Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933465AbYAaNj3 (ORCPT ); Thu, 31 Jan 2008 08:39:29 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752724AbYAaNjV (ORCPT ); Thu, 31 Jan 2008 08:39:21 -0500 Received: from host36-195-149-62.serverdedicati.aruba.it ([62.149.195.36]:39881 "EHLO mx.cpushare.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752560AbYAaNjU (ORCPT ); Thu, 31 Jan 2008 08:39:20 -0500 Date: Thu, 31 Jan 2008 14:39:12 +0100 From: Andrea Arcangeli To: Christoph Lameter Cc: Nick Piggin , Peter Zijlstra , linux-mm@kvack.org, Benjamin Herrenschmidt , steiner@sgi.com, linux-kernel@vger.kernel.org, Avi Kivity , kvm-devel@lists.sourceforge.net, daniel.blueman@quadrics.com, Robin Holt , Hugh Dickins Subject: Re: [kvm-devel] [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges Message-ID: <20080131133912.GM7185@v2.random> References: <20080130170451.GP7233@v2.random> <20080130173009.GT26420@sgi.com> <20080130182506.GQ7233@v2.random> <20080130235214.GC7185@v2.random> <20080131003434.GE7185@v2.random> <20080131024252.GF7185@v2.random> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 922 Lines: 16 On Wed, Jan 30, 2008 at 06:51:26PM -0800, Christoph Lameter wrote: > True. hlist_del_init ok? That would allow to check the driver that the > mmu_notifier is already linked in using !hlist_unhashed(). Driver then > needs to properly initialize the mmu_notifier list with INIT_HLIST_NODE(). A driver couldn't possibly care about the mmu notifier anymore at that point, we just agreed a moment ago that the list can't change under mmu_notifier_release, and in turn no driver could possibly call mmu_notifier_unregister/register at that point anymore regardless of the outcome of hlist_unhashed and external serialization must let the driver know he's done with the notifiers. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/