linux-kernel - Re: [RFC] arm: use built-in byte swap function

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Message-ID: <20130131064435.GB4926@pd.tnic>
Date:	Thu, 31 Jan 2013 07:44:35 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Kim Phillips <kim.phillips@...escale.com>
Cc:	"Woodhouse, David" <david.woodhouse@...el.com>,
	Russell King <linux@....linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Santos <daniel.santos@...ox.com>,
	David Rientjes <rientjes@...gle.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robherring2@...il.com>
Subject: Re: [RFC] arm: use built-in byte swap function

On Wed, Jan 30, 2013 at 08:09:00PM -0600, Kim Phillips wrote:
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 40e2b12..c8798b9 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -141,6 +141,16 @@ config ARCH_USE_BUILTIN_BSWAP
>  	 instructions should set this. And it shouldn't hurt to set it
>  	 on architectures that don't have such instructions.
>  
> +config ARCH_DEFINES_BUILTIN_BSWAP
> +       depends on ARCH_USE_BUILTIN_BSWAP
> +       bool
> +       help
> +	 ARCH selects this when it wants to control HAVE_BUILTIN_BSWAPxx

This is what threw me off: if ARCH selects this, I don't think we want
to have a help text and the option be user visible? Normally such
options are only bool and are selected automatically by hm.. ARCH, as
you say above and do so below. :-)

> +	 definitions over those in the generic compiler headers.  It
> +	 can be dependent on a combination of byte swapping instruction
> +	 availability, the instruction set version, and the state
> +	 of support in different compiler versions.
> +
>  config HAVE_SYSCALL_WRAPPERS
>  	bool
>  
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 73027aa..b5868c2 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -57,6 +57,8 @@ config ARM
>  	select CLONE_BACKWARDS
>  	select OLD_SIGSUSPEND3
>  	select OLD_SIGACTION
> +	select ARCH_USE_BUILTIN_BSWAP
> +	select ARCH_DEFINES_BUILTIN_BSWAP
>  	help

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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