From patchwork Sat May 9 07:22:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amol Grover X-Patchwork-Id: 219571 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=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 5C7A7C47254 for ; Sat, 9 May 2020 07:24:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3BF5224955 for ; Sat, 9 May 2020 07:24:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="KUc+DAyx" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728884AbgEIHYH (ORCPT ); Sat, 9 May 2020 03:24:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36608 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1725822AbgEIHYG (ORCPT ); Sat, 9 May 2020 03:24:06 -0400 Received: from mail-pg1-x544.google.com (mail-pg1-x544.google.com [IPv6:2607:f8b0:4864:20::544]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C174EC061A0C; Sat, 9 May 2020 00:24:06 -0700 (PDT) Received: by mail-pg1-x544.google.com with SMTP id n11so1971073pgl.9; Sat, 09 May 2020 00:24:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=O6NOWgkJuVNBzcRIWQKK+1L2R6ELyCXl3BZEpc2cyyg=; b=KUc+DAyxbo/FIS+4ZMWHTtwo6Scti9M6yahWtKDsNxEMlPDPUR2gzIMoGEdEJszrYh yTljj1+PVG4Fy6LZ9x2kjiHQnC2qaotowIAdSHDX9LBsHeBkobPRtDapevkpz/D47TKt BR+X3l9qhCILE3KscM+h8IXp2Rrug8V+6hjbFY8O9s2D0ROHxnLLLlRDXM0k4X5OqYOX fp1LQgIGNHScNVR9h6q2t0tvkeiAjw61Rm+/vdQhKpluCNGdrDoQjZgJpsopz2L5Zrk/ Ddfxg1DflK9NwFWtiA0KDnOGZIiNN/MBy3m0zx+tYPSMiP7YKzgdy9YSg8UOqo0gdN2L PzZQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=O6NOWgkJuVNBzcRIWQKK+1L2R6ELyCXl3BZEpc2cyyg=; b=lGNzmU4R2IhaVTub2SG/x9EWAEIuRNZR9yLIIYHM/eWBQ665Fh7H2FsT7ugsT4snAw MjQQtqyQiuo+aXQFBJQT53FORfIUXm/sFgMiW7oQLohg+eN+3l77Q12PqhLq2z0LBXz1 0Xr5TZxBrx/ANpa9rdlg8gg+a3KF9UAeLs+hCSAGqTaB6hYFtpEhviPk+cwG6akDGxgG t20gSqcL5dY3vwGYzmJIU+ab/Ia1OdglAATY3gn9q/dXHvnUGEgNPwnbL4dU1v9Zc4SK 24b1FvL8r5KJOkGn+Eemjp0Ojp52zvpHrMEUeUEZzXQ1kmYrdBHkObXuyr3k4BHiknt1 rcXw== X-Gm-Message-State: AGi0PuYzqGo2qvRq0NQIsiAZ5K/HQGVgcAXhlbDHwQswp+YvhkmHjrG5 lYweykLiUBWT2pKtz+0tSAo= X-Google-Smtp-Source: APiQypLTU3XMkvl0Nz44wwzDblB4tt49h2bt3Qv4UGrAIw0pZYdRRFVUWDJLSt6+VdFXVmRMfm3pag== X-Received: by 2002:aa7:9148:: with SMTP id 8mr7084252pfi.154.1589009046017; Sat, 09 May 2020 00:24:06 -0700 (PDT) Received: from localhost.localdomain ([103.87.56.89]) by smtp.googlemail.com with ESMTPSA id f74sm14024249pje.3.2020.05.09.00.24.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 09 May 2020 00:24:05 -0700 (PDT) From: Amol Grover To: "David S . Miller" , Alexey Kuznetsov , Hideaki YOSHIFUJI , Jakub Kicinski Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kernel-mentees@lists.linuxfoundation.org, Joel Fernandes , Madhuparna Bhowmik , "Paul E . McKenney" , Amol Grover Subject: [PATCH net 1/2 RESEND] ipmr: Fix RCU list debugging warning Date: Sat, 9 May 2020 12:52:43 +0530 Message-Id: <20200509072243.3141-1-frextrite@gmail.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org ipmr_for_each_table() macro uses list_for_each_entry_rcu() for traversing outside of an RCU read side critical section but under the protection of rtnl_mutex. Hence, add the corresponding lockdep expression to silence the following false-positive warning at boot: [ 4.319347] ============================= [ 4.319349] WARNING: suspicious RCU usage [ 4.319351] 5.5.4-stable #17 Tainted: G E [ 4.319352] ----------------------------- [ 4.319354] net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!! Signed-off-by: Amol Grover --- net/ipv4/ipmr.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c index 6e68def66822..99c864eb6e34 100644 --- a/net/ipv4/ipmr.c +++ b/net/ipv4/ipmr.c @@ -110,7 +110,8 @@ static void ipmr_expire_process(struct timer_list *t); #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES #define ipmr_for_each_table(mrt, net) \ - list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list) + list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list, \ + lockdep_rtnl_is_held()) static struct mr_table *ipmr_mr_table_iter(struct net *net, struct mr_table *mrt)