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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 | |
09682c1d PM |
6 | #ifdef CONFIG_GENERIC_BUG |
7 | #define BUGFLAG_WARNING (1 << 0) | |
19d43626 PZ |
8 | #define BUGFLAG_ONCE (1 << 1) |
9 | #define BUGFLAG_DONE (1 << 2) | |
f26dee15 | 10 | #define BUGFLAG_TAINT(taint) ((taint) << 8) |
09682c1d PM |
11 | #define BUG_GET_TAINT(bug) ((bug)->flags >> 8) |
12 | #endif | |
13 | ||
14 | #ifndef __ASSEMBLY__ | |
15 | #include <linux/kernel.h> | |
16 | ||
c8538a7a | 17 | #ifdef CONFIG_BUG |
7664c5a1 JF |
18 | |
19 | #ifdef CONFIG_GENERIC_BUG | |
7664c5a1 | 20 | struct bug_entry { |
b93a531e | 21 | #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS |
7664c5a1 | 22 | unsigned long bug_addr; |
b93a531e JB |
23 | #else |
24 | signed int bug_addr_disp; | |
25 | #endif | |
7664c5a1 | 26 | #ifdef CONFIG_DEBUG_BUGVERBOSE |
b93a531e | 27 | #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS |
7664c5a1 | 28 | const char *file; |
b93a531e JB |
29 | #else |
30 | signed int file_disp; | |
31 | #endif | |
7664c5a1 JF |
32 | unsigned short line; |
33 | #endif | |
34 | unsigned short flags; | |
35 | }; | |
7664c5a1 JF |
36 | #endif /* CONFIG_GENERIC_BUG */ |
37 | ||
af9379c7 DB |
38 | /* |
39 | * Don't use BUG() or BUG_ON() unless there's really no way out; one | |
40 | * example might be detecting data structure corruption in the middle | |
41 | * of an operation that can't be backed out of. If the (sub)system | |
42 | * can somehow continue operating, perhaps with reduced functionality, | |
43 | * it's probably not BUG-worthy. | |
44 | * | |
45 | * If you're tempted to BUG(), think again: is completely giving up | |
46 | * really the *only* solution? There are usually better options, where | |
47 | * users don't need to reboot ASAP and can mostly shut down cleanly. | |
48 | */ | |
1da177e4 LT |
49 | #ifndef HAVE_ARCH_BUG |
50 | #define BUG() do { \ | |
d5c003b4 | 51 | printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \ |
1da177e4 LT |
52 | panic("BUG!"); \ |
53 | } while (0) | |
54 | #endif | |
55 | ||
1da177e4 | 56 | #ifndef HAVE_ARCH_BUG_ON |
a3f7607d | 57 | #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0) |
1da177e4 LT |
58 | #endif |
59 | ||
19d43626 PZ |
60 | #ifdef __WARN_FLAGS |
61 | #define __WARN_TAINT(taint) __WARN_FLAGS(BUGFLAG_TAINT(taint)) | |
62 | #define __WARN_ONCE_TAINT(taint) __WARN_FLAGS(BUGFLAG_ONCE|BUGFLAG_TAINT(taint)) | |
63 | ||
64 | #define WARN_ON_ONCE(condition) ({ \ | |
65 | int __ret_warn_on = !!(condition); \ | |
66 | if (unlikely(__ret_warn_on)) \ | |
67 | __WARN_ONCE_TAINT(TAINT_WARN); \ | |
68 | unlikely(__ret_warn_on); \ | |
69 | }) | |
70 | #endif | |
71 | ||
af9379c7 DB |
72 | /* |
73 | * WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report | |
74 | * significant issues that need prompt attention if they should ever | |
75 | * appear at runtime. Use the versions with printk format strings | |
76 | * to provide better diagnostics. | |
77 | */ | |
b2be0527 | 78 | #ifndef __WARN_TAINT |
b9075fa9 JP |
79 | extern __printf(3, 4) |
80 | void warn_slowpath_fmt(const char *file, const int line, | |
81 | const char *fmt, ...); | |
82 | extern __printf(4, 5) | |
83 | void warn_slowpath_fmt_taint(const char *file, const int line, unsigned taint, | |
84 | const char *fmt, ...); | |
57adc4d2 | 85 | extern void warn_slowpath_null(const char *file, const int line); |
79b4cc5e | 86 | #define WANT_WARN_ON_SLOWPATH |
57adc4d2 AK |
87 | #define __WARN() warn_slowpath_null(__FILE__, __LINE__) |
88 | #define __WARN_printf(arg...) warn_slowpath_fmt(__FILE__, __LINE__, arg) | |
b2be0527 BH |
89 | #define __WARN_printf_taint(taint, arg...) \ |
90 | warn_slowpath_fmt_taint(__FILE__, __LINE__, taint, arg) | |
a8f18b90 | 91 | #else |
b2be0527 | 92 | #define __WARN() __WARN_TAINT(TAINT_WARN) |
ec5679e5 | 93 | #define __WARN_printf(arg...) do { printk(arg); __WARN(); } while (0) |
b2be0527 BH |
94 | #define __WARN_printf_taint(taint, arg...) \ |
95 | do { printk(arg); __WARN_TAINT(taint); } while (0) | |
3a6a62f9 OJ |
96 | #endif |
97 | ||
2553b67a JP |
98 | /* used internally by panic.c */ |
99 | struct warn_args; | |
0b396923 | 100 | struct pt_regs; |
2553b67a JP |
101 | |
102 | void __warn(const char *file, int line, void *caller, unsigned taint, | |
103 | struct pt_regs *regs, struct warn_args *args); | |
104 | ||
3a6a62f9 | 105 | #ifndef WARN_ON |
684f9783 | 106 | #define WARN_ON(condition) ({ \ |
8d4fbcfb | 107 | int __ret_warn_on = !!(condition); \ |
3a6a62f9 OJ |
108 | if (unlikely(__ret_warn_on)) \ |
109 | __WARN(); \ | |
684f9783 HX |
110 | unlikely(__ret_warn_on); \ |
111 | }) | |
1da177e4 LT |
112 | #endif |
113 | ||
a8f18b90 | 114 | #ifndef WARN |
19d43626 | 115 | #define WARN(condition, format...) ({ \ |
a8f18b90 AV |
116 | int __ret_warn_on = !!(condition); \ |
117 | if (unlikely(__ret_warn_on)) \ | |
118 | __WARN_printf(format); \ | |
119 | unlikely(__ret_warn_on); \ | |
120 | }) | |
121 | #endif | |
122 | ||
b2be0527 BH |
123 | #define WARN_TAINT(condition, taint, format...) ({ \ |
124 | int __ret_warn_on = !!(condition); \ | |
125 | if (unlikely(__ret_warn_on)) \ | |
126 | __WARN_printf_taint(taint, format); \ | |
127 | unlikely(__ret_warn_on); \ | |
128 | }) | |
129 | ||
19d43626 | 130 | #ifndef WARN_ON_ONCE |
d69a8922 | 131 | #define WARN_ON_ONCE(condition) ({ \ |
7ccaba53 | 132 | static bool __section(.data.unlikely) __warned; \ |
8d4fbcfb | 133 | int __ret_warn_once = !!(condition); \ |
d69a8922 | 134 | \ |
dfbf2897 SR |
135 | if (unlikely(__ret_warn_once && !__warned)) { \ |
136 | __warned = true; \ | |
137 | WARN_ON(1); \ | |
138 | } \ | |
d69a8922 | 139 | unlikely(__ret_warn_once); \ |
74bb6a09 | 140 | }) |
19d43626 | 141 | #endif |
74bb6a09 | 142 | |
45e9c0de | 143 | #define WARN_ONCE(condition, format...) ({ \ |
7ccaba53 | 144 | static bool __section(.data.unlikely) __warned; \ |
45e9c0de AV |
145 | int __ret_warn_once = !!(condition); \ |
146 | \ | |
dfbf2897 SR |
147 | if (unlikely(__ret_warn_once && !__warned)) { \ |
148 | __warned = true; \ | |
149 | WARN(1, format); \ | |
150 | } \ | |
45e9c0de AV |
151 | unlikely(__ret_warn_once); \ |
152 | }) | |
153 | ||
b2be0527 | 154 | #define WARN_TAINT_ONCE(condition, taint, format...) ({ \ |
7ccaba53 | 155 | static bool __section(.data.unlikely) __warned; \ |
b2be0527 BH |
156 | int __ret_warn_once = !!(condition); \ |
157 | \ | |
dfbf2897 SR |
158 | if (unlikely(__ret_warn_once && !__warned)) { \ |
159 | __warned = true; \ | |
160 | WARN_TAINT(1, taint, format); \ | |
161 | } \ | |
b2be0527 BH |
162 | unlikely(__ret_warn_once); \ |
163 | }) | |
164 | ||
b607e70e JT |
165 | #else /* !CONFIG_BUG */ |
166 | #ifndef HAVE_ARCH_BUG | |
a4b5d580 | 167 | #define BUG() do {} while (1) |
b607e70e JT |
168 | #endif |
169 | ||
170 | #ifndef HAVE_ARCH_BUG_ON | |
3c047057 | 171 | #define BUG_ON(condition) do { if (condition) BUG(); } while (0) |
b607e70e JT |
172 | #endif |
173 | ||
174 | #ifndef HAVE_ARCH_WARN_ON | |
175 | #define WARN_ON(condition) ({ \ | |
176 | int __ret_warn_on = !!(condition); \ | |
177 | unlikely(__ret_warn_on); \ | |
178 | }) | |
179 | #endif | |
180 | ||
181 | #ifndef WARN | |
182 | #define WARN(condition, format...) ({ \ | |
183 | int __ret_warn_on = !!(condition); \ | |
4e50ebde | 184 | no_printk(format); \ |
b607e70e JT |
185 | unlikely(__ret_warn_on); \ |
186 | }) | |
187 | #endif | |
188 | ||
189 | #define WARN_ON_ONCE(condition) WARN_ON(condition) | |
190 | #define WARN_ONCE(condition, format...) WARN(condition, format) | |
191 | #define WARN_TAINT(condition, taint, format...) WARN(condition, format) | |
192 | #define WARN_TAINT_ONCE(condition, taint, format...) WARN(condition, format) | |
193 | ||
194 | #endif | |
195 | ||
2092e6be SR |
196 | /* |
197 | * WARN_ON_SMP() is for cases that the warning is either | |
198 | * meaningless for !SMP or may even cause failures. | |
199 | * This is usually used for cases that we have | |
200 | * WARN_ON(!spin_is_locked(&lock)) checks, as spin_is_locked() | |
201 | * returns 0 for uniprocessor settings. | |
202 | * It can also be used with values that are only defined | |
203 | * on SMP: | |
204 | * | |
205 | * struct foo { | |
206 | * [...] | |
207 | * #ifdef CONFIG_SMP | |
208 | * int bar; | |
209 | * #endif | |
210 | * }; | |
211 | * | |
212 | * void func(struct foo *zoot) | |
213 | * { | |
214 | * WARN_ON_SMP(!zoot->bar); | |
215 | * | |
216 | * For CONFIG_SMP, WARN_ON_SMP() should act the same as WARN_ON(), | |
217 | * and should be a nop and return false for uniprocessor. | |
218 | * | |
219 | * if (WARN_ON_SMP(x)) returns true only when CONFIG_SMP is set | |
220 | * and x is true. | |
221 | */ | |
8eb94f80 IM |
222 | #ifdef CONFIG_SMP |
223 | # define WARN_ON_SMP(x) WARN_ON(x) | |
224 | #else | |
ccd0d44f SR |
225 | /* |
226 | * Use of ({0;}) because WARN_ON_SMP(x) may be used either as | |
227 | * a stand alone line statement or as a condition in an if () | |
228 | * statement. | |
229 | * A simple "0" would cause gcc to give a "statement has no effect" | |
230 | * warning. | |
231 | */ | |
2092e6be | 232 | # define WARN_ON_SMP(x) ({0;}) |
8eb94f80 IM |
233 | #endif |
234 | ||
2603efa3 PM |
235 | #endif /* __ASSEMBLY__ */ |
236 | ||
1da177e4 | 237 | #endif |