| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 */ |