linux-kernel - Re: [PATCH v5 1/2] mm/mmu_notifier: make interval notifier updates safe

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Message-ID: <20200114124523.GM20978@mellanox.com>
Date:   Tue, 14 Jan 2020 12:45:26 +0000
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Ralph Campbell <rcampbell@...dia.com>
CC:     "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        Jerome Glisse <jglisse@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        Christoph Hellwig <hch@....de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH v5 1/2] mm/mmu_notifier: make interval notifier updates
 safe

On Mon, Jan 13, 2020 at 02:44:52PM -0800, Ralph Campbell wrote:

> I'm using the device driver lock to serialize find/insert/update/remove
> changes to the interval tree.

The device driver lock can't really fully serialize this as it doesn't
effect how the intersection lookup runs.

Jason