[RESEND 2/3] powerpc/memcpy: Add memcpy_mcsafe for pmem

[Dan Williams]

On Thu, Apr 5, 2018 at 8:00 AM, Dan Williams <dan.j.williams at intel.com> wrote:
> On Wed, Apr 4, 2018 at 11:45 PM, Nicholas Piggin <npiggin at gmail.com> wrote:
[,,]
>> What's the problem with just counting bytes copied like usercopy --
>> why is that harder than cacheline accuracy?
>>
>>> I'd rather implement the existing interface and port/support the new interface
>>> as it becomes available
>>
>> Fair enough.
>
> I have patches already in progress to change the interface. My
> preference is to hold off on adding a new implementation that will
> need to be immediately reworked. When I say "immediate" I mean that
> should be able to post what I have for review within the next few
> days.
>
> Whether this is all too late for 4.17 is another question...

Here is the x86 version of a 'bytes remaining' memcpy_mcsafe() implemenation:

    https://lists.01.org/pipermail/linux-nvdimm/2018-May/015548.html