linux-kernel - Re: [PATCH 05/17] Blackfin: convert to generic checksum code

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Date:	Fri, 19 Jun 2009 09:12:12 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	Michal Simek <monstr@...str.eu>,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH 05/17] Blackfin: convert to generic checksum code

On Fri, Jun 19, 2009 at 08:33, Arnd Bergmann wrote:
> On Friday 19 June 2009, Mike Frysinger wrote:
>> On Fri, Jun 19, 2009 at 05:05, Arnd Bergmann wrote:
>> > x86 and blackfin are both little-endian, so your variant is correct
>> > there. They add the 0x01 to the low byte of the 16-bit word, while
>> > on big-endian machines, you have to add it to the high byte.
>>
>> can we think of enough simple examples to through together an optional
>> boot-time self test ?
>
> sounds like a good idea.

how about the attached

> lib/checksum.c: Fix another endianess bug

hrm, still not quite :/

the attached test code shows failures in every case
-mike

View attachment "checksum-selftest.c" of type "text/x-csrc" (3194 bytes)