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 Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C27D2C48297 for ; Mon, 12 Feb 2024 18:00:33 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4TYXLS3Vrvz3h05 for ; Tue, 13 Feb 2024 05:00:32 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.crashing.org (client-ip=63.228.1.57; helo=gate.crashing.org; envelope-from=segher@kernel.crashing.org; receiver=lists.ozlabs.org) Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) by lists.ozlabs.org (Postfix) with ESMTP id 4TYXL03k6hz3cB0 for ; Tue, 13 Feb 2024 05:00:08 +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 41CHx6Yw014674; Mon, 12 Feb 2024 11:59:06 -0600 Received: (from segher@localhost) by gate.crashing.org (8.14.1/8.14.1/Submit) id 41CHx6WK014673; Mon, 12 Feb 2024 11:59:06 -0600 X-Authentication-Warning: gate.crashing.org: segher set sender to segher@kernel.crashing.org using -f Date: Mon, 12 Feb 2024 11:59:06 -0600 From: Segher Boessenkool To: Timothy Pearson Subject: Re: [PATCH] powerpc: Add gpr1 and fpu save/restore functions Message-ID: <20240212175906.GY19790@gate.crashing.org> References: <995988479.14839534.1707756078600.JavaMail.zimbra@raptorengineeringinc.com> <20240212170207.GW19790@gate.crashing.org> <1251499652.14843228.1707757778984.JavaMail.zimbra@raptorengineeringinc.com> <20240212173043.GX19790@gate.crashing.org> <572013249.14851324.1707759979044.JavaMail.zimbra@raptorengineeringinc.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <572013249.14851324.1707759979044.JavaMail.zimbra@raptorengineeringinc.com> 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: linuxppc-dev Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Mon, Feb 12, 2024 at 11:46:19AM -0600, Timothy Pearson wrote: > Interesting, that make sense. > > How should we proceed from the current situation? Bringing in libgcc seems > like a fairly invasive change, I have done it for *all* architectures some ten years ago. Never found any problem. > should we merge this to fix the current bug > (cannot build ppc64 kernel in size-optimized mode) and start discussion on > bringing in libgcc as the long-term fix across multiple architectures? > > My goal here is to not have to carry a downstream patch in perpetuity for > our embedded Linux firmware, which needs to be compiled in size-optimized > mode due to hardware Flash limitations. There are better options than -Os, fwiw. Some --param's give smaller *and* faster kernels. What exactly is best is heavily arch-dependent though (as well as dependent on the application code, the kernel code in this case) :-( Segher