1#ifndef __ASM_HARDIRQ_H
2#define __ASM_HARDIRQ_H
3
4#include <linux/config.h>
5#include <linux/cache.h>
6#include <linux/threads.h>
7
8/* softirq.h is sensitive to the offsets of these fields */
9typedef struct {
10	unsigned int __softirq_pending;
11	unsigned int __local_irq_count;
12	unsigned int __local_bh_count;
13	unsigned int __syscall_count;
14	struct task_struct * __ksoftirqd_task; /* waitqueue is too large */
15} ____cacheline_aligned irq_cpustat_t;
16
17#include <linux/irq_cpustat.h>	/* Standard mappings for irq_cpustat_t above */
18
19/*
20 * Are we in an interrupt context? Either doing bottom half
21 * or hardware interrupt processing?
22 */
23#define in_interrupt() ({ const int __cpu = smp_processor_id(); \
24	(local_irq_count(__cpu) + local_bh_count(__cpu) != 0); })
25
26#define in_irq() (local_irq_count(smp_processor_id()) != 0)
27
28#ifndef CONFIG_SMP
29
30#define hardirq_trylock(cpu)	(local_irq_count(cpu) == 0)
31#define hardirq_endlock(cpu)	do { } while (0)
32
33#define irq_enter(cpu,irq)	(local_irq_count(cpu)++)
34#define irq_exit(cpu,irq)	(local_irq_count(cpu)--)
35
36#define synchronize_irq()	do { } while (0)
37
38#else
39#error SMP not supported
40#endif /* CONFIG_SMP */
41
42#endif /* __ASM_HARDIRQ_H */
43