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Current File : //usr/src/kernels/3.10.0-957.10.1.el7.x86_64/include/asm-generic/bug.h
#ifndef _ASM_GENERIC_BUG_H
#define _ASM_GENERIC_BUG_H

#include <linux/compiler.h>

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

#ifndef __ASSEMBLY__
#include <linux/kernel.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__); \
	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
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
#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

/* used internally by panic.c */
struct warn_args;

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);					\
})

#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 __section(.data.unlikely) __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 __section(.data.unlikely) __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 __section(.data.unlikely) __warned;		\
	int __ret_warn_once = !!(condition);			\
								\
	if (unlikely(__ret_warn_once))				\
		if (WARN_TAINT(!__warned, taint, format))	\
			__warned = true;			\
	unlikely(__ret_warn_once);				\
})

/*
 * 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

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