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/* hardirq.h: PA-RISC hard IRQ support.
* Copyright (C) 2001 Matthew Wilcox <>
* The locking is really quite interesting. There's a cpu-local
* count of how many interrupts are being handled, and a global
* lock. An interrupt can only be serviced if the global lock
* is free. You can't be sure no more interrupts are being
* serviced until you've acquired the lock and then checked
* all the per-cpu interrupt counts are all zero. It's a specialised
* br_lock, and that's exactly how Sparc does it. We don't because
* it's more locking for us. This way is lock-free in the interrupt path.
#include <linux/threads.h>
#include <linux/irq.h>
typedef struct {
unsigned long __softirq_pending; /* set_bit is used on this */
} ____cacheline_aligned irq_cpustat_t;
#include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */
void ack_bad_irq(unsigned int irq);
#endif /* _PARISC_HARDIRQ_H */