Re: [PATCH 03/22] mm: remove hmm_devmem_add_resource

Christoph Hellwig
2019-06-14T06:19:46Z

On Thu, Jun 13, 2019 at 06:52:44PM +0000, Jason Gunthorpe wrote:
> On Thu, Jun 13, 2019 at 11:43:06AM +0200, Christoph Hellwig wrote:
> > This function has never been used since it was first added to the kernel
> > more than a year and a half ago, and if we ever grow a consumer of the
> > MEMORY_DEVICE_PUBLIC infrastructure it can easily use devm_memremap_pages
> > directly now that we've simplified the API for it.
>
> nit: Have we simplified the interface for devm_memremap_pages() at
> this point, or are you talking about later patches in this series.

After this series. I've just droped that part of the sentence to
avoid confusion.

> I checked this and all the called functions are exported symbols, so
> there is no blocker for a future driver to call devm_memremap_pages(),
> maybe even with all this boiler plate, in future.
>
> If we eventually get many users that need some simplified registration
> then we should add a devm_memremap_pages_simplified() interface and
> factor out that code when we can see the pattern.

After this series devm_memremap_pages already is simpler to use than
hmm_device_add_resource was before, so I'm not worried at all. The
series actually net removes lines from noveau (if only a few).