question about cpu_active_mask

[Mark Hounschell]

I hope it is OK to ask a newbie question here. I'm trying to better 
understand the boot process. I can't seem to find where in the kernel 
sources the cpu_active_mask (defined in include/linux/cpumask.h) gets 
populated. I can see that it does get populated as it brings cpus online 
but it is not obvious to me where. I'm using a 32 bit 3.4.x flavor kernel.

Sorry for the noise and thanks for any pointers

Regards
Mark
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