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1da177e4c3
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!
30 lines
1003 B
C
30 lines
1003 B
C
/* hardirq.h: PA-RISC hard IRQ support.
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*
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* Copyright (C) 2001 Matthew Wilcox <matthew@wil.cx>
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*
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* The locking is really quite interesting. There's a cpu-local
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* count of how many interrupts are being handled, and a global
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* lock. An interrupt can only be serviced if the global lock
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* is free. You can't be sure no more interrupts are being
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* serviced until you've acquired the lock and then checked
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* all the per-cpu interrupt counts are all zero. It's a specialised
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* br_lock, and that's exactly how Sparc does it. We don't because
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* it's more locking for us. This way is lock-free in the interrupt path.
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*/
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#ifndef _PARISC_HARDIRQ_H
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#define _PARISC_HARDIRQ_H
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#include <linux/threads.h>
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#include <linux/irq.h>
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typedef struct {
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unsigned long __softirq_pending; /* set_bit is used on this */
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} ____cacheline_aligned irq_cpustat_t;
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#include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */
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void ack_bad_irq(unsigned int irq);
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#endif /* _PARISC_HARDIRQ_H */
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