linux-kernel - Re: [PATCH] mpparse.c:231: warning: comparison is always false

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Date:	Fri, 15 Sep 2006 11:08:19 +0200
From:	Jarek Poplawski <jarkao2@...pl>
To:	Andrew Morton <akpm@...l.org>
Cc:	Andi Kleen <ak@....de>, Dave Jones <davej@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mpparse.c:231: warning: comparison is always false

On Fri, Sep 15, 2006 at 01:23:02AM -0700, Andrew Morton wrote:
> On Fri, 15 Sep 2006 10:11:23 +0200
> Jarek Poplawski <jarkao2@...pl> wrote:
> > As a matter of fact today I think my patch is wrong.
... 
> No, I think it's OK.  Well, you had an off-by-one...

just like the source:

 > +#if 0xFF >= MAX_MP_BUSSES
 >  	if (m->mpc_busid >= MAX_MP_BUSSES) {

...
> > but after rethinking
> > the question of Dave Jones I see it's fixing the result
> > instead of the source of a problem (char or not char).
> 
> The mpc_busid field is set to eight-bits by BIOS; there's nothing we can do
> about that...

So IMHO maybe: if we can know this only by BIOS it should be
eight-bits - if there is another way to get this: shouln't
you add second constant? Now it's unlogical for me (and it
induces this strange #ifs in the code instead of headers).

Jarek P.  
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