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

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Date:	Mon, 17 Nov 2014 10:38:58 +0800
From:	"Wang, Yalin" <Yalin.Wang@...ymobile.com>
To:	'Russell King - ARM Linux' <linux@....linux.org.uk>
CC:	'Will Deacon' <will.deacon@....com>,
	'Ard Biesheuvel' <ard.biesheuvel@...aro.org>,
	"'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

> From: Russell King - ARM Linux [mailto:linux@....linux.org.uk]
> Sent: Friday, November 14, 2014 5:58 PM
> To: Wang, Yalin
> Cc: 'Will Deacon'; 'Ard Biesheuvel'; '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
>
> > Is it possible to build a kernel that support both CPU_V6 and CPU_V7?
> 
> Absolutely it is.
> 
> > I mean in Kconfig, CPU_V6 = y and CPU_V7 = y ?
> 
> Yes.
> 
> > If there is problem like you said,
> > How about this solution:
> > select HAVE_ARCH_BITREVERSE if ((CPU_V7M || CPU_V7) && !CPU_V6)
> 
> That would work.
> 
OK, I will submit a patch for this change.

> > For this patch,
> > I just cherry-pick from Joe,
> > If you are not responsible for this part, I will submit to the
> > maintainers for these patches .
> > Sorry for that .
> 
> I think you need to discuss with Joe how Joe would like his patches handled.
> However, it seems that Joe already sent his patches to the appropriate
> maintainers, and they have been applying those patches themselves.
> 
> Since your generic ARM changes depend on these patches being accepted first,
> this means is that I can't apply the generic ARM changes until those other
> patches have hit mainline, otherwise things are going to break.  So, when
> you come to submit the latest set of patches to the patch system, please do
> so only after these dependent patches have been merged into mainline so
> that they don't get accidentally applied before hand and break the two
> drivers that Joe mentioned.

Joe has submitted patches to maintainers,
So we need wait for them to be accepted .

Thanks

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