On Fri, 2021-03-19 at 11:20 +0530, Santosh Sivaraj wrote:
> "Verma, Vishal L" <[email protected]> writes:
[..]
> >
> > fix multi line comment to the right formatting:
> > /*
> > * line 1, etc
> > */
> >
>
> Will fix that.
>
> > > + if (access("/sys/bus/acpi", F_OK) == -1) {
> > > + if (errno == ENOENT)
> > > + family = NVDIMM_FAMILY_PAPR;
> > > + }
> >
> > Instead of a blind default, can we perform a similar check for presence of
> > PAPR too?
> >
>
> Yes, I wanted to do that, but there is no reliable way of check that; there is
> no ofnode before module load, and there won't be any PAPR specific DT entries
> if
> the platform is not Power.
>
> I also test the 'ndtest' module on x86 with NDCTL_TEST_FAMILY environment
> variable. I can let the default be nfit_test (NVDIMM_FAMILY_INTEL) and only
> load
> PAPR module when the environment variable is set. Thoughts?
>
The env variable seems reasonable to me. If there is ever a third
'family' adding tests, having an arbitrary default might be awkward.
I may suggest - if acpi is detected, use NFIT. If env has something that
is known, e.g. PAPR, use that. If env is unset or doesn't match anything
we know about, then bail with an error message. Does that sound
reasonable?
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