* H. Peter Anvin [off-list ref]:

Alex Chiang wrote:

quoted

Populate the cpu_enabled_map correctly.

Note that this patch does not actually make any decisions based
on the contents of the map.

However, as the map is presented via sysfs in:

	/sys/devices/system/cpu/

It should be populated correctly.

There will be a user-visible change under the above directory.
cpuN/ entries for firmware-disabled CPUs will now appear, whereas
before, they did not due to a check against ACPI_MADT_ENABLED.

The cpuN/ entries will be empty, and the online file in the
above directory will reflect which CPUs are actually schedulable.

Signed-off-by: Alex Chiang <redacted>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <redacted>
Cc: H. Peter Anvin <hpa@zytor.com>

From an x86 standpoint this patchset seems reasonable to me.

Acked-by: H. Peter Anvin <hpa@zytor.com>

Thanks Peter. Let me try and rework the patchset according to
Russell's suggestion here:

	http://lkml.org/lkml/2008/7/18/467

That approach seems cleaner to me.

Obviously, if the sematics of the operations don't make sense
for other  architectures -- which I will leave up to the
affected maintainers --  then that should be carefully
considered if the generic operations can  be done better.

Russell's solution avoids the issue with the ability to #define
the check away for archs that don't care.

cheers,

/ac