#ifndef _LINUX_BUG_H
  #define _LINUX_BUG_H
  
  #include <asm/bug.h>
  #include <linux/compiler.h>
  
  enum bug_trap_type {
  	BUG_TRAP_TYPE_NONE = 0,
  	BUG_TRAP_TYPE_WARN = 1,
  	BUG_TRAP_TYPE_BUG = 2,
  };
  
  struct pt_regs;
  
  #ifdef __CHECKER__
  #define BUILD_BUG_ON_NOT_POWER_OF_2(n) (0)
  #define BUILD_BUG_ON_ZERO(e) (0)
  #define BUILD_BUG_ON_NULL(e) ((void*)0)
  #define BUILD_BUG_ON_INVALID(e) (0)
  #define BUILD_BUG_ON_MSG(cond, msg) (0)
  #define BUILD_BUG_ON(condition) (0)
  #define BUILD_BUG() (0)
  #else /* __CHECKER__ */
  
  /* Force a compilation error if a constant expression is not a power of 2 */
  #define BUILD_BUG_ON_NOT_POWER_OF_2(n)			\
  	BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
  
  /* Force a compilation error if condition is true, but also produce a
     result (of value 0 and type size_t), so the expression can be used
     e.g. in a structure initializer (or where-ever else comma expressions
     aren't permitted). */
  #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
  #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
  
  /*
   * BUILD_BUG_ON_INVALID() permits the compiler to check the validity of the
   * expression but avoids the generation of any code, even if that expression
   * has side-effects.
   */
  #define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e))))
  
  /**
   * BUILD_BUG_ON_MSG - break compile if a condition is true & emit supplied
   *		      error message.
   * @condition: the condition which the compiler should know is false.
   *
   * See BUILD_BUG_ON for description.
   */
  #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
  
  /**
   * BUILD_BUG_ON - break compile if a condition is true.
   * @condition: the condition which the compiler should know is false.
   *
   * If you have some code which relies on certain constants being equal, or
   * some other compile-time-evaluated condition, you should use BUILD_BUG_ON to
   * detect if someone changes it.
   *
   * The implementation uses gcc's reluctance to create a negative array, but gcc
   * (as of 4.4) only emits that error for obvious cases (e.g. not arguments to
   * inline functions).  Luckily, in 4.3 they added the "error" function
   * attribute just for this type of case.  Thus, we use a negative sized array
   * (should always create an error on gcc versions older than 4.4) and then call
   * an undefined function with the error attribute (should always create an
   * error on gcc 4.3 and later).  If for some reason, neither creates a
   * compile-time error, we'll still have a link-time error, which is harder to
   * track down.
   */
  #ifndef __OPTIMIZE__
  #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
  #else
  #define BUILD_BUG_ON(condition) \
  	BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
  #endif
  
  /**
   * BUILD_BUG - break compile if used.
   *
   * If you have some code that you expect the compiler to eliminate at
   * build time, you should use BUILD_BUG to detect if it is
   * unexpectedly used.
   */
  #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
  
  #endif	/* __CHECKER__ */
  
  #ifdef CONFIG_GENERIC_BUG
  #include <asm-generic/bug.h>
  
  static inline int is_warning_bug(const struct bug_entry *bug)
  {
  	return bug->flags & BUGFLAG_WARNING;
  }
  
  const struct bug_entry *find_bug(unsigned long bugaddr);
  
  enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs);
  
  /* These are defined by the architecture */
  int is_valid_bugaddr(unsigned long addr);
  
  #else	/* !CONFIG_GENERIC_BUG */
  
  static inline enum bug_trap_type report_bug(unsigned long bug_addr,
  					    struct pt_regs *regs)
  {
  	return BUG_TRAP_TYPE_BUG;
  }
  
  #endif	/* CONFIG_GENERIC_BUG */
  #endif	/* _LINUX_BUG_H */