[PATCH 2/2] ARM: kconfig: select HAVE_EFFICIENT_UNALIGNED_ACCESS for CPUv6+ && MMU

[Will Deacon]

Hi Nicolas,

On Tue, Dec 17, 2013 at 08:34:18PM +0000, Nicolas Pitre wrote:
> On Tue, 17 Dec 2013, Will Deacon wrote:
> 
> > Modern ARM CPUs can perform efficient unaligned memory accesses in
> > hardware and this feature is relied up on by code such as the dcache
> > word-at-a-time name hashing.
> > 
> > This patch selects HAVE_EFFICIENT_UNALIGNED_ACCESS for these cores and
> > reworks the kconfig select logic for DCACHE_WORD_ACCESS to use the new
> > symbol.
> > 
> > Signed-off-by: Will Deacon <will.deacon at arm.com>
> 
> This symbol could be used in some more places too.  For example this 
> would make the code a bit clearer:

Well spotted.

> diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h
> index 72abdc541f..12c3a5decc 100644
> --- a/arch/arm/include/asm/uaccess.h
> +++ b/arch/arm/include/asm/uaccess.h
> @@ -19,7 +19,7 @@
>  #include <asm/unified.h>
>  #include <asm/compiler.h>
>  
> -#if __LINUX_ARM_ARCH__ < 6
> +#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
>  #include <asm-generic/uaccess-unaligned.h>
>  #else
>  #define __get_user_unaligned __get_user

The original patch is now queued, so we can add this hunk as a follow-up
cleanup patch. I've got you as the author, but can I add your S-o-B please?

Cheers,

Will