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=-2.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 3C26DCA9ECF for ; Thu, 31 Oct 2019 17:39:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0BB0D2087F for ; Thu, 31 Oct 2019 17:39:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=kernel-dk.20150623.gappssmtp.com header.i=@kernel-dk.20150623.gappssmtp.com header.b="kZwL4hpQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729102AbfJaRjC (ORCPT ); Thu, 31 Oct 2019 13:39:02 -0400 Received: from mail-io1-f65.google.com ([209.85.166.65]:46091 "EHLO mail-io1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729021AbfJaRjB (ORCPT ); Thu, 31 Oct 2019 13:39:01 -0400 Received: by mail-io1-f65.google.com with SMTP id c6so7625515ioo.13 for ; Thu, 31 Oct 2019 10:39:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=7F7GIco+RAiSZMoAOBzaWPqe/Yne7EeIQyiFSkYuy08=; b=kZwL4hpQFDm4ME4xJiTcQIBTQqxEm5gDHWg/YHRNl2bxzsSfD3T+MHbO4F6W+iuqkv QFB8h1HUUSCcX1ZiM4TmvzUHDhF7XpjrAce9ZC5+/XNMmVVZ+gaMUC8CJyzi5eOfmbCL Y3XIPkt4OIEGuVaE32wwhSE3WSDWbdwuQIcyRLOeDQtTlp7p5FzjwxzMT/sJC1tGNT5d xCtv2tRMswgarBhova/acEgnl3pivcx/8EBxpmvGsH9AnprrF62PyyRbMkhTYzh5SMSZ dJCe0dzCvLp12a9j1g7leZEnJKyFJXHR9wLcuitgnC+qYcCTNinmOXEl1n5+HwYJcPUZ Nq1Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=7F7GIco+RAiSZMoAOBzaWPqe/Yne7EeIQyiFSkYuy08=; b=a65+dpcA6nBxeE107F9RHn5oIev12pZeSHobwq32OlvOI+e3UKA9M0JiR/524mHADv w9x/fnQkJsi0dyK9z6ZSJGBSc34c1BV+xOtxO1xzAhaysoMpzjdYSIAWDLTmjDOjBb2a EDJMxbv1T57azDW+ITTE/vF5wvyXpuBbiSqyfyKPSLbFVBiSeCK0C7JhJFoRZ8w/vW2u eFrVDXRnXxw0l8S40ryadSagQFIgUoo8JSdloRDzC+klUblwfQDPpdpqsUoZktbfvbC7 rGtRjfCffkPCwWV4HgqZVHX8EZ8YWuP5PTeqfmOr0JsdFvGyNUimhubUTOwaQXdCKJp1 mkHQ== X-Gm-Message-State: APjAAAWISI4vHBeurWNNVyCYnAU5PvKtC84+sOzLdBv2BycXqqAmQarz yinYbfjjFcVPwBOrxPOWJ80tNg== X-Google-Smtp-Source: APXvYqwnYzdGAm/xmPNC+zRrjWOT2IM9/nE8WqYcwOX7iRZc4ALvVWc8R9BiUDk1PMQO65jYHe/NRw== X-Received: by 2002:a6b:fa08:: with SMTP id p8mr6279327ioh.84.1572543540403; Thu, 31 Oct 2019 10:39:00 -0700 (PDT) Received: from [192.168.1.159] ([65.144.74.34]) by smtp.gmail.com with ESMTPSA id k7sm389299ioq.50.2019.10.31.10.38.59 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 31 Oct 2019 10:38:59 -0700 (PDT) Subject: Re: [PATCH] iocost: don't nest spin_lock_irq in ioc_weight_write() To: Dan Carpenter , Tejun Heo Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org References: <20191031105341.GA26612@mwanda> From: Jens Axboe Message-ID: <5507a74c-35e6-177c-d9b1-91ebc3120ea2@kernel.dk> Date: Thu, 31 Oct 2019 11:38:58 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20191031105341.GA26612@mwanda> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/31/19 4:53 AM, Dan Carpenter wrote: > This code causes a static analysis warning: > > block/blk-iocost.c:2113 ioc_weight_write() error: double lock 'irq' > > We disable IRQs in blkg_conf_prep() and re-enable them in > blkg_conf_finish(). IRQ disable/enable should not be nested because > that means the IRQs will be enabled at the first unlock instead of the > second one. Applied for 5.3, thanks. -- Jens Axboe