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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 13248C3A5A6 for ; Mon, 23 Sep 2019 09:07:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D8C53208C2 for ; Mon, 23 Sep 2019 09:07:13 +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="UPuXtBmu" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729727AbfIWJHM (ORCPT ); Mon, 23 Sep 2019 05:07:12 -0400 Received: from merlin.infradead.org ([205.233.59.134]:40864 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726138AbfIWJHM (ORCPT ); Mon, 23 Sep 2019 05:07:12 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.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=AjuKs2CX8YZOaZpDdYn464XH+IGUCzon57YKAFj2bE4=; b=UPuXtBmuKBTIoDbRHzW020qs4 bpZ5pOwRuM2jaAsZQlWMbIlj8LdsZV3W16eWXWMKgscrdPbg9VxZj9lfSgr3qzEVebE1ae7Po2w69 HFoM8xqgsyaWY0VWBmvuZod40xPSovIimc4lL5IunH3JcFlSTZKTSMuRDI5D+CVc8yLQkOe5er/yC 8WLSATSerjr27Q+baLLt0W87woenejlsOszCwGWR9ZpBeLCfJQfNtFvGsTxpPkBoqowZ7sJKzOmAR OOoIrdYcLKissVkbUhJcLPpOeDNGzPynkNPhjDz/6KTWqAQshVSH4C+ZdUoptOTmEA/LOXwuj5qho eCeeA4TeQ==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.2 #3 (Red Hat Linux)) id 1iCKIp-0001hv-1D; Mon, 23 Sep 2019 09:06:39 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id B5BDC3060D5; Mon, 23 Sep 2019 11:05:51 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 772822B1204E2; Mon, 23 Sep 2019 11:06:36 +0200 (CEST) Date: Mon, 23 Sep 2019 11:06:36 +0200 From: Peter Zijlstra To: Mathieu Desnoyers Cc: "Paul E. McKenney" , Ingo Molnar , linux-kernel@vger.kernel.org, Oleg Nesterov , "Eric W. Biederman" , Linus Torvalds , Russell King - ARM Linux admin , Chris Metcalf , Christoph Lameter , Kirill Tkhai , Mike Galbraith , Thomas Gleixner Subject: Re: [RFC PATCH for 5.4 0/7] Membarrier fixes and cleanups Message-ID: <20190923090636.GH2349@hirez.programming.kicks-ass.net> References: <20190919173705.2181-1-mathieu.desnoyers@efficios.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190919173705.2181-1-mathieu.desnoyers@efficios.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Sep 19, 2019 at 01:36:58PM -0400, Mathieu Desnoyers wrote: > Hi, > > Those series of fixes and cleanups are initially motivated by the report > of race in membarrier, which can load p->mm->membarrier_state after mm > has been freed (use-after-free). > The lot looks good to me; what do you want done with them (them being RFC and all) ?