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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 | /* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_GENERIC_BUG_H #define _ASM_GENERIC_BUG_H #include <linux/compiler.h> #include <linux/instrumentation.h> #include <linux/once_lite.h> #define CUT_HERE "------------[ cut here ]------------\n" #ifdef CONFIG_GENERIC_BUG #define BUGFLAG_WARNING (1 << 0) #define BUGFLAG_ONCE (1 << 1) #define BUGFLAG_DONE (1 << 2) #define BUGFLAG_NO_CUT_HERE (1 << 3) /* CUT_HERE already sent */ #define BUGFLAG_TAINT(taint) ((taint) << 8) #define BUG_GET_TAINT(bug) ((bug)->flags >> 8) #endif #ifndef __ASSEMBLY__ #include <linux/panic.h> #include <linux/printk.h> #ifdef CONFIG_BUG #ifdef CONFIG_GENERIC_BUG struct bug_entry { #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS unsigned long bug_addr; #else signed int bug_addr_disp; #endif #ifdef CONFIG_DEBUG_BUGVERBOSE #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS const char *file; #else signed int file_disp; #endif unsigned short line; #endif unsigned short flags; }; #endif /* CONFIG_GENERIC_BUG */ /* * Don't use BUG() or BUG_ON() unless there's really no way out; one * example might be detecting data structure corruption in the middle * of an operation that can't be backed out of. If the (sub)system * can somehow continue operating, perhaps with reduced functionality, * it's probably not BUG-worthy. * * If you're tempted to BUG(), think again: is completely giving up * really the *only* solution? There are usually better options, where * users don't need to reboot ASAP and can mostly shut down cleanly. */ #ifndef HAVE_ARCH_BUG #define BUG() do { \ printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \ barrier_before_unreachable(); \ panic("BUG!"); \ } while (0) #endif #ifndef HAVE_ARCH_BUG_ON #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0) #endif /* * WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report * significant kernel issues that need prompt attention if they should ever * appear at runtime. * * Do not use these macros when checking for invalid external inputs * (e.g. invalid system call arguments, or invalid data coming from * network/devices), and on transient conditions like ENOMEM or EAGAIN. * These macros should be used for recoverable kernel issues only. * For invalid external inputs, transient conditions, etc use * pr_err[_once/_ratelimited]() followed by dump_stack(), if necessary. * Do not include "BUG"/"WARNING" in format strings manually to make these * conditions distinguishable from kernel issues. * * Use the versions with printk format strings to provide better diagnostics. */ #ifndef __WARN_FLAGS extern __printf(4, 5) void warn_slowpath_fmt(const char *file, const int line, unsigned taint, const char *fmt, ...); #define __WARN() __WARN_printf(TAINT_WARN, NULL) #define __WARN_printf(taint, arg...) do { \ instrumentation_begin(); \ warn_slowpath_fmt(__FILE__, __LINE__, taint, arg); \ instrumentation_end(); \ } while (0) #else extern __printf(1, 2) void __warn_printk(const char *fmt, ...); #define __WARN() __WARN_FLAGS(BUGFLAG_TAINT(TAINT_WARN)) #define __WARN_printf(taint, arg...) do { \ instrumentation_begin(); \ __warn_printk(arg); \ __WARN_FLAGS(BUGFLAG_NO_CUT_HERE | BUGFLAG_TAINT(taint));\ instrumentation_end(); \ } while (0) #define WARN_ON_ONCE(condition) ({ \ int __ret_warn_on = !!(condition); \ if (unlikely(__ret_warn_on)) \ __WARN_FLAGS(BUGFLAG_ONCE | \ BUGFLAG_TAINT(TAINT_WARN)); \ unlikely(__ret_warn_on); \ }) #endif /* used internally by panic.c */ struct warn_args; struct pt_regs; void __warn(const char *file, int line, void *caller, unsigned taint, struct pt_regs *regs, struct warn_args *args); #ifndef WARN_ON #define WARN_ON(condition) ({ \ int __ret_warn_on = !!(condition); \ if (unlikely(__ret_warn_on)) \ __WARN(); \ unlikely(__ret_warn_on); \ }) #endif #ifndef WARN #define WARN(condition, format...) ({ \ int __ret_warn_on = !!(condition); \ if (unlikely(__ret_warn_on)) \ __WARN_printf(TAINT_WARN, format); \ unlikely(__ret_warn_on); \ }) #endif #define WARN_TAINT(condition, taint, format...) ({ \ int __ret_warn_on = !!(condition); \ if (unlikely(__ret_warn_on)) \ __WARN_printf(taint, format); \ unlikely(__ret_warn_on); \ }) #ifndef WARN_ON_ONCE #define WARN_ON_ONCE(condition) \ DO_ONCE_LITE_IF(condition, WARN_ON, 1) #endif #define WARN_ONCE(condition, format...) \ DO_ONCE_LITE_IF(condition, WARN, 1, format) #define WARN_TAINT_ONCE(condition, taint, format...) \ DO_ONCE_LITE_IF(condition, WARN_TAINT, 1, taint, format) #else /* !CONFIG_BUG */ #ifndef HAVE_ARCH_BUG #define BUG() do {} while (1) #endif #ifndef HAVE_ARCH_BUG_ON #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0) #endif #ifndef HAVE_ARCH_WARN_ON #define WARN_ON(condition) ({ \ int __ret_warn_on = !!(condition); \ unlikely(__ret_warn_on); \ }) #endif #ifndef WARN #define WARN(condition, format...) ({ \ int __ret_warn_on = !!(condition); \ no_printk(format); \ unlikely(__ret_warn_on); \ }) #endif #define WARN_ON_ONCE(condition) WARN_ON(condition) #define WARN_ONCE(condition, format...) WARN(condition, format) #define WARN_TAINT(condition, taint, format...) WARN(condition, format) #define WARN_TAINT_ONCE(condition, taint, format...) WARN(condition, format) #endif /* * WARN_ON_SMP() is for cases that the warning is either * meaningless for !SMP or may even cause failures. * It can also be used with values that are only defined * on SMP: * * struct foo { * [...] * #ifdef CONFIG_SMP * int bar; * #endif * }; * * void func(struct foo *zoot) * { * WARN_ON_SMP(!zoot->bar); * * For CONFIG_SMP, WARN_ON_SMP() should act the same as WARN_ON(), * and should be a nop and return false for uniprocessor. * * if (WARN_ON_SMP(x)) returns true only when CONFIG_SMP is set * and x is true. */ #ifdef CONFIG_SMP # define WARN_ON_SMP(x) WARN_ON(x) #else /* * Use of ({0;}) because WARN_ON_SMP(x) may be used either as * a stand alone line statement or as a condition in an if () * statement. * A simple "0" would cause gcc to give a "statement has no effect" * warning. */ # define WARN_ON_SMP(x) ({0;}) #endif /* * WARN_ON_FUNCTION_MISMATCH() warns if a value doesn't match a * function address, and can be useful for catching issues with * callback functions, for example. * * With CONFIG_CFI_CLANG, the warning is disabled because the * compiler replaces function addresses taken in C code with * local jump table addresses, which breaks cross-module function * address equality. */ #if defined(CONFIG_CFI_CLANG) && defined(CONFIG_MODULES) # define WARN_ON_FUNCTION_MISMATCH(x, fn) ({ 0; }) #else # define WARN_ON_FUNCTION_MISMATCH(x, fn) WARN_ON_ONCE((x) != (fn)) #endif #endif /* __ASSEMBLY__ */ #endif |