From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 11E7EC64E7A for ; Wed, 25 Nov 2020 09:57:26 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 94B02206B7 for ; Wed, 25 Nov 2020 09:57:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="rmahdoLS" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 94B02206B7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=telegraphics.com.au Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:Message-ID:In-Reply-To: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=1dqK8Y3evpjh2lAUiTseNDMvgmqaMDbQjZL4TchYZ7k=; b=rmahdoLSOwm8qby0A2tG29u1F p8mIGZ5CT3iIpQB/UyGWJa8WUw6kveZ4VSS9OLI7QIEHkJb7F78of5pH89j0fmI2Fmd/3GYJ3Opgw fey64h9zxY1/Iceno/TpQHtMLY5cPnHH5JesTMzonIXN14Nkb4d6gMSWHDpcGPil7xX7ul/Fef55r ekTxEeDU3A/KYT46ua5kLoY8PO69Cdxr+83XHypl/aMr2Ha5DRm7U2GP4il0CVnXo0az3rTHqvRp2 vQlWhtwealyUi/L9L6+AoXaVPMFTmFWG3lgwYm8DzVXM8W0qY0glgQx6k00HGRnJp+5+2tGK+HNyq 8P3Z0I1IA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1khrYC-0006Ya-OG; Wed, 25 Nov 2020 09:57:24 +0000 Received: from kvm5.telegraphics.com.au ([98.124.60.144]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1khONj-0006Uj-Na; Tue, 24 Nov 2020 02:48:40 +0000 Received: from localhost (localhost.localdomain [127.0.0.1]) by kvm5.telegraphics.com.au (Postfix) with ESMTP id EF15F2AA0D; Mon, 23 Nov 2020 21:48:35 -0500 (EST) Date: Tue, 24 Nov 2020 13:48:34 +1100 (AEDT) From: Finn Thain To: Joe Perches Subject: Re: [PATCH 000/141] Fix fall-through warnings for Clang In-Reply-To: Message-ID: References: <20201120105344.4345c14e@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> <202011201129.B13FDB3C@keescook> <20201120115142.292999b2@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> <202011220816.8B6591A@keescook> <9b57fd4914b46f38d54087d75e072d6e947cb56d.camel@HansenPartnership.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201123_214839_818846_C9FE987B X-CRM114-Status: UNSURE ( 9.93 ) X-CRM114-Notice: Please train this message. X-Mailman-Approved-At: Wed, 25 Nov 2020 04:56:59 -0500 X-BeenThere: linux-i3c@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: alsa-devel@alsa-project.org, linux-atm-general@lists.sourceforge.net, reiserfs-devel@vger.kernel.org, linux-iio@vger.kernel.org, linux-wireless , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel , James Bottomley , linux-ide@vger.kernel.org, dm-devel@redhat.com, keyrings@vger.kernel.org, linux-mtd@lists.infradead.org, GR-everest-linux-l2@marvell.com, wcn36xx@lists.infradead.org, samba-technical@lists.samba.org, linux-i3c@lists.infradead.org, linux1394-devel@lists.sourceforge.net, linux-afs@lists.infradead.org, usb-storage@lists.one-eyed-alien.net, drbd-dev@lists.linbit.com, devel@driverdev.osuosl.org, linux-cifs@vger.kernel.org, rds-devel@oss.oracle.com, Nick Desaulniers , linux-scsi@vger.kernel.org, Nathan Chancellor , linux-rdma@vger.kernel.org, oss-drivers@netronome.com, bridge@lists.linux-foundation.org, linux-security-module@vger.kernel.org, amd-gfx@lists.freedesktop.org, linux-stm32@st-md-mailman.stormreply.com, cluster-devel@redhat.com, linux-acpi@vger.kernel.org, coreteam@netfilter.org, intel-wired-lan@lists.osuosl.org, linux-input , Miguel Ojeda , Jakub Kicinski , Ext4 Developers List , Linux Media Mailing List , Kees Cook , selinux@vger.kernel.org, linux-arm-msm@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-geode@lists.infradead.org, linux-can@vger.kernel.org, linux-block@vger.kernel.org, linux-gpio@vger.kernel.org, op-tee@lists.trustedfirmware.org, linux-mediatek@lists.infradead.org, xen-devel@lists.xenproject.org, nouveau@lists.freedesktop.org, linux-hams@vger.kernel.org, ceph-devel@vger.kernel.org, virtualization@lists.linux-foundation.org, Linux ARM , linux-hwmon@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-nfs@vger.kernel.org, GR-Linux-NIC-Dev@marvell.com, tipc-discussion@lists.sourceforge.net, Linux-MM , Network Development , linux-decnet-user@lists.sourceforge.net, linux-mmc@vger.kernel.org, "Gustavo A. R. Silva" , "maintainer:X86 ARCHITECTURE \(32-BIT AND 64-BIT\)" , linux-renesas-soc@vger.kernel.org, Miguel Ojeda , linux-sctp@vger.kernel.org, linux-usb@vger.kernel.org, netfilter-devel@vger.kernel.org, Linux Crypto Mailing List , patches@opensource.cirrus.com, linux-integrity@vger.kernel.org, target-devel@vger.kernel.org, linux-hardening@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org On Mon, 23 Nov 2020, Joe Perches wrote: > On Tue, 2020-11-24 at 11:58 +1100, Finn Thain wrote: > > it's not for me to prove that such patches don't affect code > > generation. That's for the patch author and (unfortunately) for > > reviewers. > > Ideally, that proof would be provided by the compilation system itself > and not patch authors nor reviewers nor maintainers. > > Unfortunately gcc does not guarantee repeatability or deterministic > output. To my knowledge, neither does clang. > Yes, I've said the same thing myself. But having attempted it, I now think this is a hard problem. YMMV. https://lore.kernel.org/linux-scsi/alpine.LNX.2.22.394.2004281017310.12@nippy.intranet/ https://lore.kernel.org/linux-scsi/alpine.LNX.2.22.394.2005211358460.8@nippy.intranet/ -- linux-i3c mailing list linux-i3c@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-i3c