Description of problem:
when shielding a specific CPU from handling with IRQs in  real time program

Version-Release number of selected component (if applicable):
Redhat-6.7 3.10.0-229.rt56.161.el6rt.x86_64

How reproducible:
Write a time time program 

Steps to Reproduce:
1.#include<linux/irqflags.h>
2.Call some thread functions in main();.
3.Set the thread affinition on a specific cpu.  
3.Call local_irq_disable（）; to shield local cpu from dealing with hard irq in  
a thread function.
4.Compile it.
Actual results:
**/3.10.0-229.rt56.161.el6rt.x86_64/include/asm-generic/irqflags.h:46: undefined reference to `arch_local_irq_restore(unsigned long)'

Expected results:
with no error;

Additional info:
I just the arch_local_irq_restore(unsigned long); declared but definited in the file ,where it goes?