From a22c65f81ae28656b80d2acc687cf6318eb15bba Mon Sep 17 00:00:00 2001 From: =?utf8?q?Albrecht=20Dre=C3=9F?= Date: Wed, 4 Nov 2009 16:43:12 -0700 Subject: [PATCH] powerpc: tiny memcpy_(to|from)io optimisation MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Grant Likely --- arch/powerpc/kernel/io.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kernel/io.c b/arch/powerpc/kernel/io.c index 1882bf419fa6..8dc7547c2377 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; -- 2.20.1