]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/linux/bug.h
7 BUG_TRAP_TYPE_NONE
= 0,
8 BUG_TRAP_TYPE_WARN
= 1,
15 #define BUILD_BUG_ON_NOT_POWER_OF_2(n)
16 #define BUILD_BUG_ON_ZERO(e) (0)
17 #define BUILD_BUG_ON_NULL(e) ((void*)0)
18 #define BUILD_BUG_ON_INVALID(e) (0)
19 #define BUILD_BUG_ON(condition)
20 #define BUILD_BUG() (0)
21 #else /* __CHECKER__ */
23 /* Force a compilation error if a constant expression is not a power of 2 */
24 #define BUILD_BUG_ON_NOT_POWER_OF_2(n) \
25 BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
27 /* Force a compilation error if condition is true, but also produce a
28 result (of value 0 and type size_t), so the expression can be used
29 e.g. in a structure initializer (or where-ever else comma expressions
31 #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
32 #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
35 * BUILD_BUG_ON_INVALID() permits the compiler to check the validity of the
36 * expression but avoids the generation of any code, even if that expression
39 #define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e))))
42 * BUILD_BUG_ON - break compile if a condition is true.
43 * @condition: the condition which the compiler should know is false.
45 * If you have some code which relies on certain constants being equal, or
46 * other compile-time-evaluated condition, you should use BUILD_BUG_ON to
47 * detect if someone changes it.
49 * The implementation uses gcc's reluctance to create a negative array, but
50 * gcc (as of 4.4) only emits that error for obvious cases (eg. not arguments
51 * to inline functions). So as a fallback we use the optimizer; if it can't
52 * prove the condition is false, it will cause a link error on the undefined
53 * "__build_bug_on_failed". This error message can be harder to track down
54 * though, hence the two different methods.
57 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
59 extern int __build_bug_on_failed
;
60 #define BUILD_BUG_ON(condition) \
62 ((void)sizeof(char[1 - 2*!!(condition)])); \
63 if (condition) __build_bug_on_failed = 1; \
68 * BUILD_BUG - break compile if used.
70 * If you have some code that you expect the compiler to eliminate at
71 * build time, you should use BUILD_BUG to detect if it is
76 extern void __build_bug_failed(void) \
77 __linktime_error("BUILD_BUG failed"); \
78 __build_bug_failed(); \
81 #endif /* __CHECKER__ */
83 #ifdef CONFIG_GENERIC_BUG
84 #include <asm-generic/bug.h>
86 static inline int is_warning_bug(const struct bug_entry
*bug
)
88 return bug
->flags
& BUGFLAG_WARNING
;
91 const struct bug_entry
*find_bug(unsigned long bugaddr
);
93 enum bug_trap_type
report_bug(unsigned long bug_addr
, struct pt_regs
*regs
);
95 /* These are defined by the architecture */
96 int is_valid_bugaddr(unsigned long addr
);
98 #else /* !CONFIG_GENERIC_BUG */
100 static inline enum bug_trap_type
report_bug(unsigned long bug_addr
,
101 struct pt_regs
*regs
)
103 return BUG_TRAP_TYPE_BUG
;
106 #endif /* CONFIG_GENERIC_BUG */
107 #endif /* _LINUX_BUG_H */