From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964842Ab2JETn5 (ORCPT ); Fri, 5 Oct 2012 15:43:57 -0400 Received: from nm38-vm7.bullet.mail.bf1.yahoo.com ([72.30.239.23]:35641 "EHLO nm38-vm7.bullet.mail.bf1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964827Ab2JETnw (ORCPT ); Fri, 5 Oct 2012 15:43:52 -0400 X-Yahoo-Newman-Id: 938303.95489.bm@omp1019.access.mail.mud.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: soLP6TcVM1l6sTdd.xqb.33X0HRJErLJa3.y8kKl9KXSJjJ z9CTxhpQ4UEol6KWOsXNTI1ueQJbw42QvrB8gF_MAXdzNczO2LRwuA3NEKQC PthMbzZQ5E8lBdLu8hNWnLpuXZmYXns8jTxzZzq5OAsf58HzTnTaaX8EWQq1 jCAzvjN31qBJG1Gq5xdzq__kRI1B6E6TXI.MdzL.SXvRkELTexa12nLCIeH4 wFhm4jXA1Pb3Y0IVedgY34nwvsQQiqC7JftF0MtNrZfSFDVrEsrd624C4kq1 fIT0z7uM8D_crrcxzaySCQkyEJyMljolwovkjf0ai5pKVdsljh9qA8a3t75M 8LOaj_wgP5gWqOF4n_QXfpS3eLium3hlda4nfu0154zSLo3d8rwvmZmDvVGD UVzainANOvk.Br94qKkoqvlUTCgxKiN.uVcsrEws2Ln_5KCKtsMXp X-Yahoo-SMTP: xXkkXk6swBBAi.5wfkIWFW3ugxbrqyhyk_b4Z25Sfu.XGQ-- From: danielfsantos@att.net To: LKML Cc: Andi Kleen , Andrea Arcangeli , Andrew Morton , Borislav Petkov , Christopher Li , David Daney , David Howells , David Rientjes , Joe Perches , Konstantin Khlebnikov , linux-sparse@vger.kernel.org, Michel Lespinasse , Paul Gortmaker , Pavel Pisa , Peter Zijlstra , Steven Rostedt , Daniel Santos Subject: [PATCH v2 09/10] bug.h: Add BUILD_BUG_ON_MSG & BUILD_BUG_INTERNAL{,2} Date: Fri, 5 Oct 2012 14:42:48 -0500 Message-Id: <1349466169-20637-9-git-send-email-daniel.santos@pobox.com> X-Mailer: git-send-email 1.7.3.4 In-Reply-To: <1349465759-20524-1-git-send-email-daniel.santos@pobox.com> References: <1349465759-20524-1-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 turned 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{,2}, which does the actual work and is pretty-much identical to BUILD_BUG_ON. Signed-off-by: Daniel Santos --- include/linux/bug.h | 26 ++++++++++++++++++++++++++ 1 files changed, 26 insertions(+), 0 deletions(-) diff --git a/include/linux/bug.h b/include/linux/bug.h index 1b43ea2..91bd9d5 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 +39,31 @@ struct pt_regs; */ #define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e)))) +#define _CONCAT1(a, b) a##b +#define CONCAT(a, b) _CONCAT1(a, b) +#define UNIQUIFY(prefix) CONCAT(prefix, __LINE__) + +#define BUILD_BUG_INTERNAL2(condition, msg, fn) \ + do { \ + extern void fn (void) __compiletime_error(msg); \ + __compiletime_error_fallback(condition); \ + if (condition) \ + fn(); \ + } while (0) + +#define BUILD_BUG_INTERNAL(condition, msg, fn) \ + BUILD_BUG_INTERNAL2(condition, msg, fn) + +/** + * 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, UNIQUIFY(__build_bug_on_failed_)) + /** * BUILD_BUG_ON - break compile if a condition is true. * @condition: the condition which the compiler should know is false. -- 1.7.3.4