Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757480Ab3DSQQK (ORCPT ); Fri, 19 Apr 2013 12:16:10 -0400 Received: from smtp.eu.citrix.com ([46.33.159.39]:51525 "EHLO SMTP.EU.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756221Ab3DSQQI (ORCPT ); Fri, 19 Apr 2013 12:16:08 -0400 X-IronPort-AV: E=Sophos;i="4.87,510,1363132800"; d="scan'208";a="3748829" Message-ID: <1366388166.29403.2.camel@dagon.hellion.org.uk> Subject: Re: [Xen-devel] [PATCH v6 1/4] arm: introduce psci_smp_ops From: Ian Campbell To: Nicolas Pitre CC: Stefano Stabellini , "xen-devel@lists.xensource.com" , Russell King - ARM Linux , "arnd@arndb.de" , "marc.zyngier@arm.com" , "will.deacon@arm.com" , "linux-kernel@vger.kernel.org" , "rob.herring@calxeda.com" , "linux-arm-kernel@lists.infradead.org" Date: Fri, 19 Apr 2013 17:16:06 +0100 In-Reply-To: References: <1365167495-18508-1-git-send-email-stefano.stabellini@eu.citrix.com> <20130418161341.GB14496@n2100.arm.linux.org.uk> Organization: Citrix Systems, Inc. Content-Type: text/plain; charset="ISO-8859-1" X-Mailer: Evolution 3.4.4-1 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 707 Lines: 17 On Fri, 2013-04-19 at 16:47 +0100, Nicolas Pitre wrote: > No one should be probing registers without making sure it is safe to do > so. Even on non virtualized hardware this can be a dangerous thing to > do. Won't people writing per machine code consider, not unreasonably, that having been called through a mdesc machine specific hook constitutes enough "making sure" that they think it is safe to touch registers which are specific to that machine? Ian. -- 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/