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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6936 | serge | 1 | #ifndef _ASM_GENERIC_BUG_H |
| 2 | #define _ASM_GENERIC_BUG_H |
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| 3 | |||
| 4 | #include |
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| 5 | |||
| 6 | #ifdef CONFIG_GENERIC_BUG |
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| 7 | #define BUGFLAG_WARNING (1 << 0) |
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| 8 | #define BUGFLAG_TAINT(taint) (BUGFLAG_WARNING | ((taint) << 8)) |
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| 9 | #define BUG_GET_TAINT(bug) ((bug)->flags >> 8) |
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| 10 | #endif |
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| 11 | |||
| 12 | #ifndef __ASSEMBLY__ |
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| 13 | #include |
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| 14 | |||
| 15 | #ifdef CONFIG_BUG |
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| 16 | |||
| 17 | #ifdef CONFIG_GENERIC_BUG |
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| 18 | struct bug_entry { |
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| 19 | #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS |
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| 20 | unsigned long bug_addr; |
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| 21 | #else |
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| 22 | signed int bug_addr_disp; |
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| 23 | #endif |
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| 24 | #ifdef CONFIG_DEBUG_BUGVERBOSE |
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| 25 | #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS |
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| 26 | const char *file; |
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| 27 | #else |
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| 28 | signed int file_disp; |
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| 29 | #endif |
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| 30 | unsigned short line; |
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| 31 | #endif |
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| 32 | unsigned short flags; |
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| 33 | }; |
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| 34 | #endif /* CONFIG_GENERIC_BUG */ |
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| 35 | |||
| 36 | /* |
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| 37 | * Don't use BUG() or BUG_ON() unless there's really no way out; one |
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| 38 | * example might be detecting data structure corruption in the middle |
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| 39 | * of an operation that can't be backed out of. If the (sub)system |
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| 40 | * can somehow continue operating, perhaps with reduced functionality, |
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| 41 | * it's probably not BUG-worthy. |
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| 42 | * |
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| 43 | * If you're tempted to BUG(), think again: is completely giving up |
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| 44 | * really the *only* solution? There are usually better options, where |
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| 45 | * users don't need to reboot ASAP and can mostly shut down cleanly. |
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| 46 | */ |
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| 47 | #ifndef HAVE_ARCH_BUG |
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| 48 | #define BUG() do { \ |
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| 49 | printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \ |
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| 50 | panic("BUG!"); \ |
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| 51 | } while (0) |
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| 52 | #endif |
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| 53 | |||
| 54 | #ifndef HAVE_ARCH_BUG_ON |
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| 55 | #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0) |
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| 56 | #endif |
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| 57 | |||
| 58 | /* |
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| 59 | * WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report |
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| 60 | * significant issues that need prompt attention if they should ever |
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| 61 | * appear at runtime. Use the versions with printk format strings |
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| 62 | * to provide better diagnostics. |
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| 63 | */ |
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| 64 | #ifndef __WARN_TAINT |
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| 65 | extern __printf(3, 4) |
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| 66 | void warn_slowpath_fmt(const char *file, const int line, |
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| 67 | const char *fmt, ...); |
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| 68 | extern __printf(4, 5) |
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| 69 | void warn_slowpath_fmt_taint(const char *file, const int line, unsigned taint, |
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| 70 | const char *fmt, ...); |
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| 71 | extern void warn_slowpath_null(const char *file, const int line); |
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| 72 | #define WANT_WARN_ON_SLOWPATH |
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| 73 | #define __WARN() warn_slowpath_null(__FILE__, __LINE__) |
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| 74 | #define __WARN_printf(arg...) warn_slowpath_fmt(__FILE__, __LINE__, arg) |
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| 75 | #define __WARN_printf_taint(taint, arg...) \ |
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| 76 | warn_slowpath_fmt_taint(__FILE__, __LINE__, taint, arg) |
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| 77 | #else |
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| 78 | #define __WARN() __WARN_TAINT(TAINT_WARN) |
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| 79 | #define __WARN_printf(arg...) do { printk(arg); __WARN(); } while (0) |
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| 80 | #define __WARN_printf_taint(taint, arg...) \ |
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| 81 | do { printk(arg); __WARN_TAINT(taint); } while (0) |
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| 82 | #endif |
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| 83 | |||
| 84 | #ifndef WARN_ON |
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| 85 | #define WARN_ON(condition) ({ \ |
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| 86 | int __ret_warn_on = !!(condition); \ |
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| 87 | if (unlikely(__ret_warn_on)) \ |
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| 88 | __WARN(); \ |
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| 89 | unlikely(__ret_warn_on); \ |
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| 90 | }) |
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| 91 | #endif |
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| 92 | |||
| 93 | #ifndef WARN |
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| 94 | #define WARN(condition, format...) ({ \ |
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| 95 | int __ret_warn_on = !!(condition); \ |
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| 96 | if (unlikely(__ret_warn_on)) \ |
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| 97 | __WARN_printf(format); \ |
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| 98 | unlikely(__ret_warn_on); \ |
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| 99 | }) |
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| 100 | #endif |
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| 101 | |||
| 102 | #define WARN_TAINT(condition, taint, format...) ({ \ |
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| 103 | int __ret_warn_on = !!(condition); \ |
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| 104 | if (unlikely(__ret_warn_on)) \ |
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| 105 | __WARN_printf_taint(taint, format); \ |
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| 106 | unlikely(__ret_warn_on); \ |
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| 107 | }) |
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| 108 | |||
| 109 | #define WARN_ON_ONCE(condition) ({ \ |
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| 110 | static bool __section(.data.unlikely) __warned; \ |
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| 111 | int __ret_warn_once = !!(condition); \ |
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| 112 | \ |
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| 113 | if (unlikely(__ret_warn_once)) \ |
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| 114 | if (WARN_ON(!__warned)) \ |
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| 115 | __warned = true; \ |
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| 116 | unlikely(__ret_warn_once); \ |
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| 117 | }) |
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| 118 | |||
| 119 | #define WARN_ONCE(condition, format...) ({ \ |
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| 120 | static bool __section(.data.unlikely) __warned; \ |
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| 121 | int __ret_warn_once = !!(condition); \ |
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| 122 | \ |
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| 123 | if (unlikely(__ret_warn_once)) \ |
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| 124 | if (WARN(!__warned, format)) \ |
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| 125 | __warned = true; \ |
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| 126 | unlikely(__ret_warn_once); \ |
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| 127 | }) |
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| 128 | |||
| 129 | #define WARN_TAINT_ONCE(condition, taint, format...) ({ \ |
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| 130 | static bool __section(.data.unlikely) __warned; \ |
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| 131 | int __ret_warn_once = !!(condition); \ |
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| 132 | \ |
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| 133 | if (unlikely(__ret_warn_once)) \ |
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| 134 | if (WARN_TAINT(!__warned, taint, format)) \ |
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| 135 | __warned = true; \ |
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| 136 | unlikely(__ret_warn_once); \ |
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| 137 | }) |
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| 138 | |||
| 139 | #else /* !CONFIG_BUG */ |
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| 140 | #ifndef HAVE_ARCH_BUG |
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| 141 | #define BUG() do {} while (1) |
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| 142 | #endif |
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| 143 | |||
| 144 | #ifndef HAVE_ARCH_BUG_ON |
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| 145 | #define BUG_ON(condition) do { if (condition) ; } while (0) |
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| 146 | #endif |
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| 147 | |||
| 148 | #ifndef HAVE_ARCH_WARN_ON |
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| 149 | #define WARN_ON(condition) ({ \ |
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| 150 | int __ret_warn_on = !!(condition); \ |
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| 151 | unlikely(__ret_warn_on); \ |
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| 152 | }) |
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| 153 | #endif |
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| 154 | |||
| 155 | #ifndef WARN |
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| 156 | #define WARN(condition, format...) ({ \ |
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| 157 | int __ret_warn_on = !!(condition); \ |
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| 158 | no_printk(format); \ |
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| 159 | unlikely(__ret_warn_on); \ |
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| 160 | }) |
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| 161 | #endif |
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| 162 | |||
| 163 | #define WARN_ON_ONCE(condition) WARN_ON(condition) |
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| 164 | #define WARN_ONCE(condition, format...) WARN(condition, format) |
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| 165 | #define WARN_TAINT(condition, taint, format...) WARN(condition, format) |
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| 166 | #define WARN_TAINT_ONCE(condition, taint, format...) WARN(condition, format) |
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| 167 | |||
| 168 | #endif |
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| 169 | |||
| 170 | /* |
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| 171 | * WARN_ON_SMP() is for cases that the warning is either |
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| 172 | * meaningless for !SMP or may even cause failures. |
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| 173 | * This is usually used for cases that we have |
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| 174 | * WARN_ON(!spin_is_locked(&lock)) checks, as spin_is_locked() |
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| 175 | * returns 0 for uniprocessor settings. |
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| 176 | * It can also be used with values that are only defined |
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| 177 | * on SMP: |
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| 178 | * |
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| 179 | * struct foo { |
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| 180 | * [...] |
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| 181 | * #ifdef CONFIG_SMP |
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| 182 | * int bar; |
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| 183 | * #endif |
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| 184 | * }; |
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| 185 | * |
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| 186 | * void func(struct foo *zoot) |
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| 187 | * { |
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| 188 | * WARN_ON_SMP(!zoot->bar); |
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| 189 | * |
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| 190 | * For CONFIG_SMP, WARN_ON_SMP() should act the same as WARN_ON(), |
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| 191 | * and should be a nop and return false for uniprocessor. |
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| 192 | * |
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| 193 | * if (WARN_ON_SMP(x)) returns true only when CONFIG_SMP is set |
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| 194 | * and x is true. |
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| 195 | */ |
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| 196 | #ifdef CONFIG_SMP |
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| 197 | # define WARN_ON_SMP(x) WARN_ON(x) |
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| 198 | #else |
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| 199 | /* |
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| 200 | * Use of ({0;}) because WARN_ON_SMP(x) may be used either as |
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| 201 | * a stand alone line statement or as a condition in an if () |
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| 202 | * statement. |
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| 203 | * A simple "0" would cause gcc to give a "statement has no effect" |
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| 204 | * warning. |
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| 205 | */ |
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| 206 | # define WARN_ON_SMP(x) ({0;}) |
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| 207 | #endif |
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| 208 | |||
| 209 | #endif /* __ASSEMBLY__ */ |
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| 210 | |||
| 211 | #endif |