From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeremy Fitzhardinge Subject: Re: [patch 14/21] Xen-paravirt: Add XEN config options and disable unsupported config options. Date: Thu, 15 Feb 2007 23:25:01 -0800 Message-ID: <45D55C4D.1060807@goop.org> References: <20070216022449.739760547@goop.org> <20070216022531.570154735@goop.org> <45D54BD5.8010707@vmware.com> <20070215230611.d89e26be.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20070215230611.d89e26be.akpm@linux-foundation.org> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Andrew Morton Cc: xen-devel@lists.xensource.com, Ian Pratt , Dan Hecht , linux-kernel@vger.kernel.org, Chris Wright , Andi Kleen , virtualization@lists.osdl.org, Steven Hand List-Id: virtualization@lists.linuxfoundation.org Andrew Morton wrote: > On Thu, 15 Feb 2007 22:14:45 -0800 Dan Hecht 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