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Commit a22c65f8 authored by Albrecht Dreß's avatar Albrecht Dreß Committed by Grant Likely
Browse files

powerpc: tiny memcpy_(to|from)io optimisation 



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: default avatarAlbrecht Dreß <albrecht.dress@arcor.de>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent 5cc17d7e

arch/powerpc/kernel/io.c

+2 −2
Original line number Diff line number Diff line
@@ -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;