hardirq.h.txt

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这个文件定义了

typedef struct {
        unsigned int __softirq_active;		//32位，相当于active_bh
        unsigned int __softirq_mask;		//32位，相当于mask_bh
        unsigned int __local_irq_count;
        unsigned int __local_bh_count;
        unsigned int __syscall_count;
        unsigned int __nmi_count;       /* arch dependent */
} ____cacheline_aligned irq_cpustat_t;

#define in_interrupt()		//检验是否处于中断中。