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

From: Wang, Yalin
Date: Sun Nov 16 2014 - 21:39:13 EST

> From: Russell King - ARM Linux [mailto:linux@xxxxxxxxxxxxxxxx]
> Sent: Friday, November 14, 2014 5:58 PM
> To: Wang, Yalin
> Cc: 'Will Deacon'; 'Ard Biesheuvel'; '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
> > 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 .


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at