[PATCH v2] powerpc/pseries: Fix maximum memory value

Aravinda Prasad aravinda at linux.vnet.ibm.com
Mon Jul 1 14:03:24 AEST 2019

On Friday 28 June 2019 10:57 PM, Nathan Lynch wrote:
> Aravinda Prasad <aravinda at linux.vnet.ibm.com> writes:
>> Calculating the maximum memory based on the number of lmbs
>> and lmb size does not account for the RMA region. Hence
>> use memory_hotplug_max(), which already accounts for the
>> RMA region, to fetch the maximum memory value. Thanks to
>> Nathan Lynch for suggesting the memory_hotplug_max()
>> function.
> Well, I hope I haven't led you astray... will it give you the desired
> result on a kernel configured without memory hotplug support, booted in
> an LPAR with some huge pages configured?

Yes. I have tested the patch both with CONFIG_MEMORY_HOTPLUG set and not
set. It is working as expected.


> If so, then
> Acked-by: Nathan Lynch <nathanl at linux.ibm.com>
> It would likely help with review and future maintenance if the semantics
> and intended use of the MaxMem field are made a little more
> explicit. For example, is it supposed to include persistent memory?
> Perhaps a follow-up patch could address this. Or maybe I'm overthinking
> it.


More information about the Linuxppc-dev mailing list