linux-kernel - Re: [PATCH] x86: Add portable getcpu call

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Message-ID: <20060927123959.GC6872@osiris.boeblingen.de.ibm.com>
Date:	Wed, 27 Sep 2006 14:39:59 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Andi Kleen <ak@...e.de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH] x86: Add portable getcpu call

> > So this means that the contents of getcpu_cache will look completely
> > different if a process runs in 32bit mode or 64bit mode. Even if you're
> > saying "user programs should not..." this looks odd to me.
> > Is this really on purpose and do you really think that no user space
> > application will ever rely on the format of getcpu_cache?
> 
> The vsyscalls do, but if anything else does it deserves breaking.
> In the user headers it will also be just a array blob.

Ah, ok. The blob thing is the part I missed then.

> I was considering to xor it with a random value to bring the point across
> more strongly, but then didn't do it. Do you think I should? 

No, I don't think that will help much.
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