include/asm-parisc/hardirq.h

   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
  21 typedef 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
  27 void ack_bad_irq(unsigned int irq);
  28
  29 #endif /* _PARISC_HARDIRQ_H */