From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756066AbbJ1PqO (ORCPT ); Wed, 28 Oct 2015 11:46:14 -0400 Received: from mailapp01.imgtec.com ([195.59.15.196]:26529 "EHLO mailapp01.imgtec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751985AbbJ1PqN (ORCPT ); Wed, 28 Oct 2015 11:46:13 -0400 Subject: Re: [RFC v2 PATCH 07/14] irq: add a new generic IPI reservation code to irq core To: Thomas Gleixner References: <1444731382-19313-1-git-send-email-qais.yousef@imgtec.com> <1444731382-19313-8-git-send-email-qais.yousef@imgtec.com> <561D1779.7060307@imgtec.com> CC: , , , , , From: Qais Yousef Message-ID: <5630EDC2.10505@imgtec.com> Date: Wed, 28 Oct 2015 15:46:10 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: <561D1779.7060307@imgtec.com> Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [192.168.154.94] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Thomas, On 10/13/2015 03:38 PM, Qais Yousef wrote: > On 10/13/2015 02:37 PM, Thomas Gleixner wrote: >> On Tue, 13 Oct 2015, Qais Yousef wrote: >> >>> + if (domain == NULL) >>> + domain = irq_default_domain; /* need a separate >>> ipi_default_domain? */ >> No tail comments please. >> >> We should neither use irq_default_domain nor have an >> ipi_default_domain. > > OK though I understood that you were OK with using the > irq_default_domain. > > This means that arch code must parse the DT for an IPI domain. I think > I've seen arch code using the root FDT to search for a specific node. > I'll try to do something similar to search for an IPI domain. I'm having an issue here. I made the arch code look for an IPI domain but we have some platforms on MIPS that don't support device tree. I can't find how I can go away with that without using irq_default_domain. Also irq_default_domain is understandably only visible within irqdomain code, so I can't make the arch code fallback to passing irq_default_domain if the platform doesn't support DT. Are you OK with keeping this in irq_reserve_ipi()? Alternatively I could modify irq_find_host(), which I'm using to find the IPI domain, return irq_default_domain() if the passed node is NULL. Or maybe there's a better option I couldn't think of? Thanks, Qais