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Subject: Re: [PATCH v3 hmm 01/11] mm/mmu_notifiers: hoist
 do_mmu_notifier_register down_write to the caller
To:     Jason Gunthorpe <jgg@ziepe.ca>, <linux-mm@kvack.org>
CC:     Andrea Arcangeli <aarcange@redhat.com>,
        Christoph Hellwig <hch@lst.de>,
        John Hubbard <jhubbard@nvidia.com>,
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References: <20190806231548.25242-1-jgg@ziepe.ca>
 <20190806231548.25242-2-jgg@ziepe.ca>
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From:   Ralph Campbell <rcampbell@nvidia.com>
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On 8/6/19 4:15 PM, 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>

Nice clean up.
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>