text: /* SPDX-License-Identifier: GPL-2.0 */
  #ifndef _ASM_GENERIC_BUG_H
  #define _ASM_GENERIC_BUG_H
  
  #include <linux/compiler.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_TAINT(taint)	((taint) << 8)
  #define BUG_GET_TAINT(bug)	((bug)->flags >> 8)
  #endif
  
  #ifndef __ASSEMBLY__
  #include <linux/kernel.h>
  
  struct bug_entry {
  #ifdef CONFIG_GENERIC_BUG
  #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 */
  };
  
  #ifdef CONFIG_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
  
  #ifdef __WARN_FLAGS
  #define __WARN_TAINT(taint)		__WARN_FLAGS(BUGFLAG_TAINT(taint))
  #define __WARN_ONCE_TAINT(taint)	__WARN_FLAGS(BUGFLAG_ONCE|BUGFLAG_TAINT(taint))
  
  #define WARN_ON_ONCE(condition) ({				\
  	int __ret_warn_on = !!(condition);			\
  	if (unlikely(__ret_warn_on))				\
  		__WARN_ONCE_TAINT(TAINT_WARN);			\
  	unlikely(__ret_warn_on);				\
  })
  #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_TAINT
  extern __printf(3, 4)
  void warn_slowpath_fmt(const char *file, const int line,
  		       const char *fmt, ...);
  extern __printf(4, 5)
  void warn_slowpath_fmt_taint(const char *file, const int line, unsigned taint,
  			     const char *fmt, ...);
  extern void warn_slowpath_null(const char *file, const int line);
  #define WANT_WARN_ON_SLOWPATH
  #define __WARN()		warn_slowpath_null(__FILE__, __LINE__)
  #define __WARN_printf(arg...)	warn_slowpath_fmt(__FILE__, __LINE__, arg)
  #define __WARN_printf_taint(taint, arg...)				\
  	warn_slowpath_fmt_taint(__FILE__, __LINE__, taint, arg)
  #else
  extern __printf(1, 2) void __warn_printk(const char *fmt, ...);
  #define __WARN()		__WARN_TAINT(TAINT_WARN)
  #define __WARN_printf(arg...)	do { __warn_printk(arg); __WARN(); } while (0)
  #define __WARN_printf_taint(taint, arg...)				\
  	do { __warn_printk(arg); __WARN_TAINT(taint); } while (0)
  #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(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(taint, format);			\
  	unlikely(__ret_warn_on);					\
  })
  
  #ifndef WARN_ON_ONCE
  #define WARN_ON_ONCE(condition)	({				\
  	static bool __section(.data.once) __warned;		\
  	int __ret_warn_once = !!(condition);			\
  								\
  	if (unlikely(__ret_warn_once && !__warned)) {		\
  		__warned = true;				\
  		WARN_ON(1);					\
  	}							\
  	unlikely(__ret_warn_once);				\
  })
  #endif
  
  #define WARN_ONCE(condition, format...)	({			\
  	static bool __section(.data.once) __warned;		\
  	int __ret_warn_once = !!(condition);			\
  								\
  	if (unlikely(__ret_warn_once && !__warned)) {		\
  		__warned = true;				\
  		WARN(1, format);				\
  	}							\
  	unlikely(__ret_warn_once);				\
  })
  
  #define WARN_TAINT_ONCE(condition, taint, format...)	({	\
  	static bool __section(.data.once) __warned;		\
  	int __ret_warn_once = !!(condition);			\
  								\
  	if (unlikely(__ret_warn_once && !__warned)) {		\
  		__warned = true;				\
  		WARN_TAINT(1, taint, format);			\
  	}							\
  	unlikely(__ret_warn_once);				\
  })
  
  #else /* !CONFIG_BUG */
  #ifndef HAVE_ARCH_BUG
  #define BUG() do {} while (1)
  #endif
  
  #ifndef HAVE_ARCH_BUG_ON
  #define BUG_ON(condition) do { if (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.
   * This is usually used for cases that we have
   * WARN_ON(!spin_is_locked(&lock)) checks, as spin_is_locked()
   * returns 0 for uniprocessor settings.
   * 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
  