linux-kernel - Re: [patch 14/21] Xen-paravirt: Add XEN config options and disable unsupported config options.

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Date:	Thu, 15 Feb 2007 23:06:11 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dan Hecht <dhecht@...are.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>, Andi Kleen <ak@....de>,
	Chris Wright <chrisw@...s-sol.org>,
	virtualization@...ts.osdl.org, xen-devel@...ts.xensource.com,
	Ian Pratt <ian.pratt@...source.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 14/21] Xen-paravirt: Add XEN config options and disable
 unsupported config options.

On Thu, 15 Feb 2007 22:14:45 -0800 Dan Hecht <dhecht@...are.com> wrote:

> >  config PREEMPT
> >  	bool "Preemptible Kernel (Low-Latency Desktop)"
> > +	depends on !XEN
> >  	help
> >  	  This option reduces the latency of the kernel by making
> >  	  all kernel code (that is not executing in a critical section)
> > 

Oh, so that's why it doesn't break when CONFIG_PREEMPT=y.  In which case
that preempt_disable() I spotted is wrong-and-unneeded.

Why doesn't Xen work with preemption??

> I hate to sound like a broken record, but this really isn't the right 
> way to do this.  If you are going to inhibit config settings when Xen 
> support is compiled, then it should be:
> 
> config XEN
>      depends on !KEXEC && !DOUBLEFAULT && HZ_100 && !PREEMPT
> 

Agree.
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