Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758991AbXIBUeq (ORCPT ); Sun, 2 Sep 2007 16:34:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751228AbXIBUej (ORCPT ); Sun, 2 Sep 2007 16:34:39 -0400 Received: from srv5.dvmed.net ([207.36.208.214]:39363 "EHLO mail.dvmed.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750989AbXIBUei (ORCPT ); Sun, 2 Sep 2007 16:34:38 -0400 Message-ID: <46DB1E5C.2080107@garzik.org> Date: Sun, 02 Sep 2007 16:34:36 -0400 From: Jeff Garzik User-Agent: Thunderbird 2.0.0.5 (X11/20070719) MIME-Version: 1.0 To: Satyam Sharma CC: Linux Kernel Mailing List , Alasdair G Kergon , dm-devel@redhat.com, Andrew Morton Subject: Re: [PATCH -mm] drivers/md/: Shut up uninitialized variable warnings References: In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Score: -4.3 (----) X-Spam-Report: SpamAssassin version 3.1.9 on srv5.dvmed.net summary: Content analysis details: (-4.3 points, 5.0 required) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1555 Lines: 42 Satyam Sharma wrote: > drivers/md/dm-exception-store.c: In function ?persistent_read_metadata?: > drivers/md/dm-exception-store.c:452: warning: ?new_snapshot? may be used uninitialized in this function > > drivers/md/dm-ioctl.c: In function ?ctl_ioctl?: > drivers/md/dm-ioctl.c:1407: warning: ?param? may be used uninitialized in this function > > [ For these, I'd like to especially add -- shame on you, gcc! ] > > drivers/md/dm-table.c: In function ?dm_get_device?: > drivers/md/dm-table.c:472: warning: ?dev? may be used uninitialized in this function > > are all verified to be bogus warnings. Let's shut them up. > > --- > > drivers/md/dm-exception-store.c | 3 ++- > drivers/md/dm-ioctl.c | 2 +- > drivers/md/dm-table.c | 2 +- > 3 file changed, 4 insertions(+), 3 deletion(-) same comment as with the last uninit'd var patch: these markers should be used sparingly. Try it on multiple compiler versions, see if it's a new behavior. Quite realistically, you might actually be finding gcc bugs, implying the proper path is to file a gcc bug report (and they are _very_ diligent about handling these, its impressive) rather than to patch the Linux kernel. Overall, for any uninitialized_var() patch, we need more info on platform/compiler version/analysis methods/etc. Jeff - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/