linux-kernel - Re: [PATCH] lzo: fix possible typo in decompresor

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Message-Id: <1207865888.4969.103.camel@dax.rpnet.com>
Date:	Thu, 10 Apr 2008 23:18:08 +0100
From:	Richard Purdie <rpurdie@...ys.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Harvey Harrison <harvey.harrison@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] lzo: fix possible typo in decompresor

On Thu, 2008-04-10 at 13:49 -0700, Linus Torvalds wrote:
> On Thu, 10 Apr 2008, Harvey Harrison wrote:
> >
> > Shift of a le value seems strange, probably meant to shift the cpu-order
> > variable as in the prvious section of the switch statement.
> 
> Hmm. This patch looks ObviouslyCorrect(tm), but it worries me that 
> apparently the old broken code has been around since last July, and afaik 
> it can never have worked on big-endian machines.
> 
> So did nobody ever use it, or why hasn't this ever triggered? How did you 
> find this? A sparse warning?

The heaviest users of the lzo code I know of are little-endian ARM
devices through jffs2. When the code was merged there was a lot of
discussion about the best way to handle the endian issues and unaligned
accesses and whilst I seem to remember someone posting big-endian test
results it could have been before some of the later changes were made.

So yes its possible its not been run on BE until now or that isn't a
common code path. I've checked this against the external LZO library its
based on and the patch is correct

Acked-by: Richard Purdie <rpurdie@...ys.net>

-- 
Richard


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