[PATCH v3 hmm 03/11] mm/mmu_notifiers: add a get/put scheme for the registration

[Jason Gunthorpe]

On Wed, Aug 14, 2019 at 02:20:31PM -0700, Ralph Campbell wrote:
> 
> On 8/6/19 4:15 PM, Jason Gunthorpe wrote:
> > From: Jason Gunthorpe <jgg at mellanox.com>
> > 
> > Many places in the kernel have a flow where userspace will create some
> > object and that object will need to connect to the subsystem's
> > mmu_notifier subscription for the duration of its lifetime.
> > 
> > In this case the subsystem is usually tracking multiple mm_structs and it
> > is difficult to keep track of what struct mmu_notifier's have been
> > allocated for what mm's.
> > 
> > Since this has been open coded in a variety of exciting ways, provide core
> > functionality to do this safely.
> > 
> > This approach uses the strct mmu_notifier_ops * as a key to determine if
> 
> s/strct/struct

Yes, thanks for all of this, I like having comments, but I'm a
terrible proofreader :(

Jason