[PATCH v3 hmm 01/11] mm/mmu_notifiers: hoist do_mmu_notifier_register down_write to the caller

[Christoph Hellwig]

On Tue, Aug 06, 2019 at 08:15:38PM -0300, Jason Gunthorpe wrote:
> From: Jason Gunthorpe <jgg at 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 at infradead.org>
> Signed-off-by: Jason Gunthorpe <jgg at mellanox.com>

Looks good:

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