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Edit File: bug.h

/* 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