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softirq.h：源码内容

							/*
 *  include/asm-s390/softirq.h
 *
 *  S390 version
 *
 *  Derived from "include/asm-i386/softirq.h"
 */
#ifndef __ASM_SOFTIRQ_H
#define __ASM_SOFTIRQ_H
#ifndef __LINUX_SMP_H
#include <linux/smp.h>
#endif
#include <asm/atomic.h>
#include <asm/hardirq.h>
#include <asm/lowcore.h>
#define __cpu_bh_enable(cpu) 
                do { barrier(); local_bh_count(cpu)--; } while (0)
#define cpu_bh_disable(cpu) 
                do { local_bh_count(cpu)++; barrier(); } while (0)
#define local_bh_disable()      cpu_bh_disable(smp_processor_id())
#define __local_bh_enable()     __cpu_bh_enable(smp_processor_id())
#define in_softirq() (local_bh_count(smp_processor_id()) != 0)
extern void do_call_softirq(void);
#define local_bh_enable()			          	        
do {							                
        unsigned int *ptr = &local_bh_count(smp_processor_id());        
        barrier();                                                      
        if (!--*ptr)							
		if (softirq_pending(smp_processor_id()))		
			/* Use the async. stack for softirq */		
			do_call_softirq();				
} while (0)
#endif	/* __ASM_SOFTIRQ_H */

						