From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935224Ab3DKRY6 (ORCPT ); Thu, 11 Apr 2013 13:24:58 -0400 Received: from home.bethel-hill.org ([63.228.164.32]:52318 "EHLO home.bethel-hill.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933562Ab3DKRY5 (ORCPT ); Thu, 11 Apr 2013 13:24:57 -0400 X-Greylist: delayed 1147 seconds by postgrey-1.27 at vger.kernel.org; Thu, 11 Apr 2013 13:24:57 EDT Message-ID: <5166ED66.7020307@realitydiluted.com> Date: Thu, 11 Apr 2013 12:05:42 -0500 From: "Steven J. Hill" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130308 Thunderbird/17.0.4 MIME-Version: 1.0 To: Huacai Chen CC: Ralf Baechle , linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, Fuxin Zhang , Zhangjin Wu , Hongliang Tao , Hua Yan Subject: Re: [PATCH V9 03/13] MIPS: Loongson: Introduce and use cpu_has_coherent_cache feature References: <1359527106-22879-1-git-send-email-chenhc@lemote.com> <1359527106-22879-4-git-send-email-chenhc@lemote.com> In-Reply-To: <1359527106-22879-4-git-send-email-chenhc@lemote.com> X-Enigmail-Version: 1.5.1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 01/30/2013 12:24 AM, Huacai Chen wrote: > Loongson-3 maintains cache coherency by hardware. So we introduce a cpu > feature named cpu_has_coherent_cache and use it to modify MIPS's cache > flushing functions. > > Signed-off-by: Huacai Chen Signed-off-by: Hongliang Tao > Signed-off-by: Hua Yan --- > arch/mips/include/asm/cacheflush.h | 6 +++++ > arch/mips/include/asm/cpu-features.h | 3 ++ > .../asm/mach-loongson/cpu-feature-overrides.h | 6 +++++ > arch/mips/mm/c-r4k.c | 21 > ++++++++++++++++++- 4 files changed, 34 insertions(+), 2 deletions(-) > Hello. This patch masks the problem that you are not properly probing your L1 caches to start with. For some reason in 'probe_pcache()' you reach the default case where the primary data cache is marked as having aliases. If your CPU truly is HW coherent with no aliases, then MIPS_CACHE_ALIASES should never get set. Fixing this would eliminate the 'arch/mips/include/asm/cacheflush.h' and 'arch/mips/mm/c-r4k.c' changes completely. There is no need to add more CPU feature bits for this single platform, thus changes to 'cpu-features.h' and 'cpu-features-overrides.h' will not be accepted. Also, please do not copy the mailing list unless your patch touches files outside of 'arch/mips' in order to cut down traffic on an already busy list. Thanks. Steve - ----- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iEYEARECAAYFAlFm7WAACgkQgyK5H2Ic36eHuwCeKZjp1+arkoheEpeuzjJkQskN /7MAnig14A03hWxRvfqDOMbMFKXpZBO8 =HRPU -----END PGP SIGNATURE-----