From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756734AbdIRS2S (ORCPT ); Mon, 18 Sep 2017 14:28:18 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:36670 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751873AbdIRS2R (ORCPT ); Mon, 18 Sep 2017 14:28:17 -0400 To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Cc: Michael Bringmann , Nathan Fontenot , Michael Ellerman , John Allen From: Michael Bringmann Subject: [PATCH 0/2] powerpc/nodes/hotplug: Fix problem with memoryless nodes Organization: IBM Linux Technology Center Date: Mon, 18 Sep 2017 13:28:11 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 17091818-0044-0000-0000-000003919F39 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00007757; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000230; SDB=6.00918904; UDB=6.00461633; IPR=6.00699131; BA=6.00005595; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00017198; XFM=3.00000015; UTC=2017-09-18 18:28:14 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17091818-0045-0000-0000-000007C0A138 Message-Id: <49626c85-d466-3f99-bde8-f459e278f6ee@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-09-18_07:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1707230000 definitions=main-1709180260 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org powerpc/nodes: Ensure enough nodes avail for operations. On systems like PowerPC which allow 'hot-add' of CPU or memory resources, it may occur that the new resources are to be inserted into nodes that were not used for these resources at bootup. In the kernel, any node that is used must be defined and initialized at boot. This patch extracts the value of the lowest domain level (number of allocable resources) from the "rtas" device tree property "ibm,current-associativity-domains" or the device tree property "ibm,max-associativity-domains" to use as the maximum number of nodes to setup as possibly available in the system. powerpc/hotplug: Fix CPU-only node bringup bug On systems like PowerPC which allow 'hot-add' of CPU, it may occur that the new resources are to be inserted into nodes that were not used for memory resources at bootup. Many different configurations of PowerPC resources may need to be supported depending upon the environment. This patch fixes some problems encountered at runtime with configurations that support memory-less nodes, but which allow CPUs to be added at and after boot. Signed-off-by: Michael Bringmann Michael Bringmann (2): powerpc/vphn: Ensure enough nodes avail for operations powerpc/hotplug: Fix CPU-only node bringup bug