Received: by 2002:ad5:474a:0:0:0:0:0 with SMTP id i10csp4322632imu; Mon, 14 Jan 2019 20:30:00 -0800 (PST) X-Google-Smtp-Source: ALg8bN6fDgr2XbeojXAptJpH/cxA5KsRBWFMkWehDiTpzonRRdiP/thBoekYim3bnGB7s6jTwsxy X-Received: by 2002:a17:902:4523:: with SMTP id m32mr2097771pld.53.1547526600269; Mon, 14 Jan 2019 20:30:00 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1547526600; cv=none; d=google.com; s=arc-20160816; b=DnppmAmxic9NUK2GbUSe0QqHd53F26ch2jN2BQelvFlWOyjRTNOHt8WJ1Jmj5eBJph 0s68cBZdzh2Krb4ki8RZKfQ1m2NbS+tzl7YZ/H06raYhNL/pqL83NWiVyjFLMkMgTwLW 9SndCHLTST/057Bw6KmdTK6jlm9+FAh/PHoS4n0jo8TlAq1creAmXgc8SODXtEfcS5c4 hfFxVe65eCRS6wushf4+gANZMM6ZB6H98w+vHOwEbYT/gYmvfunI4tbFFIyRzRSQhfJs LSN7l5aDPjBDoMJKF68gv+b1f1seG3kKaDq6eslA0uK+NGfEBN/zwjo7pBRMx/4AhfIP aXlw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :references:in-reply-to:message-id:subject:cc:to:from:date; bh=+ulK3a1w9m6mOcJrYgUUiozWEW5MnrDhWGk4mHRV4L8=; b=hQ5hXMGvbcTW09EknfxYhpRnsN+b5D89VMzht848t1+bdKYSA7c6liYb5haQ1+nXr/ MIRsrbzjypcReQvyrVw+k/LgXuQESO9Jb9k2HSgc1UV0GlYPg4RTeAgHOHfQrcqfA+MH YylteYrZqnAZZ8DjN5aQs6YMjDQYFBHt9tmg2nk56G7QITxxrCfTW4obPsyUuxWUHnNv nDq4xMu5jByVe+m5BS1BEK4A16ebNelVsLCmQ7oo9hyeLIQtjvJwp32Xl75JY7wmkvt6 UD8jR4TiZ5Y+5m5xRKGDfvKgPYCOZ/9aGns32/AtvqbVmrZmPZAK8/nUserAJchuiaMM gBkA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id w5si2088791plp.208.2019.01.14.20.29.45; Mon, 14 Jan 2019 20:30:00 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727297AbfAOEZ6 (ORCPT + 99 others); Mon, 14 Jan 2019 23:25:58 -0500 Received: from mail.kernel.org ([198.145.29.99]:34050 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726976AbfAOEZ6 (ORCPT ); Mon, 14 Jan 2019 23:25:58 -0500 Received: from vmware.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BAB6E20656; Tue, 15 Jan 2019 04:25:56 +0000 (UTC) Date: Mon, 14 Jan 2019 23:25:55 -0500 From: Steven Rostedt To: Ming Lei Cc: Jens Axboe , LKML , Linus Torvalds , Andrew Morton , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Clark Williams , Bart Van Assche Subject: Re: Real deadlock being suppressed in sbitmap Message-ID: <20190114232555.5b3b8a33@vmware.local.home> In-Reply-To: <20190115041426.GA13505@ming.t460p> References: <20190114121414.450ab4ea@gandalf.local.home> <20190115032355.GE10121@ming.t460p> <20190114225017.336c2347@vmware.local.home> <20190115041426.GA13505@ming.t460p> X-Mailer: Claws Mail 3.15.1 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 15 Jan 2019 12:14:27 +0800 Ming Lei wrote: > As I mentioned, it should be fine given it is triggered only after one word > is run out of. > > Follows the lockdep warning on the latest linus tree: Thanks for following up on this. Yes, this requires the irqsave then. -- Steve