linux-kernel - RE: [RFC V6 2/3] add CONFIG_HAVE_ARCH_BITREVERSE to support rbit instruction

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Message-ID: <35FD53F367049845BC99AC72306C23D103E010D1827D@CNBJMBX05.corpusers.net>
Date:	Fri, 31 Oct 2014 15:54:16 +0800
From:	"Wang, Yalin" <Yalin.Wang@...ymobile.com>
To:	'Will Deacon' <will.deacon@....com>,
	'Ard Biesheuvel' <ard.biesheuvel@...aro.org>
CC:	'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 2/3] add CONFIG_HAVE_ARCH_BITREVERSE to support rbit
 instruction

> From: Wang, Yalin
> Subject: [RFC V6 2/3] add CONFIG_HAVE_ARCH_BITREVERSE to support rbit
> instruction
> 
> 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/arm/Kconfig              |  1 +
>  arch/arm/include/asm/bitrev.h | 21 +++++++++++++++++++++
>  2 files changed, 22 insertions(+)
>  create mode 100644 arch/arm/include/asm/bitrev.h
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 89c4b5c..be92b3b
> 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -28,6 +28,7 @@ config ARM
>  	select HANDLE_DOMAIN_IRQ
>  	select HARDIRQS_SW_RESEND
>  	select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
> +	select HAVE_ARCH_BITREVERSE if (CPU_V7M || CPU_V7)
>  	select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
>  	select HAVE_ARCH_KGDB
>  	select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT) diff --git
> a/arch/arm/include/asm/bitrev.h b/arch/arm/include/asm/bitrev.h new file
> mode 100644 index 0000000..e9b2571
> --- /dev/null
> +++ b/arch/arm/include/asm/bitrev.h
> @@ -0,0 +1,21 @@
> +#ifndef __ASM_ARM_BITREV_H
> +#define __ASM_ARM_BITREV_H
> +
> +static __always_inline __attribute_const__ u32 __arch_bitrev32(u32 x) {
> +	__asm__ ("rbit %0, %1" : "=r" (x) : "r" (x));
> +	return x;
> +}
> +
> +static __always_inline __attribute_const__ u16 __arch_bitrev16(u16 x) {
> +	return __arch_bitrev32((u32)x) >> 16;
> +}
> +
> +static __always_inline __attribute_const__ u8 __arch_bitrev8(u8 x) {
> +	return __arch_bitrev32((u32)x) >> 24;
> +}
> +
> +#endif
> +
> --
> 2.1.1

Wrong title, please ignore this one  ,
I have resend another [RFC V6 2/3] .

Thanks

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