Re: [PATCH v2 3/7] ACPI: Add _OST support for sysfs eject

Shuah Khan
2012-05-10T15:40:31Z

On Wed, 2012-05-09 at 12:16 -0600, Toshi Kani wrote:

> > >
> > > Added macro definitions of _OST source events and status codes.
> > > Also renamed OSC_SB_CPUHP_OST_SUPPORT to OSC_SB_HOTPLUG_OST_SUPPORT
> > > since this _OSC bit is not specific to CPU hotplug. This bit is
> > > defined in Table 6-147 of ACPI 5.0 as follows.

Sorry. Missed that. It was in patch 7. Any reason why this feature is
split across 7 patches? Might be better to combine patches 1, 2, and 7
as it contains the infrastructure type code for _OST. Something to
consider.

There is no functional change with this patch set in the sense that _OST
doesn't get evaluated on platforms that don't support _OST, however
there is run-time change on all architectures with patches 3, 4, and 5.
There are couple of new kfree() calls introduced. Something to take a
closer to make sure it is safe in that path.

Also, what missing functionality does evaluating _OST add to the kernel?
What happens if OS continues to not evaluate _OST? It is an optional
method, looking for what is the value add?

-- Shuah