kernel-ark/include/asm-parisc/hardirq.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

30 lines
1003 B
C

/* hardirq.h: PA-RISC hard IRQ support.
*
* Copyright (C) 2001 Matthew Wilcox <matthew@wil.cx>
*
* 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.
*/
#ifndef _PARISC_HARDIRQ_H
#define _PARISC_HARDIRQ_H
#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 */