PCPU_MIN_ALLOC_SHIFT   27 include/linux/percpu.h #define PCPU_MIN_ALLOC_SIZE		(1 << PCPU_MIN_ALLOC_SHIFT)
PCPU_MIN_ALLOC_SHIFT   36 include/linux/percpu.h 					 PCPU_MIN_ALLOC_SHIFT)
PCPU_MIN_ALLOC_SHIFT 1611 mm/percpu.c    	bits = size >> PCPU_MIN_ALLOC_SHIFT;
PCPU_MIN_ALLOC_SHIFT 1612 mm/percpu.c    	bit_align = align >> PCPU_MIN_ALLOC_SHIFT;