Subject: Fwd: [PATCH] arch/powerpc: Improve _memcpy

From: "Chris Friesen" <[email-masked]>
Date: Tue, 03 Nov 2009 13:30:14 -0600

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 <[email-masked]>
To: [email-masked]
CC: Dirk Eibach <[email-masked]>

The implementation of _memcpy_fromio and _memcpy_toio seems to be
suboptimal for size 4.

Signed-off-by: Dirk Eibach <[email-masked]>
---
 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