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

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Message-ID: <45D55C4D.1060807@goop.org>
Date:	Thu, 15 Feb 2007 23:25:01 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Dan Hecht <dhecht@...are.com>, 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,
	Keir Fraser <Keir.Fraser@...cam.ac.uk>,
	Steven Hand <steven.hand@...cam.ac.uk>
Subject: Re: [patch 14/21] Xen-paravirt: Add XEN config options and disable
 unsupported config options.

Andrew Morton wrote:
> 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've forgotten the details.  Ian?  Keir?  Steven?  Maybe it can be done.

    J
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