1/* hardirq.h: PA-RISC hard IRQ support.
2 *
3 * Copyright (C) 2001 Matthew Wilcox <matthew@wil.cx>
4 *
5 * The locking is really quite interesting.  There's a cpu-local
6 * count of how many interrupts are being handled, and a global
7 * lock.  An interrupt can only be serviced if the global lock
8 * is free.  You can't be sure no more interrupts are being
9 * serviced until you've acquired the lock and then checked
10 * all the per-cpu interrupt counts are all zero.  It's a specialised
11 * br_lock, and that's exactly how Sparc does it.  We don't because
12 * it's more locking for us.  This way is lock-free in the interrupt path.
13 */
14
15#ifndef _PARISC_HARDIRQ_H
16#define _PARISC_HARDIRQ_H
17
18#include <linux/threads.h>
19#include <linux/irq.h>
20
21typedef struct {
22	unsigned long __softirq_pending; /* set_bit is used on this */
23} ____cacheline_aligned irq_cpustat_t;
24
25#include <linux/irq_cpustat.h>	/* Standard mappings for irq_cpustat_t above */
26
27void ack_bad_irq(unsigned int irq);
28
29#endif /* _PARISC_HARDIRQ_H */
30