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>
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