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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_MUTT autolearn=ham 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 5BA16C43441 for ; Wed, 10 Oct 2018 22:07:13 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (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 DA0142086E for ; Wed, 10 Oct 2018 22:07:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DA0142086E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 42Vp9V5wgjzF27h for ; Thu, 11 Oct 2018 09:07:10 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org Authentication-Results: lists.ozlabs.org; spf=permerror (mailfrom) smtp.mailfrom=kernel.crashing.org (client-ip=63.228.1.57; helo=gate.crashing.org; envelope-from=segher@kernel.crashing.org; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 42Vp7Q6NTKzF14w for ; Thu, 11 Oct 2018 09:05:22 +1100 (AEDT) Received: from gate.crashing.org (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.14.1) with ESMTP id w9AM5BTT023247; Wed, 10 Oct 2018 17:05:11 -0500 Received: (from segher@localhost) by gate.crashing.org (8.14.1/8.14.1/Submit) id w9AM59YW023230; Wed, 10 Oct 2018 17:05:09 -0500 X-Authentication-Warning: gate.crashing.org: segher set sender to segher@kernel.crashing.org using -f Date: Wed, 10 Oct 2018 17:05:09 -0500 From: Segher Boessenkool To: Joel Stanley Subject: Re: [PATCH 1/2] powerpc/boot: Disable vector instructions Message-ID: <20181010220509.GF29268@gate.crashing.org> References: <20181010024523.4921-1-joel@jms.id.au> <20181010024523.4921-2-joel@jms.id.au> <87lg762e94.fsf@concordia.ellerman.id.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.3i X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Oliver O'Halloran , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Thu, Oct 11, 2018 at 08:22:54AM +1030, Joel Stanley wrote: > On Wed, 10 Oct 2018 at 22:41, Michael Ellerman wrote: > > Joel Stanley writes: > > > BOOTCFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ > > > - -fno-strict-aliasing -Os -msoft-float -pipe \ > > > - -fomit-frame-pointer -fno-builtin -fPIC -nostdinc \ > > > + -fno-strict-aliasing -Os -msoft-float -mno-altivec -mno-vsx \ > > > > That's going to break if the compiler doesn't understand -mno-vsx isn't it? > > > > I'm not sure if "support" a compiler that old though. > > Segher, the kernel mandates 4.6 as the minimum. Do we need to worry > about the compiler not supporting -mno-altivec -mno-vsx? -mvsx is gcc 4.5 and later. https://www.gnu.org/software/gcc/gcc-4.5/changes.html -maltivec is... Hrm, not so easy to find... gcc 3.1 and later it seems. https://www.gnu.org/software/gcc/gcc-3.1/changes.html You should be fine. Segher