Add BUILD_BUG_ON_MSG which behaves like BUILD_BUG_ON (with optimizations enabled), except that it allows you to specify the error message you want emitted as the third parameter. Under the hood, this relies on _BUILD_BUG_INTERNAL, which does the actual work and is pretty-much identical to BUILD_BUG_ON.
Signed-off-by: Daniel Santos <[email protected]> --- include/linux/bug.h | 22 ++++++++++++++++++++++ 1 files changed, 22 insertions(+), 0 deletions(-) diff --git a/include/linux/bug.h b/include/linux/bug.h index 1b43ea2..f6f81f6 100644 --- a/include/linux/bug.h +++ b/include/linux/bug.h @@ -16,6 +16,7 @@ struct pt_regs; #define BUILD_BUG_ON_NOT_POWER_OF_2(n) #define BUILD_BUG_ON_ZERO(e) (0) #define BUILD_BUG_ON_NULL(e) ((void*)0) +#define BUILD_BUG_ON_MSG(cond, msg) (0) #define BUILD_BUG_ON(condition) (0) #define BUILD_BUG() (0) #else /* __CHECKER__ */ @@ -38,6 +39,27 @@ struct pt_regs; */ #define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e)))) +#define __BUILD_BUG_INTERNAL(condition, msg, line) \ + do { \ + extern void __build_bug_on_failed_ ## line \ + (void) __compiletime_error(msg); \ + __compiletime_error_fallback(condition); \ + if (condition) \ + __build_bug_on_failed_ ## line(); \ + } while (0) + +#define _BUILD_BUG_INTERNAL(condition, msg, line) \ + __BUILD_BUG_INTERNAL(condition, msg, line) + +/** + * 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) _BUILD_BUG_INTERNAL(cond, msg, __LINE__) + /** * BUILD_BUG_ON - break compile if a condition is true. * @condition: the condition which the compiler should know is false. -- 1.7.3.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
