From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965943AbcIWM3v (ORCPT ); Fri, 23 Sep 2016 08:29:51 -0400 Received: from foss.arm.com ([217.140.101.70]:58056 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964828AbcIWM3s (ORCPT ); Fri, 23 Sep 2016 08:29:48 -0400 Date: Fri, 23 Sep 2016 13:29:21 +0100 From: Mark Rutland To: Alison Wang Cc: shawnguo@kernel.org, kernel@pengutronix.de, fabio.estevam@nxp.com, linux@armlinux.org.uk, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, scott.wood@nxp.com, stuart.yoder@nxp.com, leoyang.li@nxp.com, jason.jin@nxp.com Subject: Re: [PATCH 2/2] armv8: aarch32: Add SMP support for 32-bit Linux kernel Message-ID: <20160923122921.GD10042@leverpostej> References: <1474597146-33312-1-git-send-email-b18965@freescale.com> <1474597146-33312-2-git-send-email-b18965@freescale.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1474597146-33312-2-git-send-email-b18965@freescale.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Sep 23, 2016 at 10:19:06AM +0800, Alison Wang wrote: > The patch adds SMP support for running 32-bit Linux kernel for > Layerscape platforms. Spin-table method is used for SMP support. So far, spin-table has not been defined for 32-bit, and the code below, while mostly a copy of the 64-bit code, is somewhat different. If you want a common enable method, I would strongly advise that you use PSCI, which is well-defined for both 32-bit and 64-bit. There are a number of problems with spin-table, and I would not recommend extending it to 32-bit ARM. Thanks, Mark.