From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=7kxT=26=kvack.org=owner-linux-mm@kernel.org>
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=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,
	DKIM_VALID,DKIM_VALID_AU,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 85932C47409
	for <linux-mm@archiver.kernel.org>; Thu,  9 Jan 2020 22:07:43 +0000 (UTC)
Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17])
	by mail.kernel.org (Postfix) with ESMTP id 498CF2077B
	for <linux-mm@archiver.kernel.org>; Thu,  9 Jan 2020 22:07:43 +0000 (UTC)
Authentication-Results: mail.kernel.org;
	dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="pAGT+6E4"
DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 498CF2077B
Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nvidia.com
Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org
Received: by kanga.kvack.org (Postfix)
	id DD01A8E0005; Thu,  9 Jan 2020 17:07:42 -0500 (EST)
Received: by kanga.kvack.org (Postfix, from userid 40)
	id D809D8E0001; Thu,  9 Jan 2020 17:07:42 -0500 (EST)
X-Delivered-To: int-list-linux-mm@kvack.org
Received: by kanga.kvack.org (Postfix, from userid 63042)
	id C6E3D8E0005; Thu,  9 Jan 2020 17:07:42 -0500 (EST)
X-Delivered-To: linux-mm@kvack.org
Received: from forelay.hostedemail.com (smtprelay0107.hostedemail.com [216.40.44.107])
	by kanga.kvack.org (Postfix) with ESMTP id B12F58E0001
	for <linux-mm@kvack.org>; Thu,  9 Jan 2020 17:07:42 -0500 (EST)
Received: from smtpin21.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251])
	by forelay01.hostedemail.com (Postfix) with SMTP id 708A2180AD801
	for <linux-mm@kvack.org>; Thu,  9 Jan 2020 22:07:42 +0000 (UTC)
X-FDA: 76359483564.21.hose60_604fb08bbbd28
X-HE-Tag: hose60_604fb08bbbd28
X-Filterd-Recvd-Size: 4742
Received: from hqnvemgate26.nvidia.com (hqnvemgate26.nvidia.com [216.228.121.65])
	by imf16.hostedemail.com (Postfix) with ESMTP
	for <linux-mm@kvack.org>; Thu,  9 Jan 2020 22:07:41 +0000 (UTC)
Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate26.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA)
	id <B5e17a4190000>; Thu, 09 Jan 2020 14:07:21 -0800
Received: from hqmail.nvidia.com ([172.20.161.6])
  by hqpgpgate101.nvidia.com (PGP Universal service);
  Thu, 09 Jan 2020 14:07:39 -0800
X-PGP-Universal: processed;
	by hqpgpgate101.nvidia.com on Thu, 09 Jan 2020 14:07:39 -0800
Received: from [10.110.48.28] (10.124.1.5) by HQMAIL107.nvidia.com
 (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Thu, 9 Jan
 2020 22:07:38 +0000
Subject: Re: [PATCH v12 00/22] mm/gup: prereqs to track dma-pinned pages:
 FOLL_PIN
To: Andrew Morton <akpm@linux-foundation.org>
CC: Al Viro <viro@zeniv.linux.org.uk>, Alex Williamson
	<alex.williamson@redhat.com>, Benjamin Herrenschmidt
	<benh@kernel.crashing.org>, =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?=
	<bjorn.topel@intel.com>, Christoph Hellwig <hch@infradead.org>, Dan Williams
	<dan.j.williams@intel.com>, Daniel Vetter <daniel@ffwll.ch>, Dave Chinner
	<david@fromorbit.com>, David Airlie <airlied@linux.ie>, "David S . Miller"
	<davem@davemloft.net>, Ira Weiny <ira.weiny@intel.com>, Jan Kara
	<jack@suse.cz>, Jason Gunthorpe <jgg@ziepe.ca>, Jens Axboe <axboe@kernel.dk>,
	Jonathan Corbet <corbet@lwn.net>, =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?=
	<jglisse@redhat.com>, "Kirill A . Shutemov" <kirill@shutemov.name>, Magnus
 Karlsson <magnus.karlsson@intel.com>, Mauro Carvalho Chehab
	<mchehab@kernel.org>, Michael Ellerman <mpe@ellerman.id.au>, Michal Hocko
	<mhocko@suse.com>, Mike Kravetz <mike.kravetz@oracle.com>, Paul Mackerras
	<paulus@samba.org>, Shuah Khan <shuah@kernel.org>, Vlastimil Babka
	<vbabka@suse.cz>, <bpf@vger.kernel.org>, <dri-devel@lists.freedesktop.org>,
	<kvm@vger.kernel.org>, <linux-block@vger.kernel.org>,
	<linux-doc@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>,
	<linux-kselftest@vger.kernel.org>, <linux-media@vger.kernel.org>,
	<linux-rdma@vger.kernel.org>, <linuxppc-dev@lists.ozlabs.org>,
	<netdev@vger.kernel.org>, <linux-mm@kvack.org>, LKML
	<linux-kernel@vger.kernel.org>
References: <20200107224558.2362728-1-jhubbard@nvidia.com>
From: John Hubbard <jhubbard@nvidia.com>
X-Nvconfidentiality: public
Message-ID: <2a9145d4-586e-6489-64e4-0c54f47afaa1@nvidia.com>
Date: Thu, 9 Jan 2020 14:07:38 -0800
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101
 Thunderbird/68.3.1
MIME-Version: 1.0
In-Reply-To: <20200107224558.2362728-1-jhubbard@nvidia.com>
X-Originating-IP: [10.124.1.5]
X-ClientProxiedBy: HQMAIL111.nvidia.com (172.20.187.18) To
 HQMAIL107.nvidia.com (172.20.187.13)
Content-Type: text/plain; charset="utf-8"
Content-Language: en-US
Content-Transfer-Encoding: 7bit
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1;
	t=1578607641; bh=+NEvkiCKN4muU9xEMv7O0vL5DDgA+srq0dD5KyM2g5Y=;
	h=X-PGP-Universal:Subject:To:CC:References:From:X-Nvconfidentiality:
	 Message-ID:Date:User-Agent:MIME-Version:In-Reply-To:
	 X-Originating-IP:X-ClientProxiedBy:Content-Type:Content-Language:
	 Content-Transfer-Encoding;
	b=pAGT+6E4t/5Sgzls83W8rrhD73PbNnbQX0v+uLgN6NdK6ox1s0YILXA5+Q9WkB7U5
	 Qgdq4MfQKXM00HXiVUvw/MN1+0Npjsn2yckDImY4OPUy9vKTHUQrRr5b/32qyPv6Y4
	 G8uphKhloBfTQ9ova5uKctNKv/z/ybtCLuSP2dniMP6oLwVdc9frqv+uSdiahegES7
	 HZtKpaUzMnUGCyRfUKLB2LXhSyGZIEwOR/UkaAhKUOx0B4NaRtt8Qz56svVPCLTYZD
	 6dBjR9cwNa9He9WTH1/ZpC5nBgZ5v8YIJX6cYUd/1MLjMgnC8wrJfdT7uC+HoO76Fq
	 StnhQb6FNJNXA==
X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4
Sender: owner-linux-mm@kvack.org
Precedence: bulk
X-Loop: owner-majordomo@kvack.org
List-ID: <linux-mm.kvack.org>

On 1/7/20 2:45 PM, John Hubbard wrote:
> Hi,
> 
> The "track FOLL_PIN pages" would have been the very next patch, but it is
> not included here because I'm still debugging a bug report from Leon.
> Let's get all of the prerequisite work (it's been reviewed) into the tree
> so that future reviews are easier. It's clear that any fixes that are
> required to the tracking patch, won't affect these patches here.
> 
> This implements an API naming change (put_user_page*() -->
> unpin_user_page*()), and also adds FOLL_PIN page support, up to
> *but not including* actually tracking FOLL_PIN pages. It extends
> the FOLL_PIN support to a few select subsystems. More subsystems will
> be added in follow up work.
> 

Hi Andrew and all,

To clarify: I'm hoping that this series can go into 5.6.

Meanwhile, I'm working on tracking down and solving the problem that Leon
reported, in the "track FOLL_PIN pages" patch, and that patch is not part of
this series.

thanks,
-- 
John Hubbard
NVIDIA