From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3xwvdc07vBzDqF3 for ; Tue, 19 Sep 2017 04:28:18 +1000 (AEST) Received: from pps.filterd (m0098394.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v8IIQREm043187 for ; Mon, 18 Sep 2017 14:28:16 -0400 Received: from e18.ny.us.ibm.com (e18.ny.us.ibm.com [129.33.205.208]) by mx0a-001b2d01.pphosted.com with ESMTP id 2d2gdt3r6r-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 18 Sep 2017 14:28:16 -0400 Received: from localhost by e18.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 18 Sep 2017 14:28:15 -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 Date: Mon, 18 Sep 2017 13:28:11 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Message-Id: <49626c85-d466-3f99-bde8-f459e278f6ee@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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