From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935049Ab2JXQjr (ORCPT ); Wed, 24 Oct 2012 12:39:47 -0400 Received: from nm30-vm0.access.bullet.mail.sp2.yahoo.com ([98.139.44.194]:25206 "EHLO nm30-vm0.access.bullet.mail.sp2.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933811Ab2JXQjp (ORCPT ); Wed, 24 Oct 2012 12:39:45 -0400 X-Yahoo-Newman-Id: 852865.79197.bm@smtp105.sbc.mail.gq1.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: 0.0QFHkVM1m31ziTRQJvMHJZ.I5QmQlijKAO4Oj0.MxIBBS W_wwXUB2QE.EbxPKEgQNqlKzGIn0iOGmbwbANRzU2KDD.AX5WiXMhAjNKcOz qY.8lQIrMJDrVz3ZCooBeycGEWM8nnEzre4yPLep5_anIDXFbbHojbcFzGP6 8sEdW0dLNnXcL0DyVq_dlhvXSVSgbGSs0AQL9sg5boBLpwDmn9_8rGAD.Kck HldZnSsx7DBPpOc81Inw8I_F.dBg.5aJ0plr87MxFITQHu_NH9I1Au09tS3M bnQmXZzGiZq64HpMMoVmixwjmADRB.OLTdqR4zJ.DEWLvYGfgWhNf36vCml1 0HF9Z1j2c9pIyeC_hCB3DHFvjAYjNOb9q3wBzIwRuHn0KGb.54Dg4woOXDsS xCktZaQUxPXlhyvkqbLB5qkx74LV1q5lxAS.86zY8qnaqjtB7IOk8 X-Yahoo-SMTP: xXkkXk6swBBAi.5wfkIWFW3ugxbrqyhyk_b4Z25Sfu.XGQ-- From: danielfsantos@att.net 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 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> X-Mailer: git-send-email 1.7.3.4 In-Reply-To: <1351096132-12244-1-git-send-email-daniel.santos@pobox.com> References: <1351096132-12244-1-git-send-email-daniel.santos@pobox.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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