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_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT 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 76CF6C43219 for ; Wed, 1 May 2019 19:25:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 498F620652 for ; Wed, 1 May 2019 19:25:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="pw2dYNwg" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726124AbfEATZd (ORCPT ); Wed, 1 May 2019 15:25:33 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:40668 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726114AbfEATZc (ORCPT ); Wed, 1 May 2019 15:25:32 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=Svp6NeVfnrKdCuBqYXud25fjj+cIG4+GuETWruPIq3w=; b=pw2dYNwgUYrBZ6XHj0W3NTTJh Q3RgzJjrP6wa+KnPIDx0gBRUtxfV1qjJDBHv7iVnho+f3wuYGz83G6fr7TO7HoAEMYTHg5QGgYoXP OzzYj5HcC9hWpbasGeMbjIaou0uSC4+2igQD8Cber4gU76av4C4orUuxpG7Kx9uJi1hZp7DKoj+6Z NnpRZ59p5v7SBgAqWyhoWvjQYqpvmt3PUPyq/VGataEGxQTUcBoWI4XwoVtzt+tAPiIrjFlzs2HUh QrEzWmwC9loKdoUymC5ugHYthZKD9vyR+brdjLGCwxK+hxu7RsNMcDVvAAmectFYEOAap1oTZM48F 4lfHD8O/w==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=worktop.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1hLur9-0004a4-Se; Wed, 01 May 2019 19:25:28 +0000 Received: by worktop.programming.kicks-ass.net (Postfix, from userid 1000) id E4CC2984EB4; Wed, 1 May 2019 21:25:25 +0200 (CEST) Date: Wed, 1 May 2019 21:25:25 +0200 From: Peter Zijlstra To: Davidlohr Bueso Cc: Waiman Long , Sebastian Andrzej Siewior , linux-rt-users , LKML , Thomas Gleixner , Daniel Bristot de Oliveira , Clark Williams , Juri Lelli , Oleg Nesterov , jack@suse.com Subject: Re: [RT WARNING] DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) != current) with fsfreeze (4.19.25-rt16) Message-ID: <20190501192525.GW7905@worktop.programming.kicks-ass.net> References: <20190326093421.GA29508@localhost.localdomain> <20190419085627.GI4742@localhost.localdomain> <20190430125130.uw7mhdnsoqr2v3gf@linutronix.de> <20190430132811.GB2589@hirez.programming.kicks-ass.net> <20190501170953.GB2650@hirez.programming.kicks-ass.net> <20190501185400.GQ7905@worktop.programming.kicks-ass.net> <20190501192234.rwwuntngpi5v4unq@linux-r8p5> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190501192234.rwwuntngpi5v4unq@linux-r8p5> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-rt-users-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org On Wed, May 01, 2019 at 12:22:34PM -0700, Davidlohr Bueso wrote: > On Wed, 01 May 2019, Peter Zijlstra wrote: > > > Nah, the percpu_rwsem abuse by the freezer is atrocious, we really > > should not encourage that. Also, it completely wrecks -RT. > > > > Hence the proposed patch. > > Is this patch (and removing rcuwait) only intended for rt? Seeing how we want to have -rt upstream, and how horrible that current fixup is; I'm tempted to say that barring a better solution, we'd want this upstream.