linux/include/asm-generic/bug.h

#ifndef _ASM_GENERIC_BUG_H
#define _ASM_GENERIC_BUG_H

#include <linux/compiler.h>

#ifdef CONFIG_BUG

#ifdef CONFIG_GENERIC_BUG
#ifndef __ASSEMBLY__
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		/* __ASSEMBLY__ */

#define BUGFLAG_WARNING		(1 << 0)
#define BUGFLAG_TAINT(taint)	(BUGFLAG_WARNING | ((taint) << 8))
#define BUG_GET_TAINT(bug)	((bug)->flags >> 8)

#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__); \
	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 issues that need prompt attention if they should ever
 * appear at runtime.  Use the versions with printk format strings
 * to provide better diagnostics.
 */
#ifndef __WARN_TAINT
#ifndef __ASSEMBLY__
extern void warn_slowpath_fmt(const char *file, const int line,
		const char *fmt, ...) __attribute__((format(printf, 3, 4)));
extern void warn_slowpath_fmt_taint(const char *file, const int line,
				    unsigned taint, const char *fmt, ...)
	__attribute__((format(printf, 4, 5)));
extern void warn_slowpath_null(const char *file, const int line);
#define WANT_WARN_ON_SLOWPATH
#endif
#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
#define __WARN()		__WARN_TAINT(TAINT_WARN)
#define __WARN_printf(arg...)	do { printk(arg); __WARN(); } while (0)
#define __WARN_printf_taint(taint, arg...)				\
	do { printk(arg); __WARN_TAINT(taint); } while (0)
#endif

#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);					\
})

#else /* !CONFIG_BUG */
#ifndef HAVE_ARCH_BUG
#define BUG() do {} while(0)
#endif

#ifndef HAVE_ARCH_BUG_ON
#define BUG_ON(condition) do { if (condition) ; } 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);				\
	unlikely(__ret_warn_on);					\
})
#endif

#define WARN_TAINT(condition, taint, format...) WARN_ON(condition)

#endif

#define WARN_ON_ONCE(condition)	({				\
	static bool __warned;					\
	int __ret_warn_once = !!(condition);			\
								\
	if (unlikely(__ret_warn_once))				\
		if (WARN_ON(!__warned)) 			\
			__warned = true;			\
	unlikely(__ret_warn_once);				\
})

#define WARN_ONCE(condition, format...)	({			\
	static bool __warned;					\
	int __ret_warn_once = !!(condition);			\
								\
	if (unlikely(__ret_warn_once))				\
		if (WARN(!__warned, format)) 			\
			__warned = true;			\
	unlikely(__ret_warn_once);				\
})

#define WARN_TAINT_ONCE(condition, taint, format...)	({	\
	static bool __warned;					\
	int __ret_warn_once = !!(condition);			\
								\
	if (unlikely(__ret_warn_once))				\
		if (WARN_TAINT(!__warned, taint, format))	\
			__warned = true;			\
	unlikely(__ret_warn_once);				\
})

#define WARN_ON_RATELIMIT(condition, state)			\
		WARN_ON((condition) && __ratelimit(state))

#ifdef CONFIG_SMP
# define WARN_ON_SMP(x)			WARN_ON(x)
#else
# define WARN_ON_SMP(x)			do { } while (0)
#endif

#endif