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Date: Thu, 15 Jun 2017 13:43:25 -0400 (EDT)
From: Jerome Glisse <jglisse@redhat.com>
To: zhong jiang <zhongjiang@huawei.com>
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, Dan Williams <dan.j.williams@intel.com>,
        "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
        John Hubbard <jhubbard@nvidia.com>,
        Ross Zwisler <ross.zwisler@linux.intel.com>
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References: <20170524172024.30810-1-jglisse@redhat.com> <20170524172024.30810-8-jglisse@redhat.com> <59420204.905@huawei.com>
Subject: Re: [HMM 07/15] mm/ZONE_DEVICE: new type of ZONE_DEVICE for
 unaddressable memory v3
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> On 2017/5/25 1:20, Jérôme Glisse wrote:

[...]

> > diff --git a/mm/Kconfig b/mm/Kconfig
> > index d744cff..f5357ff 100644
> > --- a/mm/Kconfig
> > +++ b/mm/Kconfig
> > @@ -736,6 +736,19 @@ config ZONE_DEVICE
> >  
> >  	  If FS_DAX is enabled, then say Y.
> >  
> > +config DEVICE_PRIVATE
> > +	bool "Unaddressable device memory (GPU memory, ...)"
> > +	depends on X86_64
> > +	depends on ZONE_DEVICE
> > +	depends on MEMORY_HOTPLUG
> > +	depends on MEMORY_HOTREMOVE
> > +	depends on SPARSEMEM_VMEMMAP
> > +
>  maybe just depends on ARCH_HAS_HMM is enough.

I have updated that as part of HMM CDM patchset.