linux-kernel - Re: [patch 07/13] Initialize per cpu lowcores on cpu hotplug.

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Message-ID: <20080220102430.GB12635@osiris.boeblingen.de.ibm.com>
Date:	Wed, 20 Feb 2008 11:24:30 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Bastian Blank <bastian@...di.eu.org>,
	Segher Boessenkool <segher@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [patch 07/13] Initialize per cpu lowcores on cpu hotplug.

On Wed, Feb 20, 2008 at 11:09:33AM +0100, Bastian Blank wrote:
> On Wed, Feb 20, 2008 at 10:45:52AM +0100, Heiko Carstens wrote:
> > -	copy_page(lowcore, &S390_lowcore);
> > +	memcpy(lowcore, &S390_lowcore, 512);
> 
> Okay
> 
> >  	memset((void *)lowcore + 512, 0, sizeof(*lowcore) - 512);
> 
> Not completely okay. void pointer are not allowed in arithmetic. gcc
> handles void * as char * in this case, but I think it should usualy be
> avoided.

There are many places all over the kernel that assume sizeof(void) == 1.
That's yet another gcc extension we use... but I'm going to change that
to a char * cast anyway.

Thanks for commenting!
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