From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-arch-owner@kernel.org>
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 7A45CC433FE
	for <linux-arch@archiver.kernel.org>; Mon,  7 Nov 2022 09:13:18 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S231656AbiKGJNR (ORCPT <rfc822;linux-arch@archiver.kernel.org>);
        Mon, 7 Nov 2022 04:13:17 -0500
Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41458 "EHLO
        lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S231709AbiKGJNI (ORCPT
        <rfc822;linux-arch@vger.kernel.org>); Mon, 7 Nov 2022 04:13:08 -0500
Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1])
        by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2C73B167EA;
        Mon,  7 Nov 2022 01:13:04 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;
        d=infradead.org; s=casper.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;
        bh=TgT6Bm94xIkPz5pM0AMFJI2S+82t6ITBnJ8g+cjlZvo=; b=mjJXpuwX59z8cofVj+vGaf4g8O
        VUQ0UnZxsjLE0Db1Xz3wYD7Cc48MdqZBGF2Clo5+dqhpX6DX06wYZR6ulXJ49qgGqU3JZmkqZQYDd
        qQkKDFMYho2wLPMBKPP0Y1rckdxdm7owPO+KjMkL8znHBb1tSBpWwgPtrw8LD3Y+eDV5yXrDfDYPU
        Ufo/4v99LUWKrjwUOpKe8b5SmrRZ0byPSR5uKs/a9WuVRCbIH5haTf/e6MHt0biacG8zTy/1z13wO
        l5bwrLUcyBhB/VP5x8RJ/89vO2AMj7ANjsm5M5xYnVyOe/lBWh4RkD662/6ronS6+blm7VjXVzhT8
        Sclm3FtA==;
Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net)
        by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux))
        id 1oryB5-009FLW-3D; Mon, 07 Nov 2022 09:12:23 +0000
Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225])
        (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
         key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256)
        (Client did not present a certificate)
        by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 9CAD330026A;
        Mon,  7 Nov 2022 10:12:10 +0100 (CET)
Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000)
        id 84A6F200F8FC4; Mon,  7 Nov 2022 10:12:07 +0100 (CET)
Date:   Mon, 7 Nov 2022 10:12:07 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     Hugh Dickins <hughd@google.com>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        Alexander Gordeev <agordeev@linux.ibm.com>,
        Will Deacon <will@kernel.org>,
        Aneesh Kumar <aneesh.kumar@linux.ibm.com>,
        Nick Piggin <npiggin@gmail.com>,
        Heiko Carstens <hca@linux.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Christian Borntraeger <borntraeger@linux.ibm.com>,
        Sven Schnelle <svens@linux.ibm.com>,
        Nadav Amit <nadav.amit@gmail.com>,
        Jann Horn <jannh@google.com>,
        John Hubbard <jhubbard@nvidia.com>, X86 ML <x86@kernel.org>,
        Matthew Wilcox <willy@infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        kernel list <linux-kernel@vger.kernel.org>,
        Linux-MM <linux-mm@kvack.org>,
        Andrea Arcangeli <aarcange@redhat.com>,
        "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
        Joerg Roedel <jroedel@suse.de>,
        Uros Bizjak <ubizjak@gmail.com>,
        Alistair Popple <apopple@nvidia.com>,
        linux-arch <linux-arch@vger.kernel.org>
Subject: Re: mm: delay rmap removal until after TLB flush
Message-ID: <Y2jL5+4bC2fxpG8N@hirez.programming.kicks-ass.net>
References: <CAHk-=wjX_P78xoNcGDTjhkgffs-Bhzcwp-mdsE1maeF57Sh0MA@mail.gmail.com>
 <CAHk-=wio=UKK9fX4z+0CnyuZG7L+U9OB7t7Dcrg4FuFHpdSsfw@mail.gmail.com>
 <CAHk-=wgz0QQd6KaRYQ8viwkZBt4xDGuZTFiTB8ifg7E3F2FxHg@mail.gmail.com>
 <CAHk-=wiwt4LC-VmqvYrphraF0=yQV=CQimDCb0XhtXwk8oKCCA@mail.gmail.com>
 <Y1+XCALog8bW7Hgl@hirez.programming.kicks-ass.net>
 <CAHk-=wjnvPA7mi-E3jVEfCWXCNJNZEUjm6XODbbzGOh9c8mhgw@mail.gmail.com>
 <CAHk-=wjjXQP7PTEXO4R76WPy1zfQad_DLKw1GKU_4yWW1N4n7w@mail.gmail.com>
 <Y2SyJuohLFLqIhlZ@li-4a3a4a4c-28e5-11b2-a85c-a8d192c6f089.ibm.com>
 <CAHk-=wjzp65=-QE1dg8KfqG-tVHiT+yAfHXGx9sro=8yOceELg@mail.gmail.com>
 <8a1e97c9-bd5-7473-6da8-2aa75198fbe8@google.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <8a1e97c9-bd5-7473-6da8-2aa75198fbe8@google.com>
Precedence: bulk
List-ID: <linux-arch.vger.kernel.org>
X-Mailing-List: linux-arch@vger.kernel.org


Hi Hugh!

On Sun, Nov 06, 2022 at 01:06:19PM -0800, Hugh Dickins wrote:
> See folio_lock_anon_vma_read(): folio_mapped() plays a key role in
> establishing the continued validity of an anon_vma.  See comments
> above folio_get_anon_vma(), some by me but most by PeterZ IIRC.

Ohhh, you're quite right. Unfortunately I seem to have completely
forgotten about that :-(