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=-3.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 1A8D3C433E6 for ; Fri, 28 Aug 2020 15:20:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E609E20757 for ; Fri, 28 Aug 2020 15:20:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="nacZRdte" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728197AbgH1PUM (ORCPT ); Fri, 28 Aug 2020 11:20:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35574 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726321AbgH1PUJ (ORCPT ); Fri, 28 Aug 2020 11:20:09 -0400 Received: from mail-qk1-x744.google.com (mail-qk1-x744.google.com [IPv6:2607:f8b0:4864:20::744]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B3C8AC06121B for ; Fri, 28 Aug 2020 08:20:08 -0700 (PDT) Received: by mail-qk1-x744.google.com with SMTP id p4so1270415qkf.0 for ; Fri, 28 Aug 2020 08:20:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=hmAVQxaLJpSgHlGpdC6W2VwrKbmge9YTpG2rcbgWFRY=; b=nacZRdtevNeYT9CJ6nLA4NoNXEAyPImxNMxzlfmMca1i8stapDOrP+Kxip7McKhAV5 9l08gUo+8TyO6SN7VJAQU4gEAh0vE61+p3F5SrGs1jt0HPdwN0EihHO615GS6tH3XX// A0nOV+WX2a0KXUWY77Rer07c9z3S74bV4v2Bb585J/p8y5I44riACgPdeFN811woipZp TD72hirXsZeWcK+F8I5M2JyC0qJQZ/JdoITLLoxkYgfLPw2wtf7zY5nMI9Zk4ewPdMIL E5GAHWmTEy4YROGgjL9tDeBgbPku0C+eQHKQQ1SjhXL1STugmflpgEmdEcM/svZScCzw LjLg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=hmAVQxaLJpSgHlGpdC6W2VwrKbmge9YTpG2rcbgWFRY=; b=uhEWsqFwhdJF/M3n0u0nORg9Pd7ptYOJT3bVu7D0FmXWVswHguhwAMR67BrxgSNe3i KpyOfGckeaNA+iiLBS3jn43hd3luqQnsZfoC1NL63Uo2Os8vJLb4KDTEYFK9Yab5mtl0 2IllVqOQcN/UO3YFRZlplhLXYmfIDsLoq1typ4cmpi3yhuETmXX1Lmxg5ghVusWu2i0D Bt43oY51la4t7RYhBI/soyudcta4qllsqMmQ7AzGqP2vnXBC9akH3L6mPxeJHaj4EAS+ GHiEHF8H0kxcoT8SwInbunKKcimDg90u2Y0BlroRm93NYTr2HZTy1ibdLlGcT3BM2A+/ GJ0Q== X-Gm-Message-State: AOAM532HuBHfGoK45FKvwumNDF2MPJxxfa7MWp+uZjbyc9uEUHl03ZVZ TKZAa1nlhm7Yh6YG0WpXyJajDA== X-Google-Smtp-Source: ABdhPJzcd9CgTfJl/sRgwevfrnu6z/jWnfmDFGgqlGh6cAgk0HZk1toJqs+TYqzoKCtlM+546U/ncQ== X-Received: by 2002:a05:620a:1185:: with SMTP id b5mr1652758qkk.293.1598628008018; Fri, 28 Aug 2020 08:20:08 -0700 (PDT) Received: from ziepe.ca (hlfxns017vw-156-34-48-30.dhcp-dynamic.fibreop.ns.bellaliant.net. [156.34.48.30]) by smtp.gmail.com with ESMTPSA id v136sm1031904qkb.31.2020.08.28.08.20.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Aug 2020 08:20:07 -0700 (PDT) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1kBgAg-000vxD-HJ; Fri, 28 Aug 2020 12:20:06 -0300 Date: Fri, 28 Aug 2020 12:20:06 -0300 From: Jason Gunthorpe To: Gerald Schaefer Cc: Linus Torvalds , Andrew Morton , linux-mm , LKML , Vasily Gorbik , Alexander Gordeev , linux-s390@vger.kernel.org, Heiko Carstens , Claudio Imbrenda , Christian Borntraeger Subject: Re: [RFC PATCH 0/2] mm/gup: fix gup_fast with dynamic page table folding Message-ID: <20200828152006.GY24045@ziepe.ca> References: <20200828140314.8556-1-gerald.schaefer@linux.ibm.com> <20200828142137.GX24045@ziepe.ca> <20200828170103.6d954d95@thinkpad> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200828170103.6d954d95@thinkpad> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Aug 28, 2020 at 05:01:03PM +0200, Gerald Schaefer wrote: > Just to make sure, you are referring to some future / planned > changes to mm/pagewalk.c, and not some currently existing > pagetable walkers already using the READ_ONCE logic w/o > spinlocks? Yes no current code, just something I've been looking at slowly. Jason