ | |
150 | if (WARN(!__warned, format)) \ | |
42f247c8 | 151 | __warned = true; \ |
45e9c0de AV |
152 | unlikely(__ret_warn_once); \ |
153 | }) | |
154 | ||
b2be0527 BH |
155 | #define WARN_TAINT_ONCE(condition, taint, format...) ({ \ |
156 | static bool __warned; \ | |
157 | int __ret_warn_once = !!(condition); \ | |
158 | \ | |
159 | if (unlikely(__ret_warn_once)) \ | |
160 | if (WARN_TAINT(!__warned, taint, format)) \ | |
161 | __warned = true; \ | |
162 | unlikely(__ret_warn_once); \ | |
163 | }) | |
164 | ||
717115e1 DY |
165 | #define WARN_ON_RATELIMIT(condition, state) \ |
166 | WARN_ON((condition) && __ratelimit(state)) | |
167 | ||
8eb94f80 IM |
168 | #ifdef CONFIG_SMP |
169 | # define WARN_ON_SMP(x) WARN_ON(x) | |
170 | #else | |
171 | # define WARN_ON_SMP(x) do { } while (0) | |
172 | #endif | |
173 | ||
1da177e4 | 174 | #endif |