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Date:   Thu, 8 Aug 2019 12:24:52 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Jason Gunthorpe <jgg@ziepe.ca>
Cc:     linux-mm@kvack.org, Andrea Arcangeli <aarcange@redhat.com>,
        Christoph Hellwig <hch@lst.de>,
        John Hubbard <jhubbard@nvidia.com>,
        =?iso-8859-1?B?Suly9G1l?= Glisse <jglisse@redhat.com>,
        Ralph Campbell <rcampbell@nvidia.com>,
        "Kuehling, Felix" <Felix.Kuehling@amd.com>,
        Alex Deucher <alexander.deucher@amd.com>,
        Christian =?iso-8859-1?Q?K=F6nig?= <christian.koenig@amd.com>,
        "David (ChunMing) Zhou" <David1.Zhou@amd.com>,
        Dimitri Sivanich <sivanich@sgi.com>,
        dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org,
        iommu@lists.linux-foundation.org, intel-gfx@lists.freedesktop.org,
        Gavin Shan <shangw@linux.vnet.ibm.com>,
        Andrea Righi <andrea@betterlinux.com>,
        Jason Gunthorpe <jgg@mellanox.com>,
        Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH v3 hmm 01/11] mm/mmu_notifiers: hoist
 do_mmu_notifier_register down_write to the caller
Message-ID: <20190808102452.GA648@lst.de>
References: <20190806231548.25242-1-jgg@ziepe.ca> <20190806231548.25242-2-jgg@ziepe.ca>
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On Tue, Aug 06, 2019 at 08:15:38PM -0300, Jason Gunthorpe wrote:
> From: Jason Gunthorpe <jgg@mellanox.com>
> 
> This simplifies the code to not have so many one line functions and extra
> logic. __mmu_notifier_register() simply becomes the entry point to
> register the notifier, and the other one calls it under lock.
> 
> Also add a lockdep_assert to check that the callers are holding the lock
> as expected.
> 
> Suggested-by: Christoph Hellwig <hch@infradead.org>
> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>