From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752749Ab2GKI4A (ORCPT ); Wed, 11 Jul 2012 04:56:00 -0400 Received: from cam-admin0.cambridge.arm.com ([217.140.96.50]:36967 "EHLO cam-admin0.cambridge.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751633Ab2GKIz6 (ORCPT ); Wed, 11 Jul 2012 04:55:58 -0400 Date: Wed, 11 Jul 2012 09:55:25 +0100 From: Catalin Marinas To: Ingo Molnar Cc: Arnd Bergmann , Alan Cox , Olof Johansson , "linux-kernel@vger.kernel.org" , Linus Torvalds , Russell King , Andrew Morton Subject: Re: [PATCH 00/36] AArch64 Linux kernel port Message-ID: <20120711085525.GA22437@arm.com> References: <1341608777-12982-1-git-send-email-catalin.marinas@arm.com> <20120710101018.GE15120@arm.com> <20120710163358.6ae4a576@pyramind.ukuu.org.uk> <201207101652.18401.arnd@arndb.de> <20120710203527.GA16986@gmail.com> <20120710214429.GA4733@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120710214429.GA4733@arm.com> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 10, 2012 at 10:44:29PM +0100, Catalin Marinas wrote: > On Tue, Jul 10, 2012 at 09:35:27PM +0100, Ingo Molnar wrote: > > Do you *really* think that all of the 32-bit ARM code should > > essentially be thrown away when going to 64-bit ARM, that > > patches can only touch arch/arm64/ + drivers/ or the highway? > > Definitely not, I don't think anyone claimed this. The 32-bit ARM code > will have the same important place for a very long time, ARM Ltd isn't > withdrawing support for this (it's the main revenue generator). I expect > to see many new 32-bit platforms to appear, MP systems, big.little > configurations etc. If there is need for bigger physical address space, > LPAE support (even with its drawbacks) is still the preferred choice for > mobile systems. Just to be clear in case it doesn't look aligned with Arnd's comment. I'm referring to the 32-bit ARM port - it has the same important place as before, nothing from the 32-bit architecture code is thrown away (over time, we may want to clean up old architecture versions but that's a normal thing). How the 32-bit ARM SoC is refactored and maintained it's up to the arm-soc team and they are doing a great job. -- Catalin