Re: [PATCH v3 09/21] libnd, nd_pmem: add libnd support to the pmem driver

[Dan Williams]

On Sat, May 23, 2015 at 7:39 AM, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
> On Wed, May 20, 2015 at 04:57:00PM -0400, Dan Williams wrote:
>> nd_pmem attaches to persistent memory regions and namespaces emitted by
>> the libnd subsystem, and, same as the original pmem driver, presents the
>> system-physical-address range as a block device.
>>
>> The existing e820-type-12 to pmem setup is converted to a full libnd bus
>> that emits an nd_namespace_io device.
>
> This looks completely bonkers.  If you want to pretend the legacy
> e820 NVDIMMs fit into your new world do that directly in
> arch/x86/kernel/pmem.c instead of splitting it over two files.

I was looking to preserve the ability to keep libnd as a module, but
it doesn't really matter given the small number of systems that will
end up caring about X86_PMEM_LEGACY in the near term.  I'll skip the
platform device infrastructure and just register the pmem regions
directly from arch/x86/kernel/pmem.c.
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