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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B57FEC07E9D for ; Tue, 27 Sep 2022 19:07:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231659AbiI0THZ (ORCPT ); Tue, 27 Sep 2022 15:07:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39244 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231167AbiI0THX (ORCPT ); Tue, 27 Sep 2022 15:07:23 -0400 Received: from mail-pg1-x52e.google.com (mail-pg1-x52e.google.com [IPv6:2607:f8b0:4864:20::52e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 19BD41C6A5A for ; Tue, 27 Sep 2022 12:07:22 -0700 (PDT) Received: by mail-pg1-x52e.google.com with SMTP id f193so10279070pgc.0 for ; Tue, 27 Sep 2022 12:07:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date; bh=TganKE5ujEzwcNzLIUtCyIVdPLaa9W7UwC/PPJN5TMg=; b=XKxxvLcIteR4SajvZ6q3lTfxxgv+onl6aCwE3qNraQJKKbQvKUF4KDQh4HHDtDrCqf icsI/UANgZaT5cNb94sUvnNT3tewZDV/vfylWxFZIqsXrSpQwS4OJN5WPWevGYnnTybz TpWFIqeVCTHkSuYQ/26eFfIcmuQECb/XUJqky7GDOSozTOrhPXYfRh8D4iKh+KAocwMd Wb0buyGOgSwY+79UHE4cHqsKPODHfTKHQI1ZWJDvd8eKJ+6tzWjEwwj/LTtuXPywC9pC Fz+b9zLoC36sHJkiZCdccZLJ5sdfk8S+Za2DdudqcuSjrQ892ugDa+2udxz+0/kF2a5x ykrA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date; bh=TganKE5ujEzwcNzLIUtCyIVdPLaa9W7UwC/PPJN5TMg=; b=uUYxu23UaBWUI5+eDU0nyKCE0lIfABAtW++7k684arJRZdcGdll47NsE4THJW4THrm rIAwsBbgdtT1bDPpwwxAiJwa9MWwKj95i7e0hAo4xlJtfvxA98sQYAtBA2YsrAW66i7V nG/u2YH3ovuKMFvse2MlhKiFBwukRWzPeqR6CY731uXBuh7i7wnE/c1kLh+meFyf3tyq jH5j7w5kexXEd9Vy3rO7Ku9xle7nsEtOq99Zfxman0cqzFmZLgk+Tf1k89NnNZaWfjeD xIfMfknLypdfNvM0NHf4vBM+lu7zrZcMaWL+qCgm5U2z9Z0hqhWu30xEdV+jBIFNHDfM qpZQ== X-Gm-Message-State: ACrzQf0MZbY7vp1MgWOcRefTg/TB2F5eeQCrNy5odAEdrbG1CkjE8AYc +bJZvlURc3PTaxSzIwPQZpE= X-Google-Smtp-Source: AMsMyM4nwBTr1WtUt3Z7FqBSlx3z1lIHjrRvu5Pe1cwl55ZGnSpGzfT+VszOE8d7Ny197LF3bCQq9A== X-Received: by 2002:a63:1450:0:b0:439:3806:9b91 with SMTP id 16-20020a631450000000b0043938069b91mr25623673pgu.407.1664305641578; Tue, 27 Sep 2022 12:07:21 -0700 (PDT) Received: from strix-laptop (2001-b011-20e0-1b32-d148-19d6-82fa-6094.dynamic-ip6.hinet.net. [2001:b011:20e0:1b32:d148:19d6:82fa:6094]) by smtp.gmail.com with ESMTPSA id s75-20020a632c4e000000b0042af14719f4sm1900407pgs.51.2022.09.27.12.07.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Sep 2022 12:07:21 -0700 (PDT) Date: Wed, 28 Sep 2022 03:07:13 +0800 From: Chih-En Lin To: Nadav Amit Cc: Andrew Morton , Qi Zheng , David Hildenbrand , Matthew Wilcox , Christophe Leroy , LKML , Linux MM , Luis Chamberlain , Kees Cook , Iurii Zaikin , Vlastimil Babka , William Kucharski , "Kirill A . Shutemov" , Peter Xu , Suren Baghdasaryan , Arnd Bergmann , Tong Tiangen , Pasha Tatashin , Li kunyu , Anshuman Khandual , Minchan Kim , Yang Shi , Song Liu , Miaohe Lin , Thomas Gleixner , Sebastian Andrzej Siewior , Andy Lutomirski , Fenghua Yu , Dinglan Peng , Pedro Fonseca , Jim Huang , Huichun Feng Subject: Re: [RFC PATCH v2 5/9] mm, pgtable: Add a refcount to PTE table Message-ID: References: <20220927162957.270460-1-shiyn.lin@gmail.com> <20220927162957.270460-6-shiyn.lin@gmail.com> <8C7248F0-55E4-4813-9167-C8CD2D02F1D0@vmware.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8C7248F0-55E4-4813-9167-C8CD2D02F1D0@vmware.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Sep 27, 2022 at 05:59:16PM +0000, Nadav Amit wrote: > Is there some assumption that pmd_get_pte() would not be called between the > page_ref_add_unless() and cow_pte_fallback()? > > Hard to know without comments or context. Yes. It is one of the corner case that I need to handle it. Thanks, Chih-En Lin