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