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  1. #ifndef _LINUX_BUG_H
  2. #define _LINUX_BUG_H
  3.  
  4. #include <asm/bug.h>
  5. #include <linux/compiler.h>
  6.  
  7. enum bug_trap_type {
  8.         BUG_TRAP_TYPE_NONE = 0,
  9.         BUG_TRAP_TYPE_WARN = 1,
  10.         BUG_TRAP_TYPE_BUG = 2,
  11. };
  12.  
  13. struct pt_regs;
  14.  
  15. #ifdef __CHECKER__
  16. #define BUILD_BUG_ON_NOT_POWER_OF_2(n) (0)
  17. #define BUILD_BUG_ON_ZERO(e) (0)
  18. #define BUILD_BUG_ON_NULL(e) ((void*)0)
  19. #define BUILD_BUG_ON_INVALID(e) (0)
  20. #define BUILD_BUG_ON_MSG(cond, msg) (0)
  21. #define BUILD_BUG_ON(condition) (0)
  22. #define BUILD_BUG() (0)
  23. #define MAYBE_BUILD_BUG_ON(cond) (0)
  24. #else /* __CHECKER__ */
  25.  
  26. /* Force a compilation error if a constant expression is not a power of 2 */
  27. #define BUILD_BUG_ON_NOT_POWER_OF_2(n)                  \
  28.         BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
  29.  
  30. /* Force a compilation error if condition is true, but also produce a
  31.    result (of value 0 and type size_t), so the expression can be used
  32.    e.g. in a structure initializer (or where-ever else comma expressions
  33.    aren't permitted). */
  34. #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
  35. #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
  36.  
  37. /*
  38.  * BUILD_BUG_ON_INVALID() permits the compiler to check the validity of the
  39.  * expression but avoids the generation of any code, even if that expression
  40.  * has side-effects.
  41.  */
  42. #define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e))))
  43.  
  44. /**
  45.  * BUILD_BUG_ON_MSG - break compile if a condition is true & emit supplied
  46.  *                    error message.
  47.  * @condition: the condition which the compiler should know is false.
  48.  *
  49.  * See BUILD_BUG_ON for description.
  50.  */
  51. #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
  52.  
  53. /**
  54.  * BUILD_BUG_ON - break compile if a condition is true.
  55.  * @condition: the condition which the compiler should know is false.
  56.  *
  57.  * If you have some code which relies on certain constants being equal, or
  58.  * some other compile-time-evaluated condition, you should use BUILD_BUG_ON to
  59.  * detect if someone changes it.
  60.  *
  61.  * The implementation uses gcc's reluctance to create a negative array, but gcc
  62.  * (as of 4.4) only emits that error for obvious cases (e.g. not arguments to
  63.  * inline functions).  Luckily, in 4.3 they added the "error" function
  64.  * attribute just for this type of case.  Thus, we use a negative sized array
  65.  * (should always create an error on gcc versions older than 4.4) and then call
  66.  * an undefined function with the error attribute (should always create an
  67.  * error on gcc 4.3 and later).  If for some reason, neither creates a
  68.  * compile-time error, we'll still have a link-time error, which is harder to
  69.  * track down.
  70.  */
  71. #ifndef __OPTIMIZE__
  72. #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
  73. #else
  74. #define BUILD_BUG_ON(condition) \
  75.         BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
  76. #endif
  77.  
  78. /**
  79.  * BUILD_BUG - break compile if used.
  80.  *
  81.  * If you have some code that you expect the compiler to eliminate at
  82.  * build time, you should use BUILD_BUG to detect if it is
  83.  * unexpectedly used.
  84.  */
  85. #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
  86.  
  87. #define MAYBE_BUILD_BUG_ON(cond)                        \
  88.         do {                                            \
  89.                 if (__builtin_constant_p((cond)))       \
  90.                         BUILD_BUG_ON(cond);             \
  91.                 else                                    \
  92.                         BUG_ON(cond);                   \
  93.         } while (0)
  94.  
  95. #endif  /* __CHECKER__ */
  96.  
  97. #ifdef CONFIG_GENERIC_BUG
  98. #include <asm-generic/bug.h>
  99.  
  100. static inline int is_warning_bug(const struct bug_entry *bug)
  101. {
  102.         return bug->flags & BUGFLAG_WARNING;
  103. }
  104.  
  105. const struct bug_entry *find_bug(unsigned long bugaddr);
  106.  
  107. enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs);
  108.  
  109. /* These are defined by the architecture */
  110. int is_valid_bugaddr(unsigned long addr);
  111.  
  112. #else   /* !CONFIG_GENERIC_BUG */
  113.  
  114. static inline enum bug_trap_type report_bug(unsigned long bug_addr,
  115.                                             struct pt_regs *regs)
  116. {
  117.         return BUG_TRAP_TYPE_BUG;
  118. }
  119.  
  120. #endif  /* CONFIG_GENERIC_BUG */
  121. #endif  /* _LINUX_BUG_H */
  122.