Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755838AbaJNXiK (ORCPT ); Tue, 14 Oct 2014 19:38:10 -0400 Received: from gw-1.arm.linux.org.uk ([78.32.30.217]:34435 "EHLO pandora.arm.linux.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755519AbaJNXiI (ORCPT ); Tue, 14 Oct 2014 19:38:08 -0400 Date: Wed, 15 Oct 2014 00:37:56 +0100 From: Russell King - ARM Linux To: Kever Yang Cc: Heiko =?iso-8859-1?Q?St=FCbner?= , Doug Anderson , Tao Huang , Addy Ke , "linux-kernel@vger.kernel.org" , linux-rockchip@lists.infradead.org, Jianqun Xu , Eddie Cai , han jiang , Sonny Rao , "linux-arm-kernel@lists.infradead.org" Subject: Re: [PATCH v4 4/6] ARM: rockchip: add basic smp support for rk3288 Message-ID: <20141014233756.GH27405@n2100.arm.linux.org.uk> References: <1413231122-1770-1-git-send-email-kever.yang@rock-chips.com> <1413231122-1770-5-git-send-email-kever.yang@rock-chips.com> <1453932.GC4UXrUPRz@phil> <543D9A8F.3040304@rock-chips.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <543D9A8F.3040304@rock-chips.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 14, 2014 at 02:50:07PM -0700, Kever Yang wrote: > Heiko, > > On 10/14/2014 02:23 PM, Heiko St?bner wrote: > >Am Dienstag, 14. Oktober 2014, 13:24:03 schrieb Doug Anderson: > >>Kever, > >> > >>On Mon, Oct 13, 2014 at 1:12 PM, Kever Yang > >wrote: > >>>+ /* > >>>+ * We need to soft reset the cpu when we turn off the cpu power > >>>domain, + * or else the active processors might be stalled when > >>>the individual + * processor is powered down. > >>>+ */ > >>>+ if (read_cpuid_part_number() != ARM_CPU_PART_CORTEX_A9) { > >>I haven't done a full review of this patch, but it seems unlikely that > >>your uses of read_cpuid_part_number() and read_cpuid_part() in this > >>patch are correct. You use both functions and in both cases compare > >>the results to ARM_CPU_PART_CORTEX_A9. > >I think read_cpuid_part() would be the correct one, as it does > You are right, read_cpuid_part() is correct one on kernel next, > I mix up 3.14 kernel and next tree, only read_cpuid_part_number() is > available > in 3.14 kernel. > > I will correct it in my next version, any other changes needed for new > version? You need to at the _very_ _minimum_ build test your code against a recent kernel, and preferably test it to make sure that it works as you intend. Developing on such an old kernel version, and hoping that the code is going to be correct for later kernels isn't a nice idea. -- FTTC broadband for 0.8mile line: currently at 9.5Mbps down 400kbps up according to speedtest.net. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/