From 20c1f641bb80fb272dec959a5caabed92e5a422e Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 23 Jun 2009 21:37:26 +0200
Subject: [PATCH] lib/checksum.c: make do_csum optional
Mike Frysinger suggested that do_csum should be optional
so that an architecture can use the generic checksum code
but still provide an optimized fast-path for the most
critical function.
This can mean an implementation using inline assembly,
or in case of Alpha one using 64-bit arithmetic in C.
Cc: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
lib/checksum.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/lib/checksum.c b/lib/checksum.c
index 886b48db4f288..b08c2d059024d 100644
--- a/lib/checksum.c
+++ b/lib/checksum.c
@@ -37,6 +37,7 @@
#include <asm/byteorder.h>
+#ifndef do_csum
static inline unsigned short from32to16(unsigned int x)
{
/* add up 16-bit and 16-bit for 16+c bit */
@@ -102,6 +103,7 @@ static unsigned int do_csum(const unsigned char *buff, int len)
out:
return result;
}
+#endif
/*
* This is a version of ip_compute_csum() optimized for IP headers,
--
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