[PATCH 16/17] memremap: change devm_memremap_pages interface to use struct dev_pagemap

[Dan Williams]

On Fri, Dec 15, 2017 at 6:09 AM, Christoph Hellwig <hch at lst.de> wrote:
> From: Logan Gunthorpe <logang at deltatee.com>
>
> This new interface is similar to how struct device (and many others)
> work. The caller initializes a 'struct dev_pagemap' as required
> and calls 'devm_memremap_pages'. This allows the pagemap structure to
> be embedded in another structure and thus container_of can be used. In
> this way application specific members can be stored in a containing
> struct.
>
> This will be used by the P2P infrastructure and HMM could probably
> be cleaned up to use it as well (instead of having it's own, similar
> 'hmm_devmem_pages_create' function).
>
> Signed-off-by: Logan Gunthorpe <logang at deltatee.com>
> Signed-off-by: Christoph Hellwig <hch at lst.de>

Looks good, I notice that this does not initialize pgmap->type to
MEMORY_DEVICE_HOST, but since that value is zero and likely won't
change we're ok.

Reviewed-by: Dan Williams <dan.j.williams at intel.com>