From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932298AbbAPBrE (ORCPT ); Thu, 15 Jan 2015 20:47:04 -0500 Received: from cnbjrel02.sonyericsson.com ([219.141.167.166]:19203 "EHLO cnbjrel02.sonyericsson.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752184AbbAPBrC (ORCPT ); Thu, 15 Jan 2015 20:47:02 -0500 From: "Wang, Yalin" To: "'Russell King - ARM Linux'" CC: "'Ard Biesheuvel'" , "'Will Deacon'" , "'linux-kernel@vger.kernel.org'" , "'akinobu.mita@gmail.com'" , "'linux-mm@kvack.org'" , "'Joe Perches'" , "'linux-arm-kernel@lists.infradead.org'" Date: Fri, 16 Jan 2015 09:42:23 +0800 Subject: RE: [RFC V6 2/3] arm:add bitrev.h file to support rbit instruction Thread-Topic: [RFC V6 2/3] arm:add bitrev.h file to support rbit instruction Thread-Index: AdAwGH+GkFWyCyF6SCq88Q1ePFZX1QBFSNzw Message-ID: <35FD53F367049845BC99AC72306C23D103EDAF89E1B0@CNBJMBX05.corpusers.net> References: <35FD53F367049845BC99AC72306C23D103E010D18273@CNBJMBX05.corpusers.net> <35FD53F367049845BC99AC72306C23D103E010D18275@CNBJMBX05.corpusers.net> <20141113235322.GC4042@n2100.arm.linux.org.uk> <35FD53F367049845BC99AC72306C23D103E010D1829B@CNBJMBX05.corpusers.net> <20141114095812.GG4042@n2100.arm.linux.org.uk> <35FD53F367049845BC99AC72306C23D103E688B313C6@CNBJMBX05.corpusers.net> <20150108184059.GZ12302@n2100.arm.linux.org.uk> <35FD53F367049845BC99AC72306C23D103EDAF89E195@CNBJMBX05.corpusers.net> <20150109111048.GE12302@n2100.arm.linux.org.uk> <35FD53F367049845BC99AC72306C23D103EDAF89E198@CNBJMBX05.corpusers.net> <20150114163800.GZ12302@n2100.arm.linux.org.uk> In-Reply-To: <20150114163800.GZ12302@n2100.arm.linux.org.uk> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by nfs id t0G1l9KO019220 > -----Original Message----- > From: Russell King - ARM Linux [mailto:linux@arm.linux.org.uk] > Sent: Thursday, January 15, 2015 12:38 AM > To: Wang, Yalin > Cc: 'Ard Biesheuvel'; 'Will Deacon'; 'linux-kernel@vger.kernel.org'; > 'akinobu.mita@gmail.com'; 'linux-mm@kvack.org'; 'Joe Perches'; 'linux-arm- > kernel@lists.infradead.org' > Subject: Re: [RFC V6 2/3] arm:add bitrev.h file to support rbit instruction > > On Fri, Jan 09, 2015 at 08:40:56PM +0800, Wang, Yalin wrote: > > Oh, I see, > > How about change like this: > > + select HAVE_ARCH_BITREVERSE if ((CPU_V7M || CPU_V7) && !CPU_V6 && > > +!CPU_V6K) > > I am not sure if I also need add some older CPU types like !CPU_ARM9TDMI > &&　!CPU_ARM940T ? > > > > Another solution is: > > + select HAVE_ARCH_BITREVERSE if ((CPU_32V7M || CPU_32V7) && !CPU_32V6 > > +&& !CPU_32V5 && !CPU_32V4 && !CPU_32V4T && !CPU_32V3) > > > > By the way, I am not clear about the difference between CPU_V6 and > > CPU_V6K, could you tell me? :) > > I think > > select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6 > > is sufficient - we don't support mixing pre-v6 and v6+ CPU architectures > into a single kernel. > Ok, I will re-send a patch. Thanks {.n++%ݶw{.n+{G{ayʇڙ,jfhz_(階ݢj"mG?&~iOzv^m ?I