[BUG, REGRESSION] ACPI: Set _PDC

[Jan Pogadl <pogadl.jan@googlemail.com>]

Hi,

with commit commit 5d554a7bb0643a6151a84319bfeba8270bf5269e (ACPI: processor: 
add internal processor_physically_present()) a new function got introduced which 
always fails on machines with CONFIG_SMP disabled. Thus _PDC will never be 
initialized? set?. 

The problem of the processor_physically_present() is, that it calls the 
acpi_get_cpuid(...) function which returns on NON-SMP machines always -1.

Note that i don't have any real knowledge what _PDC actualy realy do, all i 
gatherd so far is that its for switching C-Stats. I Stumbled across this by 
bisecting the problem, that the undervolting patches from
linux-phc.org aren't working anymore with 2.6.34 (2.6.35-rc3). Whereas they 
worked fine with 2.6.33 on my  Samsung X20 Notebook with a Pentium M precossor. 
The acpi-cpufreq is now using System-IO instead of MSR Registers. 

Since i don't know what should be the correct behaviour here i can't
provide any patches. But i doub't it's the correct behaviour of 
processor_physically_present() to always fail on non-SMP machines. 
 
Deleting the function call, to this new function in early_init_pdc(...), 
and i get back the old behaviour.

cheers,
jan