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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 6BB81C5517A for ; Thu, 12 Nov 2020 07:56:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1441A21D40 for ; Thu, 12 Nov 2020 07:56:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="bp3NjkH/" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726219AbgKLH4H (ORCPT ); Thu, 12 Nov 2020 02:56:07 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:28269 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726210AbgKLH4H (ORCPT ); Thu, 12 Nov 2020 02:56:07 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1605167766; 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: in-reply-to:in-reply-to:references:references; bh=tEoa++yckJvX4gcWfT2MBofUbpK3jZSNs2PNG4vNnbQ=; b=bp3NjkH/zGhhUb1wjGej1/tcQa+mIwtByNcVSICjvgQenOD7afIHsxmK2uw116QBe5df1a FvT9s/hteUKI/C/BWVGDRM5Vj6P2Mx6JVSKz1ECQdPqu6zGtUzYxPOKGVJIJjvHktHlynu MgxqQ935yWV4XpIYdgB0R6UrVisXzco= 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-137-Qy0ZrkkNMQmHW1aSSMJYhw-1; Thu, 12 Nov 2020 02:56:01 -0500 X-MC-Unique: Qy0ZrkkNMQmHW1aSSMJYhw-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C87CA425F3; Thu, 12 Nov 2020 07:55:59 +0000 (UTC) Received: from localhost (ovpn-12-132.pek2.redhat.com [10.72.12.132]) by smtp.corp.redhat.com (Postfix) with ESMTP id 294CA5DA74; Thu, 12 Nov 2020 07:55:52 +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 3/3] Revert "block: Fix a lockdep complaint triggered by request queue flushing" Date: Thu, 12 Nov 2020 15:55:26 +0800 Message-Id: <20201112075526.947079-4-ming.lei@redhat.com> In-Reply-To: <20201112075526.947079-1-ming.lei@redhat.com> References: <20201112075526.947079-1-ming.lei@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org This reverts commit b3c6a59975415bde29cfd76ff1ab008edbf614a9. Now we can avoid nvme-loop lockdep warning of 'lockdep possible recursive locking' by nvme-loop's lock class, no need to apply dynamically allocated lock class key, so revert commit b3c6a5997541("block: Fix a lockdep complaint triggered by request queue flushing"). This way fixes horrible SCSI probe delay issue on megaraid_sas, and it is reported the whole probe may take more than half an hour. Reported-by: Qian Cai Cc: Sumit Saxena Cc: John Garry Cc: Kashyap Desai Cc: Bart Van Assche Cc: Hannes Reinecke Signed-off-by: Ming Lei --- block/blk-flush.c | 5 ----- block/blk.h | 1 - 2 files changed, 6 deletions(-) diff --git a/block/blk-flush.c b/block/blk-flush.c index 657743524e15..c64f049226f6 100644 --- a/block/blk-flush.c +++ b/block/blk-flush.c @@ -69,7 +69,6 @@ #include #include #include -#include #include "blk.h" #include "blk-mq.h" @@ -469,9 +468,6 @@ struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size, INIT_LIST_HEAD(&fq->flush_queue[1]); INIT_LIST_HEAD(&fq->flush_data_in_flight); - lockdep_register_key(&fq->key); - lockdep_set_class(&fq->mq_flush_lock, &fq->key); - return fq; fail_rq: @@ -486,7 +482,6 @@ void blk_free_flush_queue(struct blk_flush_queue *fq) if (!fq) return; - lockdep_unregister_key(&fq->key); kfree(fq->flush_rq); kfree(fq); } diff --git a/block/blk.h b/block/blk.h index dfab98465db9..806fd6537295 100644 --- a/block/blk.h +++ b/block/blk.h @@ -25,7 +25,6 @@ struct blk_flush_queue { struct list_head flush_data_in_flight; struct request *flush_rq; - struct lock_class_key key; spinlock_t mq_flush_lock; }; -- 2.25.4