> -----Original Message----- > From: Russell King - ARM Linux [mailto:linux@xxxxxxxxxxxxxxxx] > Sent: Thursday, January 15, 2015 12:38 AM > To: Wang, Yalin > Cc: 'Ard Biesheuvel'; 'Will Deacon'; 'linux-kernel@xxxxxxxxxxxxxxx'; > 'akinobu.mita@xxxxxxxxx'; 'linux-mm@xxxxxxxxx'; 'Joe Perches'; 'linux-arm- > kernel@xxxxxxxxxxxxxxxxxxx' > 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������g��� �a��� �&ޖ)���)��h���&������梷���� �Ǟ�m������)������^�����������v���O��zf������