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