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

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Date:	Thu, 14 Sep 2006 07:36:47 +0200
From:	Jarek Poplawski <jarkao2@...pl>
To:	Dave Jones <davej@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mpparse.c:231: warning: comparison is always false

On Wed, Sep 13, 2006 at 12:42:51PM -0400, Dave Jones wrote:
> On Wed, Sep 13, 2006 at 08:50:10AM +0200, Jarek Poplawski wrote:
...  
>  > +#if 0xFF >= MAX_MP_BUSSES
>  >  	if (m->mpc_busid >= MAX_MP_BUSSES) {
>  >  		printk(KERN_WARNING "MP table busid value (%d) for bustype %s "
>  >  			" is too large, max. supported is %d\n",
>  >  			m->mpc_busid, str, MAX_MP_BUSSES - 1);
>  >  		return;
>  >  	}
>  > +#endif
> 
> mpc_busid is a uchar. I don't see how this can ever be > 0xff, yet
> mach-summit and mach-generic have MAX_MP_BUSSES set to 260.
> 
> I don't see how this can possibly work.
> 
> 	Dave
> 

0xFF >= 260 is false so the block is not compiled and
the warning is gone (+ several bytes of useless code).

Jarek P.
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