From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 210F2C04ABB for ; Tue, 11 Sep 2018 16:11:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CE9062086E for ; Tue, 11 Sep 2018 16:11:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CE9062086E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727346AbeIKVLo (ORCPT ); Tue, 11 Sep 2018 17:11:44 -0400 Received: from mx2.suse.de ([195.135.220.15]:53614 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726689AbeIKVLo (ORCPT ); Tue, 11 Sep 2018 17:11:44 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay1.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 3144BB04A; Tue, 11 Sep 2018 16:11:43 +0000 (UTC) Date: Tue, 11 Sep 2018 18:11:43 +0200 Message-ID: From: Takashi Iwai To: Jens Axboe Cc: Paolo Valente , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [REGRESSION] bfq probe failed on 4.19-rc3 In-Reply-To: <8b5a7dc9-2dc1-16ee-4b05-a72eb6680c77@kernel.dk> References: <8b5a7dc9-2dc1-16ee-4b05-a72eb6680c77@kernel.dk> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 Emacs/26 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 11 Sep 2018 18:09:44 +0200, Jens Axboe wrote: > > On 9/11/18 10:03 AM, Takashi Iwai wrote: > > Hi, > > > > I noticed that bfq doesn't appear in the I/O scheduler list on > > 4.19-rc3. It seems that blkcg_policy_register() at the beginning of > > bfq_init() returns -ENOSPC, hence the probe aborts silently. > > > > Is this already addressed? > > Haven't heard about this one before. What kernel did you last use that > worked? IIRC, 4.18 worked fine. Let me see whether I have a backup... Takashi