NR_CPUS 's value

["Bao zhao" <paozhaokeats@xxxxxxxxxxx>]

 In kernel, NR_CPU  is macro and represents the number of CPUs. Many arrays 
use it to define array's size . But the number of CPUs can be known only 
when smp machine boot, so when compling  the kernel , NR_CPU has no value.
  I am cofused by it .

Anybody's guides appreciated, Thanks!

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