Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755738AbeAORkm (ORCPT + 1 other); Mon, 15 Jan 2018 12:40:42 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:41644 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755690AbeAORkk (ORCPT ); Mon, 15 Jan 2018 12:40:40 -0500 Date: Mon, 15 Jan 2018 09:40:36 -0800 From: Christoph Hellwig To: Ming Lei Cc: Jens Axboe , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Christoph Hellwig , Thomas Gleixner , Laurence Oberman , Mike Snitzer Subject: Re: [PATCH 0/2] genirq/affinity: try to make sure online CPU is assgined to irq vector Message-ID: <20180115174036.GA20191@infradead.org> References: <20180115160345.2611-1-ming.lei@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180115160345.2611-1-ming.lei@redhat.com> User-Agent: Mutt/1.9.1 (2017-09-22) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: On Tue, Jan 16, 2018 at 12:03:43AM +0800, Ming Lei wrote: > Hi, > > These two patches fixes IO hang issue reported by Laurence. > > 84676c1f21 ("genirq/affinity: assign vectors to all possible CPUs") > may cause one irq vector assigned to all offline CPUs, then this vector > can't handle irq any more. Well, that very much was the intention of managed interrupts. Why does the device raise an interrupt for a queue that has no online cpu assigned to it?