Fwd: [PATCH] arch/powerpc: Improve _memcpy

[Albrecht Dreß]

See <http://lists.ozlabs.org/pipermail/linuxppc-dev/2009-May/072582.html>.   
Any chance to get this one into the tree?  Grant?

Cheers, Albrecht.

Am 03.11.09 20:30 schrieb(en) Chris Friesen:
> 
> Forwarding to the ppc mailing list.
> 
> Chris
> 
> 
> -------- Original Message --------
> Subject: [PATCH] arch/powerpc: Improve _memcpy
> Date: Tue,  3 Nov 2009 15:20:56 +0100
> From: Dirk Eibach <eibach at gdsys.de>
> To: linux-kernel at vger.kernel.org
> CC: Dirk Eibach <eibach at gdsys.de>
> 
> The implementation of _memcpy_fromio and _memcpy_toio seems to be
> suboptimal for size 4.
> 
> Signed-off-by: Dirk Eibach <eibach at gdsys.de>
> ---
>  arch/powerpc/kernel/io.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/io.c b/arch/powerpc/kernel/io.c
> index 1882bf4..8dc7547 100644
> --- a/arch/powerpc/kernel/io.c
> +++ b/arch/powerpc/kernel/io.c
> @@ -161,7 +161,7 @@ void _memcpy_fromio(void *dest, const volatile void
> __iomem *src,
>  		dest++;
>  		n--;
>  	}
> -	while(n > 4) {
> +	while(n >= 4) {
>  		*((u32 *)dest) = *((volatile u32 *)vsrc);
>  		eieio();
>  		vsrc += 4;
> @@ -190,7 +190,7 @@ void _memcpy_toio(volatile void __iomem *dest, const
> void *src, unsigned long n)
>  		vdest++;
>  		n--;
>  	}
> -	while(n > 4) {
> +	while(n >= 4) {
>  		*((volatile u32 *)vdest) = *((volatile u32 *)src);
>  		src += 4;
>  		vdest += 4;
> --
> 1.5.6.5
> 
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