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

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Date:	Wed, 13 Sep 2006 12:42:51 -0400
From:	Dave Jones <davej@...hat.com>
To:	Jarek Poplawski <jarkao2@...pl>
Cc:	linux-kernel@...r.kernel.org, ak@...e.de
Subject: Re: [PATCH] mpparse.c:231: warning: comparison is always false

On Wed, Sep 13, 2006 at 08:50:10AM +0200, Jarek Poplawski wrote:
 
 > Probably after 2.6.18-rc6-git1 there is this cc warning: 
 > "arch/i386/kernel/mpparse.c:231: warning: comparison is
 > always false due to limited range of data type".
 > Maybe this patch will be helpful.
 > 
 > diff -Nurp linux-2.6.18-rc6-git4-/arch/i386/kernel/mpparse.c linux-2.6.18-rc6-git4/arch/i386/kernel/mpparse.c
 > --- linux-2.6.18-rc6-git4-/arch/i386/kernel/mpparse.c	2006-09-13 00:01:00.000000000 +0200
 > +++ linux-2.6.18-rc6-git4/arch/i386/kernel/mpparse.c	2006-09-13 00:01:00.000000000 +0200
 > @@ -228,12 +228,14 @@ static void __init MP_bus_info (struct m
 >  
 >  	mpc_oem_bus_info(m, str, translation_table[mpc_record]);
 >  
 > +#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
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