From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756175AbbJUVqk (ORCPT ); Wed, 21 Oct 2015 17:46:40 -0400 Received: from mga09.intel.com ([134.134.136.24]:33869 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750698AbbJUVqj (ORCPT ); Wed, 21 Oct 2015 17:46:39 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,179,1444719600"; d="scan'208";a="585604383" Date: Wed, 21 Oct 2015 14:46:38 -0700 From: Andi Kleen To: Peter Zijlstra Cc: Andi Kleen , linux-kernel@vger.kernel.org, Ingo Molnar Subject: Re: [PATCH 1/3] x86, perf: Use a new PMU ack sequence Message-ID: <20151021214638.GH15102@tassilo.jf.intel.com> References: <1445458568-16956-1-git-send-email-andi@firstfloor.org> <20151021203621.GJ2508@worktop.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20151021203621.GJ2508@worktop.programming.kicks-ass.net> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > > v2: > > Use new ack sequence unconditionally. Remove pmu reset code. > > So this is not something we can easily revert if things go bad. Esp. > since you build on it with the next patches. Ok, and? You want me to go back to the previous patch? That one is easily undoable (just disable the flag for the model) Another alternative would be to fork the PMI handler into a new and an old version, that is switchable. -Andi -- ak@linux.intel.com -- Speaking for myself only