linux-kernel - Re: [PATCH] ubi: kill homegrown endian macros

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Message-Id: <20070517111838.842a29ca.akpm@linux-foundation.org>
Date:	Thu, 17 May 2007 11:18:38 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	dedekind@...radead.org
Cc:	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] ubi: kill homegrown endian macros

On Thu, 17 May 2007 20:46:46 +0300
Artem Bityutskiy <dedekind@...radead.org> wrote:

> On Thu, 2007-05-17 at 10:29 -0700, Andrew Morton wrote:
> > umm..  I'd say what you've done in there is an improvement to the exiting
> > stuff: getting gcc to check it is better than having to use sparse.
> > 
> > I'd have expected gcc to generate poorer code with your approach but I'm
> > showing zero text size changes from Christoph's patch (gcc-4.1 and
> > gcc-3.4.5).
> > 
> > So I wouldn't be averse to creating a new, generic, kernel-wide alternative
> > to the existing __be32/__le32/etc code.  It is an improvement.
> > 
> > We could conceivably simply switch the existing stuff to use structs, but
> > quite a lot of code assumes that cpu_to_foo32(0) == 0 and just does
> > open-coded assigments of zero.  They'd need fixups.
> 
> Andrew,
> 
> thanks for answer. I personally do not think this should be applied
> before we have better __be32 and friends. Thus, if I can do so, I will
> just sit and wait for your decision - whether you include this patch to
> -mm or not :-) .
> 

Drat, and here was I hoping I'd lured you into implementing the generic
code.

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