From mboxrd@z Thu Jan 1 00:00:00 1970 From: danielfsantos@att.net Subject: [PATCH v3 09/10] bug.h: Add BUILD_BUG_ON_MSG & _BUILD_BUG_INTERNAL Date: Wed, 24 Oct 2012 11:34:00 -0500 Message-ID: <1351096441-12388-9-git-send-email-daniel.santos@pobox.com> References: <1351096132-12244-1-git-send-email-daniel.santos@pobox.com> Return-path: Received: from nm30-vm0.access.bullet.mail.sp2.yahoo.com ([98.139.44.194]:25202 "EHLO nm30-vm0.access.bullet.mail.sp2.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933556Ab2JXQjp (ORCPT ); Wed, 24 Oct 2012 12:39:45 -0400 In-Reply-To: <1351096132-12244-1-git-send-email-daniel.santos@pobox.com> Sender: linux-sparse-owner@vger.kernel.org List-Id: linux-sparse@vger.kernel.org To: LKML , Andi Kleen , Andrea Arcangeli , Andrew Morton , Christopher Li , Daniel Santos , David Daney , David Howells , Joe Perches , Josh Triplett , Konstantin Khlebnikov , linux-sparse@vger.kernel.org, Michel Lespinasse , Paul Gortmaker , Pavel Pisa , Peter Zijlstra , Steven Rostedt , Borislav Petkov , David Rientjes 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 --- 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