| 1 | #ifndef _ASM_GENERIC_BUG_H
|
| 2 | #define _ASM_GENERIC_BUG_H
|
| 3 |
|
| 4 | #include <linux/compiler.h>
|
| 5 |
|
| 6 | #ifdef CONFIG_GENERIC_BUG
|
| 7 | #define BUGFLAG_WARNING (1 << 0)
|
| 8 | #define BUGFLAG_ONCE (1 << 1)
|
| 9 | #define BUGFLAG_DONE (1 << 2)
|
| 10 | #define BUGFLAG_TAINT(taint) ((taint) << 8)
|
| 11 | #define BUG_GET_TAINT(bug) ((bug)->flags >> 8)
|
| 12 | #endif
|
| 13 |
|
| 14 | #ifndef __ASSEMBLY__
|
| 15 | #include <linux/kernel.h>
|
| 16 |
|
| 17 | #ifdef CONFIG_BUG
|
| 18 |
|
| 19 | #ifdef CONFIG_GENERIC_BUG
|
| 20 | struct bug_entry {
|
| 21 | #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
|
| 22 | unsigned long bug_addr;
|
| 23 | #else
|
| 24 | signed int bug_addr_disp;
|
| 25 | #endif
|
| 26 | #ifdef CONFIG_DEBUG_BUGVERBOSE
|
| 27 | #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
|
| 28 | const char *file;
|
| 29 | #else
|
| 30 | signed int file_disp;
|
| 31 | #endif
|
| 32 | unsigned short line;
|
| 33 | #endif
|
| 34 | unsigned short flags;
|
| 35 | };
|
| 36 | #endif
|
| 37 |
|
| 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 |
|
| 49 | #ifndef HAVE_ARCH_BUG
|
| 50 | #define BUG() do { \
|
| 51 | printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
|
| 52 | panic("BUG!"); \
|
| 53 | } while (0)
|
| 54 | #endif
|
| 55 |
|
| 56 | #ifndef HAVE_ARCH_BUG_ON
|
| 57 | #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0)
|
| 58 | #endif
|
| 59 |
|
| 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 |
|
| 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 |
|
| 78 | #ifndef __WARN_TAINT
|
| 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, ...);
|
| 85 | extern void warn_slowpath_null(const char *file, const int line);
|
| 86 | #define WANT_WARN_ON_SLOWPATH
|
| 87 | #define __WARN() warn_slowpath_null(__FILE__, __LINE__)
|
| 88 | #define __WARN_printf(arg...) warn_slowpath_fmt(__FILE__, __LINE__, arg)
|
| 89 | #define __WARN_printf_taint(taint, arg...) \
|
| 90 | warn_slowpath_fmt_taint(__FILE__, __LINE__, taint, arg)
|
| 91 | #else
|
| 92 | #define __WARN() __WARN_TAINT(TAINT_WARN)
|
| 93 | #define __WARN_printf(arg...) do { printk(arg); __WARN(); } while (0)
|
| 94 | #define __WARN_printf_taint(taint, arg...) \
|
| 95 | do { printk(arg); __WARN_TAINT(taint); } while (0)
|
| 96 | #endif
|
| 97 |
|
| 98 |
|
| 99 | struct warn_args;
|
| 100 | struct pt_regs;
|
| 101 |
|
| 102 | void __warn(const char *file, int line, void *caller, unsigned taint,
|
| 103 | struct pt_regs *regs, struct warn_args *args);
|
| 104 |
|
| 105 | #ifndef WARN_ON
|
| 106 | #define WARN_ON(condition) ({ \
|
| 107 | int __ret_warn_on = !!(condition); \
|
| 108 | if (unlikely(__ret_warn_on)) \
|
| 109 | __WARN(); \
|
| 110 | unlikely(__ret_warn_on); \
|
| 111 | })
|
| 112 | #endif
|
| 113 |
|
| 114 | #ifndef WARN
|
| 115 | #define WARN(condition, format...) ({ \
|
| 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 |
|
| 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 |
|
| 130 | #ifndef WARN_ON_ONCE
|
| 131 | #define WARN_ON_ONCE(condition) ({ \
|
| 132 | static bool __section(.data.unlikely) __warned; \
|
| 133 | int __ret_warn_once = !!(condition); \
|
| 134 | \
|
| 135 | if (unlikely(__ret_warn_once && !__warned)) { \
|
| 136 | __warned = true; \
|
| 137 | WARN_ON(1); \
|
| 138 | } \
|
| 139 | unlikely(__ret_warn_once); \
|
| 140 | })
|
| 141 | #endif
|
| 142 |
|
| 143 | #define WARN_ONCE(condition, format...) ({ \
|
| 144 | static bool __section(.data.unlikely) __warned; \
|
| 145 | int __ret_warn_once = !!(condition); \
|
| 146 | \
|
| 147 | if (unlikely(__ret_warn_once && !__warned)) { \
|
| 148 | __warned = true; \
|
| 149 | WARN(1, format); \
|
| 150 | } \
|
| 151 | unlikely(__ret_warn_once); \
|
| 152 | })
|
| 153 |
|
| 154 | #define WARN_TAINT_ONCE(condition, taint, format...) ({ \
|
| 155 | static bool __section(.data.unlikely) __warned; \
|
| 156 | int __ret_warn_once = !!(condition); \
|
| 157 | \
|
| 158 | if (unlikely(__ret_warn_once && !__warned)) { \
|
| 159 | __warned = true; \
|
| 160 | WARN_TAINT(1, taint, format); \
|
| 161 | } \
|
| 162 | unlikely(__ret_warn_once); \
|
| 163 | })
|
| 164 |
|
| 165 | #else
|
| 166 | #ifndef HAVE_ARCH_BUG
|
| 167 | #define BUG() do {} while (1)
|
| 168 | #endif
|
| 169 |
|
| 170 | #ifndef HAVE_ARCH_BUG_ON
|
| 171 | #define BUG_ON(condition) do { if (condition) BUG(); } while (0)
|
| 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); \
|
| 184 | no_printk(format); \
|
| 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 |
|
| 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 |
|
| 222 | #ifdef CONFIG_SMP
|
| 223 | # define WARN_ON_SMP(x) WARN_ON(x)
|
| 224 | #else
|
| 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 |
|
| 232 | # define WARN_ON_SMP(x) ({0;})
|
| 233 | #endif
|
| 234 |
|
| 235 | #endif
|
| 236 |
|
| 237 | #endif
|