From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751833Ab1KILdJ (ORCPT ); Wed, 9 Nov 2011 06:33:09 -0500 Received: from mail.skyhub.de ([78.46.96.112]:45636 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751149Ab1KILdI (ORCPT ); Wed, 9 Nov 2011 06:33:08 -0500 Date: Wed, 9 Nov 2011 12:33:03 +0100 From: Borislav Petkov To: Dave Haywood Cc: Steven Rostedt , Linux Kernel Subject: Re: Build warning: kernel/trace/trace.c (v3.2-rc1-90-g19e0baf) Message-ID: <20111109113303.GA18508@gere.osrc.amd.com> References: <4EBA3E3E.9060402@oak.selfip.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <4EBA3E3E.9060402@oak.selfip.net> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Nov 09, 2011 at 08:47:58AM +0000, Dave Haywood wrote: > Hi, > > Noticed this new warning in the build of kernel v3.2-rc1-90-g19e0baf: > > CC kernel/trace/trace.o > kernel/trace/trace.c: In function 'tracing_mark_write': > kernel/trace/trace.c:3644:8: warning: 'page2' may be used uninitialized in this function That has to be gcc 4.5.x something. 4.6 is smarter in that aspect: $ make CC=gcc-4.6 kernel/trace/trace.o CHK include/linux/version.h UPD include/linux/version.h CHK include/generated/utsrelease.h UPD include/generated/utsrelease.h CC kernel/bounds.s ... HOSTLD scripts/mod/modpost CC kernel/trace/trace.o $ make CC=gcc-4.5 kernel/trace/trace.o CHK include/linux/version.h CHK include/generated/utsrelease.h CC kernel/bounds.s ... HOSTLD scripts/mod/modpost CC kernel/trace/trace.o kernel/trace/trace.c: In function ‘tracing_mark_write’: kernel/trace/trace.c:3644:8: warning: ‘page2’ may be used uninitialized in this function HTH -- Regards/Gruss, Boris.