"Aneesh Kumar K.V" [off-list ref] writes:

Shivaprasad G Bhat [off-list ref] writes:

quoted

Add support for ND_REGION_ASYNC capability if the device tree
indicates 'ibm,hcall-flush-required' property in the NVDIMM node.
Flush is done by issuing H_SCM_FLUSH hcall to the hypervisor.

If the flush request failed, the hypervisor is expected to
to reflect the problem in the subsequent nvdimm H_SCM_HEALTH call.

This patch prevents mmap of namespaces with MAP_SYNC flag if the
nvdimm requires an explicit flush[1].

References:
[1] https://github.com/avocado-framework-tests/avocado-misc-tests/blob/master/memory/ndctl.py.data/map_sync.c

Reviewed-by: Aneesh Kumar K.V <redacted>

Do we need an ack from nvdimm folks on this?

Or is it entirely powerpc internal (seems like it from the diffstat)?

cheers