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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264/* 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_ARGS (1 << 4)#define BUGFLAG_TAINT(taint) ((taint) << 8)#define BUG_GET_TAINT(bug) ((bug)->flags >> 8)#endif
#ifndef WARN_CONDITION_STR#ifdef CONFIG_DEBUG_BUGVERBOSE_DETAILED# define WARN_CONDITION_STR(cond_str) "[" cond_str "] "#else# define WARN_CONDITION_STR(cond_str)#endif#endif /* WARN_CONDITION_STR */
#ifndef __ASSEMBLY__#include <linux/panic.h>#include <linux/printk.h>
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);
#ifdef CONFIG_BUG
#ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS#define BUG_REL(type, name) type name#else#define BUG_REL(type, name) signed int name##_disp#endif
#ifdef CONFIG_GENERIC_BUGstruct bug_entry { BUG_REL(unsigned long, bug_addr);#ifdef HAVE_ARCH_BUG_FORMAT BUG_REL(const char *, format);#endif#ifdef CONFIG_DEBUG_BUGVERBOSE BUG_REL(const char *, file); 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. */extern __printf(4, 5)void warn_slowpath_fmt(const char *file, const int line, unsigned taint, const char *fmt, ...);extern __printf(1, 2) void __warn_printk(const char *fmt, ...);
#ifdef __WARN_FLAGS#define __WARN() __WARN_FLAGS("", BUGFLAG_TAINT(TAINT_WARN))
#ifndef WARN_ON#define WARN_ON(condition) ({ \ int __ret_warn_on = !!(condition); \ if (unlikely(__ret_warn_on)) \ __WARN_FLAGS(#condition, \ BUGFLAG_TAINT(TAINT_WARN)); \ unlikely(__ret_warn_on); \})#endif
#ifndef WARN_ON_ONCE#define WARN_ON_ONCE(condition) ({ \ int __ret_warn_on = !!(condition); \ if (unlikely(__ret_warn_on)) \ __WARN_FLAGS(#condition, \ BUGFLAG_ONCE | \ BUGFLAG_TAINT(TAINT_WARN)); \ unlikely(__ret_warn_on); \})#endif#endif /* __WARN_FLAGS */
#if defined(__WARN_FLAGS) && !defined(__WARN_printf)#define __WARN_printf(taint, arg...) do { \ instrumentation_begin(); \ __warn_printk(arg); \ __WARN_FLAGS("", BUGFLAG_NO_CUT_HERE | BUGFLAG_TAINT(taint));\ instrumentation_end(); \ } while (0)#endif
#ifndef __WARN_printf#define __WARN_printf(taint, arg...) do { \ instrumentation_begin(); \ warn_slowpath_fmt(__FILE__, __LINE__, taint, arg); \ instrumentation_end(); \ } while (0)#endif
#ifndef __WARN#define __WARN() __WARN_printf(TAINT_WARN, NULL)#endif
/* used internally by panic.c */
#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
#ifndef WARN_ONCE#define WARN_ONCE(condition, format...) \ DO_ONCE_LITE_IF(condition, WARN, 1, format)#endif
#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 { \ do {} while (1); \ unreachable(); \} while (0)#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
#endif /* __ASSEMBLY__ */
#endif