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=-3.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 7A108C5517A for ; Thu, 12 Nov 2020 07:55:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 15C8421D40 for ; Thu, 12 Nov 2020 07:55:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="c8kPM04f" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725979AbgKLHzq (ORCPT ); Thu, 12 Nov 2020 02:55:46 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:33998 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725884AbgKLHzq (ORCPT ); Thu, 12 Nov 2020 02:55:46 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1605167745; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=6bz/KsOzR5wf+7A3G0krlSSNDvuKL7/IXddr5pTa7h0=; b=c8kPM04ff2yRpTcJp2A31F6rbGe5o42zwNq/tCVMypnBamq8puMrfTDXPR9Vkx204H5G1V n8Yl6wkQ0fYVsyUL9zSwoyhi1ilzKPB8vaY9hq9SQ52ZMsKGASlDOElogV7kK9dPnaFxmg +E6nzkulsq16HRBTJRSuyVnq7S3vTDc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-332-jjHKepSSNHeZXwrszJvw7A-1; Thu, 12 Nov 2020 02:55:41 -0500 X-MC-Unique: jjHKepSSNHeZXwrszJvw7A-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B9E168018AB; Thu, 12 Nov 2020 07:55:38 +0000 (UTC) Received: from localhost (ovpn-12-132.pek2.redhat.com [10.72.12.132]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8BEDA2CFBB; Thu, 12 Nov 2020 07:55:36 +0000 (UTC) From: Ming Lei To: Jens Axboe , linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, Christoph Hellwig Cc: Ming Lei , Qian Cai , Sumit Saxena , John Garry , Kashyap Desai , Bart Van Assche , Hannes Reinecke Subject: [PATCH 0/3] blk-mq/nvme-loop: use nvme-loop's lock class for addressing lockdep false positive warning Date: Thu, 12 Nov 2020 15:55:23 +0800 Message-Id: <20201112075526.947079-1-ming.lei@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Hi, Qian reported there is hang during booting when shared host tagset is introduced on megaraid sas. Sumit reported the whole SCSI probe takes about ~45min in his test. Turns out it is caused by nr_hw_queues increased, especially commit b3c6a5997541("block: Fix a lockdep complaint triggered by request queue flushing") adds synchronize_rcu() for each hctx's release handler. Address the original lockdep false positive warning by simpler way, then long scsi probe can be avoided with lockdep enabled. Ming Lei (3): blk-mq: add new API of blk_mq_hctx_set_fq_lock_class nvme-loop: use blk_mq_hctx_set_fq_lock_class to set loop's lock class Revert "block: Fix a lockdep complaint triggered by request queue flushing" block/blk-flush.c | 30 +++++++++++++++++++++++++----- block/blk.h | 1 - drivers/nvme/target/loop.c | 10 ++++++++++ include/linux/blk-mq.h | 3 +++ 4 files changed, 38 insertions(+), 6 deletions(-) Cc: Qian Cai Cc: Sumit Saxena Cc: John Garry Cc: Kashyap Desai Cc: Bart Van Assche Cc: Hannes Reinecke -- 2.25.4