On Wed, May 27, 2009 at 2:00 PM, Albrecht Dreß<albrecht.dr...@arcor.de> wrote:
> This trivial patch changes memcpy_(to|from)io as to transfer as many 32-bit
> words as possible in 32-bit accesses (in the current solution, the last
> 32-bit word was transferred as 4 byte accesses).
>
> Signed-off-by: Albrecht Dreß <albrecht.dr...@arcor.de>
Acked-by: Grant Likely <grant.lik...@secretlab.ca>
> ---
>
> diff -urpN -X linux-2.6.29.1.orig/Documentation/dontdiff
> linux-2.6.29.1.orig/arch/powerpc/kernel/io.c
> linux-2.6.29.1/arch/powerpc/kernel/io.c
> --- linux-2.6.29.1.orig/arch/powerpc/kernel/io.c 2009-04-02
> 22:55:27.000000000 +0200
> +++ linux-2.6.29.1/arch/powerpc/kernel/io.c 2009-05-27
> 11:36:09.000000000 +0200
> @@ -161,7 +161,7 @@ void _memcpy_fromio(void *dest, const vo
> 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
> vdest++;
> n--;
> }
> - while(n > 4) {
> + while(n >= 4) {
> *((volatile u32 *)vdest) = *((volatile u32 *)src);
> src += 4;
> vdest += 4;
>
> _______________________________________________
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> linuxppc-...@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-dev
>
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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