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 18struct 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 65extern __printf(3, 4) 66void warn_slowpath_fmt(const char *file, const int line, 67 const char *fmt, ...); 68extern __printf(4, 5) 69void warn_slowpath_fmt_taint(const char *file, const int line, unsigned taint, 70 const char *fmt, ...); 71extern 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#define WARN_ON_ONCE(condition) ({ \ 110 static bool __section(.data.unlikely) __warned; \ 111 int __ret_warn_once = !!(condition); \ 112 \ 113 if (unlikely(__ret_warn_once)) \ 114 if (WARN_ON(!__warned)) \ 115 __warned = true; \ 116 unlikely(__ret_warn_once); \ 117}) 118 119#define WARN_ONCE(condition, format...) ({ \ 120 static bool __section(.data.unlikely) __warned; \ 121 int __ret_warn_once = !!(condition); \ 122 \ 123 if (unlikely(__ret_warn_once)) \ 124 if (WARN(!__warned, format)) \ 125 __warned = true; \ 126 unlikely(__ret_warn_once); \ 127}) 128 129#define WARN_TAINT_ONCE(condition, taint, format...) ({ \ 130 static bool __section(.data.unlikely) __warned; \ 131 int __ret_warn_once = !!(condition); \ 132 \ 133 if (unlikely(__ret_warn_once)) \ 134 if (WARN_TAINT(!__warned, taint, format)) \ 135 __warned = true; \ 136 unlikely(__ret_warn_once); \ 137}) 138 139#else /* !CONFIG_BUG */ 140#ifndef HAVE_ARCH_BUG 141#define BUG() do {} while (1) 142#endif 143 144#ifndef HAVE_ARCH_BUG_ON 145#define BUG_ON(condition) do { if (condition) ; } while (0) 146#endif 147 148#ifndef HAVE_ARCH_WARN_ON 149#define WARN_ON(condition) ({ \ 150 int __ret_warn_on = !!(condition); \ 151 unlikely(__ret_warn_on); \ 152}) 153#endif 154 155#ifndef WARN 156#define WARN(condition, format...) ({ \ 157 int __ret_warn_on = !!(condition); \ 158 no_printk(format); \ 159 unlikely(__ret_warn_on); \ 160}) 161#endif 162 163#define WARN_ON_ONCE(condition) WARN_ON(condition) 164#define WARN_ONCE(condition, format...) WARN(condition, format) 165#define WARN_TAINT(condition, taint, format...) WARN(condition, format) 166#define WARN_TAINT_ONCE(condition, taint, format...) WARN(condition, format) 167 168#endif 169 170/* 171 * WARN_ON_SMP() is for cases that the warning is either 172 * meaningless for !SMP or may even cause failures. 173 * This is usually used for cases that we have 174 * WARN_ON(!spin_is_locked(&lock)) checks, as spin_is_locked() 175 * returns 0 for uniprocessor settings. 176 * It can also be used with values that are only defined 177 * on SMP: 178 * 179 * struct foo { 180 * [...] 181 * #ifdef CONFIG_SMP 182 * int bar; 183 * #endif 184 * }; 185 * 186 * void func(struct foo *zoot) 187 * { 188 * WARN_ON_SMP(!zoot->bar); 189 * 190 * For CONFIG_SMP, WARN_ON_SMP() should act the same as WARN_ON(), 191 * and should be a nop and return false for uniprocessor. 192 * 193 * if (WARN_ON_SMP(x)) returns true only when CONFIG_SMP is set 194 * and x is true. 195 */ 196#ifdef CONFIG_SMP 197# define WARN_ON_SMP(x) WARN_ON(x) 198#else 199/* 200 * Use of ({0;}) because WARN_ON_SMP(x) may be used either as 201 * a stand alone line statement or as a condition in an if () 202 * statement. 203 * A simple "0" would cause gcc to give a "statement has no effect" 204 * warning. 205 */ 206# define WARN_ON_SMP(x) ({0;}) 207#endif 208 209#endif /* __ASSEMBLY__ */ 210 211#endif 212