include/asm-arm/hardirq.h

#ifndef __ASM_HARDIRQ_H
#define __ASM_HARDIRQ_H

#include <linux/config.h>
#include <linux/cache.h>
#include <linux/threads.h>

/* softirq.h is sensitive to the offsets of these fields */
typedef struct {
	unsigned int __softirq_pending;
	unsigned int __local_irq_count;
	unsigned int __local_bh_count;
	unsigned int __syscall_count;
	struct task_struct * __ksoftirqd_task; /* waitqueue is too large */
} ____cacheline_aligned irq_cpustat_t;

#include <linux/irq_cpustat.h>	/* Standard mappings for irq_cpustat_t above */

/*
 * Are we in an interrupt context? Either doing bottom half
 * or hardware interrupt processing?
 */
#define in_interrupt() ({ const int __cpu = smp_processor_id(); \
	(local_irq_count(__cpu) + local_bh_count(__cpu) != 0); })

#define in_irq() (local_irq_count(smp_processor_id()) != 0)

#ifndef CONFIG_SMP

#define hardirq_trylock(cpu)	(local_irq_count(cpu) == 0)
#define hardirq_endlock(cpu)	do { } while (0)

#define irq_enter(cpu,irq)	(local_irq_count(cpu)++)
#define irq_exit(cpu,irq)	(local_irq_count(cpu)--)

#define synchronize_irq()	do { } while (0)

#else
#error SMP not supported
#endif /* CONFIG_SMP */

#endif /* __ASM_HARDIRQ_H */