Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934314AbcKVXfl convert rfc822-to-8bit (ORCPT ); Tue, 22 Nov 2016 18:35:41 -0500 Received: from ozlabs.org ([103.22.144.67]:41157 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933363AbcKVXfj (ORCPT ); Tue, 22 Nov 2016 18:35:39 -0500 Message-ID: <1479857716.6542.60.camel@neuling.org> Subject: Re: [PATCH] powernv: Clear SPRN_PSSCR when a POWER9 CPU comes online From: Michael Neuling To: Michael Ellerman , "Gautham R. Shenoy" , Benjamin Herrenschmidt , Paul Mackerras , Vaidyanathan Srinivasan , "Shreyas B. Prabhu" Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Date: Wed, 23 Nov 2016 10:35:16 +1100 In-Reply-To: <87bmx7um7s.fsf@concordia.ellerman.id.au> References: <1479838000-380-1-git-send-email-ego@linux.vnet.ibm.com> <87bmx7um7s.fsf@concordia.ellerman.id.au> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT X-Mailer: Evolution 3.22.1-0ubuntu2 Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 513 Lines: 16 On Wed, 2016-11-23 at 10:30 +1100, Michael Ellerman wrote: > "Gautham R. Shenoy" writes: > > > From: "Gautham R. Shenoy" > > > > Ensure that PSSCR is set to a safe value corresponding to no > > state-loss each time a POWER9 CPU comes online. > > Is this a bug fix? I can't tell from the change log. There are no known bugs it's fixing.   It's just safer to run with a known default value, rather than what we randomly inherit from previous firmware. Mikey