From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?UTF-8?q?Thomas=20Hellstr=C3=B6m=20=28VMware=29?=
 <thellstrom@vmwopensource.org>
Subject: [PATCH v6 1/9] mm: Allow the [page|pfn]_mkwrite callbacks to drop the
 mmap_sem
Date: Wed, 12 Jun 2019 17:19:42 +0200
Message-ID: <20190612151950.2870-2-thellstrom@vmwopensource.org>
References: <20190612151950.2870-1-thellstrom@vmwopensource.org>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <dri-devel-bounces@lists.freedesktop.org>
Received: from pio-pvt-msa2.bahnhof.se (pio-pvt-msa2.bahnhof.se [79.136.2.41])
 by gabe.freedesktop.org (Postfix) with ESMTPS id 0C1F0896E4
 for <dri-devel@lists.freedesktop.org>; Wed, 12 Jun 2019 15:20:37 +0000 (UTC)
In-Reply-To: <20190612151950.2870-1-thellstrom@vmwopensource.org>
List-Unsubscribe: <https://lists.freedesktop.org/mailman/options/dri-devel>,
 <mailto:dri-devel-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <https://lists.freedesktop.org/archives/dri-devel>
List-Post: <mailto:dri-devel@lists.freedesktop.org>
List-Help: <mailto:dri-devel-request@lists.freedesktop.org?subject=help>
List-Subscribe: <https://lists.freedesktop.org/mailman/listinfo/dri-devel>,
 <mailto:dri-devel-request@lists.freedesktop.org?subject=subscribe>
Errors-To: dri-devel-bounces@lists.freedesktop.org
Sender: "dri-devel" <dri-devel-bounces@lists.freedesktop.org>
To: dri-devel@lists.freedesktop.org
Cc: Thomas Hellstrom <thellstrom@vmware.com>, Michal Hocko <mhocko@suse.com>, Rik van Riel <riel@surriel.com>, pv-drivers@vmware.com, Minchan Kim <minchan@kernel.org>, Will Deacon <will.deacon@arm.com>, linux-kernel@vger.kernel.org, Matthew Wilcox <willy@infradead.org>, hch@infradead.org, Peter Zijlstra <peterz@infradead.org>, =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= <jglisse@redhat.com>, linux-graphics-maintainer@vmware.com, Souptick Joarder <jrdr.linux@gmail.com>, Huang Ying <ying.huang@intel.com>, Andrew Morton <akpm@linux-foundation.org>, Ralph Campbell <rcampbell@nvidia.com>, linux-mm@kvack.org
List-Id: dri-devel@lists.freedesktop.org
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