linux-kernel - Re: [RFC V6 3/3] arm64:add bitrev.h file to support rbit instruction

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Date:	Fri, 31 Oct 2014 10:43:06 +0000
From:	Will Deacon <will.deacon@....com>
To:	"Wang, Yalin" <Yalin.Wang@...ymobile.com>
Cc:	'Ard Biesheuvel' <ard.biesheuvel@...aro.org>,
	'Russell King - ARM Linux' <linux@....linux.org.uk>,
	"'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 3/3] arm64:add bitrev.h file to support rbit instruction

On Fri, Oct 31, 2014 at 05:41:48AM +0000, Wang, Yalin wrote:
> This patch add bitrev.h file to support rbit instruction,
> so that we can do bitrev operation by hardware.
> Signed-off-by: Yalin Wang <yalin.wang@...ymobile.com>
> ---
>  arch/arm64/Kconfig              |  1 +
>  arch/arm64/include/asm/bitrev.h | 21 +++++++++++++++++++++
>  2 files changed, 22 insertions(+)
>  create mode 100644 arch/arm64/include/asm/bitrev.h
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 9532f8d..b1ec1dd 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -35,6 +35,7 @@ config ARM64
>  	select HANDLE_DOMAIN_IRQ
>  	select HARDIRQS_SW_RESEND
>  	select HAVE_ARCH_AUDITSYSCALL
> +	select HAVE_ARCH_BITREVERSE
>  	select HAVE_ARCH_JUMP_LABEL
>  	select HAVE_ARCH_KGDB
>  	select HAVE_ARCH_TRACEHOOK
> diff --git a/arch/arm64/include/asm/bitrev.h b/arch/arm64/include/asm/bitrev.h
> new file mode 100644
> index 0000000..706a209
> --- /dev/null
> +++ b/arch/arm64/include/asm/bitrev.h
> @@ -0,0 +1,21 @@
> +#ifndef __ASM_ARM64_BITREV_H
> +#define __ASM_ARM64_BITREV_H

Really minor nit, but we don't tend to include 'ARM64' in our header guards,
so this should just be __ASM_BITREV_H.

With that change,

  Acked-by: Will Deacon <will.deacon@....com>

Will
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