Re: [RFC v2 4/4] powerpc/papr_scm: Add cpu hotplug support for nvdimm pmu device

On 5/25/21 7:46 PM, Peter Zijlstra wrote:

On Tue, May 25, 2021 at 06:52:16PM +0530, Kajol Jain wrote:

quoted

Patch here adds cpu hotplug functions to nvdimm pmu.

I'm thinking "Patch here" qualifies for "This patch", see
Documentation/process/submitting-patches.rst .

Hi Peter,
   I will reword this commit message.

quoted

It adds cpumask to designate a cpu to make HCALL to
collect the counter data for the nvdimm device and
update ABI documentation accordingly.

Result in power9 lpar system:
command:# cat /sys/devices/nmem0/cpumask
0

Is this specific to the papr thing, or should this be in generic nvdimm
code?

This code is not specific to papr device and we can move it to
generic nvdimm interface. But do we need to add some checks on whether
any arch/platform specific driver want that support or we can assume 
that this will be something needed by all platforms?

Thanks,
Kajol Jain