From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lollipop.listbox.com (lollipop.listbox.com [208.210.124.78]) by ozlabs.org (Postfix) with ESMTP id F0CE8DDE43 for ; Wed, 7 Mar 2007 09:21:21 +1100 (EST) Received: from sceptre.pobox.com (sceptre.pobox.com [207.106.133.20]) by lollipop.listbox.com (Postfix) with ESMTP id 18682412DA5 for ; Tue, 6 Mar 2007 17:06:20 -0500 (EST) Date: Tue, 6 Mar 2007 16:05:46 -0600 From: Nathan Lynch To: Mohan Kumar M Subject: Re: [PATCH] Fix interrupt distribution in ppc970 Message-ID: <20070306220546.GI24926@localdomain> References: <20061208045537.GA14626@in.ibm.com> <17798.6928.378248.28903@cargo.ozlabs.ibm.com> <20061218105706.GB3911@in.ibm.com> <20070306135754.GB7476@in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20070306135754.GB7476@in.ibm.com> Cc: ppcdev , Paul Mackerras , fastboot@lists.osdl.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Mohan Kumar M wrote: > Hi, > > Here comes the revised version of patch to fix the interrupt missing > problem when a kdump kernel is booted with "maxcpus=1" kernel parameter. > > In the xics initialization code a check is made to detemine whether > maxcpus kernel parameter is present and if its present then > default_distrib_server variable is initialized to the current boot cpu > id (by default_server variable). So that when ever a kernel is booted > with maxcpus kernel parameter all interrupts are routed to the boot cpu > only. > > Tested on POWER5 and JS20 systems. > > Any comment? Was the root cause of this problem ever determined? It sure looked like a firmware or hardware problem since it's known to occur only on JS20.