path: root/lib/checksum.c
diff options
authorArnd Bergmann <>2009-06-23 21:37:26 +0200
committerArnd Bergmann <>2009-11-03 16:06:52 +0100
commit20c1f641bb80fb272dec959a5caabed92e5a422e (patch)
treef86824522190b527c211ae43054e1e0a1f25568d /lib/checksum.c
parentc44ba9f6684946b156335da6a6d55f0b8cf7cb72 (diff)
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 <> Signed-off-by: Arnd Bergmann <>
Diffstat (limited to 'lib/checksum.c')
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/checksum.c b/lib/checksum.c
index 886b48db4f28..b08c2d059024 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)
return result;
* This is a version of ip_compute_csum() optimized for IP headers,