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author | Tom Rini <trini@konsulko.com> | 2023-07-10 21:29:14 +0300 |
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committer | Tom Rini <trini@konsulko.com> | 2023-07-10 21:29:14 +0300 |
commit | 146a82c017d51eb2c3b8be33854f200f1e52a1cb (patch) | |
tree | c2bb134d105bcc9855e6c39ac5b422e5416735ff /include/linux/build_bug.h | |
parent | 05aa6516c6bb419d01d69fac457c0de563bfd694 (diff) | |
parent | 76c61f29d63163d178b1584ecc9fc2c96c538ff0 (diff) | |
download | u-boot-146a82c017d51eb2c3b8be33854f200f1e52a1cb.tar.xz |
Merge branch 'next'
Diffstat (limited to 'include/linux/build_bug.h')
-rw-r--r-- | include/linux/build_bug.h | 40 |
1 files changed, 8 insertions, 32 deletions
diff --git a/include/linux/build_bug.h b/include/linux/build_bug.h index 9c7088bafa..20c2dc7f4b 100644 --- a/include/linux/build_bug.h +++ b/include/linux/build_bug.h @@ -4,15 +4,16 @@ #include <linux/compiler.h> #ifdef __CHECKER__ -#define __BUILD_BUG_ON_NOT_POWER_OF_2(n) (0) -#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 condition is true, but also produce a + * result (of value 0 and type int), 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) ((int)sizeof(struct { int:(-!!(e)); })) +#endif /* __CHECKER__ */ /* Force a compilation error if a constant expression is not a power of 2 */ #define __BUILD_BUG_ON_NOT_POWER_OF_2(n) \ @@ -21,15 +22,6 @@ 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. @@ -52,23 +44,9 @@ * 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. @@ -98,6 +76,4 @@ #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr) #define __static_assert(expr, msg, ...) _Static_assert(expr, msg) -#endif /* __CHECKER__ */ - #endif /* _LINUX_BUILD_BUG_H */ |