NMI_SHIFT          40 include/linux/preempt_mask.h #define NMI_MASK	(__IRQ_MASK(NMI_BITS)     << NMI_SHIFT)
NMI_SHIFT          45 include/linux/preempt_mask.h #define NMI_OFFSET	(1UL << NMI_SHIFT)
NMI_SHIFT          50 include/linux/preempt_mask.h #define PREEMPT_ACTIVE_SHIFT	(NMI_SHIFT + NMI_BITS)