From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH 1/3] perf, core: Introduce attrs to count in either
 host or guest mode
Date: Tue, 10 May 2011 16:45:46 +0200
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Cc: Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@elte.hu>,
	Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org
To: Joerg Roedel <joerg.roedel@amd.com>
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On Tue, 2011-05-10 at 16:35 +0200, Joerg Roedel wrote:
> +       /* Can't exclude counting in guest and in host mode */
> +       if (attr.exclude_host && attr.exclude_guest)
> +               return -EINVAL;

Why not?