linux-kernel - RE: [RFC V6 2/3] arm:add bitrev.h file to support rbit instruction

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Date:	Fri, 16 Jan 2015 09:42:23 +0800
From:	"Wang, Yalin" <Yalin.Wang@...ymobile.com>
To:	'Russell King - ARM Linux' <linux@....linux.org.uk>
CC:	'Ard Biesheuvel' <ard.biesheuvel@...aro.org>,
	'Will Deacon' <will.deacon@....com>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'akinobu.mita@...il.com'" <akinobu.mita@...il.com>,
	"'linux-mm@...ck.org'" <linux-mm@...ck.org>,
	'Joe Perches' <joe@...ches.com>,
	"'linux-arm-kernel@...ts.infradead.org'" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [RFC V6 2/3] arm:add bitrev.h file to support rbit instruction

> -----Original Message-----
> From: Russell King - ARM Linux [mailto:linux@....linux.org.uk]
> Sent: Thursday, January 15, 2015 12:38 AM
> To: Wang, Yalin
> Cc: 'Ard Biesheuvel'; 'Will Deacon'; 'linux-kernel@...r.kernel.org';
> 'akinobu.mita@...il.com'; 'linux-mm@...ck.org'; 'Joe Perches'; 'linux-arm-
> kernel@...ts.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