linux-kernel - Re: [PATCH 03/22] mm: remove hmm_devmem_add

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Date:   Thu, 13 Jun 2019 18:52:44 +0000
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Christoph Hellwig <hch@....de>
CC:     Dan Williams <dan.j.williams@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/22] mm: remove hmm_devmem_add_resource

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.

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.

Reviewed-by: Jason Gunthorpe <jgg@...lanox.com>

Jason