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=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, T_DKIMWL_WL_HIGH,USER_AGENT_GIT 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 3912AC004C9 for ; Tue, 7 May 2019 05:38:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F0ACB205ED for ; Tue, 7 May 2019 05:38:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557207500; bh=/QpqgiEvD892eM89UJqtzTQgYRMGKcjohAiPdZLZDMA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=EJSVgu8Z4JIASO1YtDA7tdMIQ3CIbsQ92SL1sAunwBriK8mbCCvjFVxEipFvL7NxB Rsn4K/vJio2ZKwXleUuxrOIxKGiLCrDCiqt9Y1ri4yF9CfpjzpbkN1u0af3WaPHgx6 vIn8Q+UewDuMQKJMytzGQdYPedaNCESrorr7BcL0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728607AbfEGFiT (ORCPT ); Tue, 7 May 2019 01:38:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:58000 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728561AbfEGFiO (ORCPT ); Tue, 7 May 2019 01:38:14 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D7878216C8; Tue, 7 May 2019 05:38:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557207492; bh=/QpqgiEvD892eM89UJqtzTQgYRMGKcjohAiPdZLZDMA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PG6Zu3SWs6DiFuidXIEtnPKLvL/4Ev3p4rfOooLDGmvsOTjYIqaAPezrkiHo2LGhK 9R3NsHAvBfvwbDFKAfvk7VRt/tItKcLtjn1Sa8dEPnxOSyHbo+y5UZI0dP7YXhkiaP pCeHEvtxjxF3aSP305dJtMW08CkLTvWgzPYBoYhI= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Ido Schimmel , Semion Lisyansky , Jiri Pirko , "David S . Miller" , Sasha Levin , netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 75/81] mlxsw: core: Do not use WQ_MEM_RECLAIM for mlxsw ordered workqueue Date: Tue, 7 May 2019 01:35:46 -0400 Message-Id: <20190507053554.30848-75-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190507053554.30848-1-sashal@kernel.org> References: <20190507053554.30848-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ido Schimmel [ Upstream commit 4af0699782e2cc7d0d89db9eb6f8844dd3df82dc ] The ordered workqueue is used to offload various objects such as routes and neighbours in the order they are notified. It should not be called as part of memory reclaim path, so remove the WQ_MEM_RECLAIM flag. This can also result in a warning [1], if a worker tries to flush a non-WQ_MEM_RECLAIM workqueue. [1] [97703.542861] workqueue: WQ_MEM_RECLAIM mlxsw_core_ordered:mlxsw_sp_router_fib6_event_work [mlxsw_spectrum] is flushing !WQ_MEM_RECLAIM events:rht_deferred_worker [97703.542884] WARNING: CPU: 1 PID: 32492 at kernel/workqueue.c:2605 check_flush_dependency+0xb5/0x130 ... [97703.542988] Hardware name: Mellanox Technologies Ltd. MSN3700C/VMOD0008, BIOS 5.11 10/10/2018 [97703.543049] Workqueue: mlxsw_core_ordered mlxsw_sp_router_fib6_event_work [mlxsw_spectrum] [97703.543061] RIP: 0010:check_flush_dependency+0xb5/0x130 ... [97703.543071] RSP: 0018:ffffb3f08137bc00 EFLAGS: 00010086 [97703.543076] RAX: 0000000000000000 RBX: ffff96e07740ae00 RCX: 0000000000000000 [97703.543080] RDX: 0000000000000094 RSI: ffffffff82dc1934 RDI: 0000000000000046 [97703.543084] RBP: ffffb3f08137bc20 R08: ffffffff82dc18a0 R09: 00000000000225c0 [97703.543087] R10: 0000000000000000 R11: 0000000000007eec R12: ffffffff816e4ee0 [97703.543091] R13: ffff96e06f6a5c00 R14: ffff96e077ba7700 R15: ffffffff812ab0c0 [97703.543097] FS: 0000000000000000(0000) GS:ffff96e077a80000(0000) knlGS:0000000000000000 [97703.543101] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [97703.543104] CR2: 00007f8cd135b280 CR3: 00000001e860e003 CR4: 00000000003606e0 [97703.543109] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [97703.543112] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [97703.543115] Call Trace: [97703.543129] __flush_work+0xbd/0x1e0 [97703.543137] ? __cancel_work_timer+0x136/0x1b0 [97703.543145] ? pwq_dec_nr_in_flight+0x49/0xa0 [97703.543154] __cancel_work_timer+0x136/0x1b0 [97703.543175] ? mlxsw_reg_trans_bulk_wait+0x145/0x400 [mlxsw_core] [97703.543184] cancel_work_sync+0x10/0x20 [97703.543191] rhashtable_free_and_destroy+0x23/0x140 [97703.543198] rhashtable_destroy+0xd/0x10 [97703.543254] mlxsw_sp_fib_destroy+0xb1/0xf0 [mlxsw_spectrum] [97703.543310] mlxsw_sp_vr_put+0xa8/0xc0 [mlxsw_spectrum] [97703.543364] mlxsw_sp_fib_node_put+0xbf/0x140 [mlxsw_spectrum] [97703.543418] ? mlxsw_sp_fib6_entry_destroy+0xe8/0x110 [mlxsw_spectrum] [97703.543475] mlxsw_sp_router_fib6_event_work+0x6cd/0x7f0 [mlxsw_spectrum] [97703.543484] process_one_work+0x1fd/0x400 [97703.543493] worker_thread+0x34/0x410 [97703.543500] kthread+0x121/0x140 [97703.543507] ? process_one_work+0x400/0x400 [97703.543512] ? kthread_park+0x90/0x90 [97703.543523] ret_from_fork+0x35/0x40 Fixes: a3832b31898f ("mlxsw: core: Create an ordered workqueue for FIB offload") Signed-off-by: Ido Schimmel Reported-by: Semion Lisyansky Acked-by: Jiri Pirko Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/mellanox/mlxsw/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c index 426aea8ad72c..7482db0767af 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/core.c +++ b/drivers/net/ethernet/mellanox/mlxsw/core.c @@ -1878,7 +1878,7 @@ static int __init mlxsw_core_module_init(void) mlxsw_wq = alloc_workqueue(mlxsw_core_driver_name, WQ_MEM_RECLAIM, 0); if (!mlxsw_wq) return -ENOMEM; - mlxsw_owq = alloc_ordered_workqueue("%s_ordered", WQ_MEM_RECLAIM, + mlxsw_owq = alloc_ordered_workqueue("%s_ordered", 0, mlxsw_core_driver_name); if (!mlxsw_owq) { err = -ENOMEM; -- 2.20.1