From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753580Ab2KTVF0 (ORCPT ); Tue, 20 Nov 2012 16:05:26 -0500 Received: from nm19-vm0.access.bullet.mail.mud.yahoo.com ([66.94.236.25]:28500 "EHLO nm19-vm0.access.bullet.mail.mud.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753454Ab2KTVFV (ORCPT ); Tue, 20 Nov 2012 16:05:21 -0500 X-Yahoo-Newman-Id: 243390.4524.bm@smtp108.sbc.mail.bf1.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: UWyr_xQVM1lK1T1TRR43bupvc8b0I8ZjEMyDeN7_Vx_dWY1 cGsmh9ElF5D9VCRPUrxBDTiwpFcdW2x69.XxXR37SVSzUDMdbGuCHifx6dzQ rGycaIM1gjBnkpg8lmUsFlLbFMagTmq9wWIKTlLjgqUAlxDFwMYes3id8ldl OG_RDRxigUjM2XExtgD99IcVWiK7g8mFxdDGRnEW2.I4U2eoeQCGmRlhWNYJ mtOueZZYlRimXStpenJqMliXyPKvmD9Iknkc44yplNEP7VWoxutWEbPeHC4U HYRM2AiJpYkcQWWoRt89PVKp_npzKvjki_qyGWtC1B7ifRtg.i4Z8nT9Fh.z vUHsb1jyxx2vYwRC5e61CJ5U348HkLPIAk7xK1Jcuh_NJi2_QeTdECsUWMGh 5Lu4q8YcpBe3ruiqhHW5hLwEKgq207W2cfakJWc39MzxZC2juTVCq X-Yahoo-SMTP: xXkkXk6swBBAi.5wfkIWFW3ugxbrqyhyk_b4Z25Sfu.XGQ-- From: danielfsantos@att.net To: LKML , Andi Kleen , Andrea Arcangeli , Andrew Morton , Borislav Petkov , Christopher Li , David Daney , David Rientjes , Joe Perches , Josh Triplett , linux-sparse@vger.kernel.org, Michel Lespinasse , Paul Gortmaker , Peter Zijlstra , Steven Rostedt Cc: Daniel Santos Subject: [PATCH v6 6/9] bug.h: Prevent double evaulation of in BUILD_BUG_ON Date: Tue, 20 Nov 2012 15:05:04 -0600 Message-Id: <1353445507-7233-6-git-send-email-daniel.santos@pobox.com> X-Mailer: git-send-email 1.7.3.4 In-Reply-To: <1353444132-6809-1-git-send-email-daniel.santos@pobox.com> References: <1353444132-6809-1-git-send-email-daniel.santos@pobox.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When calling BUILD_BUG_ON in an optimized build using gcc 4.3 and later, the condition will be evaulated twice, possibily with side-effects. This patch eliminates that error. Signed-off-by: Daniel Santos --- include/linux/bug.h | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-) diff --git a/include/linux/bug.h b/include/linux/bug.h index 1b2465d..98bdbb3d 100644 --- a/include/linux/bug.h +++ b/include/linux/bug.h @@ -58,8 +58,9 @@ struct pt_regs; extern int __build_bug_on_failed; #define BUILD_BUG_ON(condition) \ do { \ - ((void)sizeof(char[1 - 2*!!(condition)])); \ - if (condition) __build_bug_on_failed = 1; \ + bool __cond = !!(condition); \ + ((void)sizeof(char[1 - 2 * __cond])); \ + if (__cond) __build_bug_on_failed = 1; \ } while(0) #endif -- 1.7.3.4