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TOMOYO Linux Cross Reference
Linux/include/linux/interrupt.h

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  1 /* interrupt.h */
  2 #ifndef _LINUX_INTERRUPT_H
  3 #define _LINUX_INTERRUPT_H
  4 
  5 #include <linux/kernel.h>
  6 #include <linux/linkage.h>
  7 #include <linux/bitops.h>
  8 #include <linux/preempt.h>
  9 #include <linux/cpumask.h>
 10 #include <linux/irqreturn.h>
 11 #include <linux/irqnr.h>
 12 #include <linux/hardirq.h>
 13 #include <linux/irqflags.h>
 14 #include <linux/smp.h>
 15 #include <linux/percpu.h>
 16 #include <linux/hrtimer.h>
 17 #include <linux/kref.h>
 18 #include <linux/workqueue.h>
 19 
 20 #include <linux/atomic.h>
 21 #include <asm/ptrace.h>
 22 
 23 /*
 24  * These correspond to the IORESOURCE_IRQ_* defines in
 25  * linux/ioport.h to select the interrupt line behaviour.  When
 26  * requesting an interrupt without specifying a IRQF_TRIGGER, the
 27  * setting should be assumed to be "as already configured", which
 28  * may be as per machine or firmware initialisation.
 29  */
 30 #define IRQF_TRIGGER_NONE       0x00000000
 31 #define IRQF_TRIGGER_RISING     0x00000001
 32 #define IRQF_TRIGGER_FALLING    0x00000002
 33 #define IRQF_TRIGGER_HIGH       0x00000004
 34 #define IRQF_TRIGGER_LOW        0x00000008
 35 #define IRQF_TRIGGER_MASK       (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \
 36                                  IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)
 37 #define IRQF_TRIGGER_PROBE      0x00000010
 38 
 39 /*
 40  * These flags used only by the kernel as part of the
 41  * irq handling routines.
 42  *
 43  * IRQF_DISABLED - keep irqs disabled when calling the action handler.
 44  *                 DEPRECATED. This flag is a NOOP and scheduled to be removed
 45  * IRQF_SHARED - allow sharing the irq among several devices
 46  * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
 47  * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
 48  * IRQF_PERCPU - Interrupt is per cpu
 49  * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
 50  * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
 51  *                registered first in an shared interrupt is considered for
 52  *                performance reasons)
 53  * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished.
 54  *                Used by threaded interrupts which need to keep the
 55  *                irq line disabled until the threaded handler has been run.
 56  * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend
 57  * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set
 58  * IRQF_NO_THREAD - Interrupt cannot be threaded
 59  * IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device
 60  *                resume time.
 61  */
 62 #define IRQF_DISABLED           0x00000020
 63 #define IRQF_SHARED             0x00000080
 64 #define IRQF_PROBE_SHARED       0x00000100
 65 #define __IRQF_TIMER            0x00000200
 66 #define IRQF_PERCPU             0x00000400
 67 #define IRQF_NOBALANCING        0x00000800
 68 #define IRQF_IRQPOLL            0x00001000
 69 #define IRQF_ONESHOT            0x00002000
 70 #define IRQF_NO_SUSPEND         0x00004000
 71 #define IRQF_FORCE_RESUME       0x00008000
 72 #define IRQF_NO_THREAD          0x00010000
 73 #define IRQF_EARLY_RESUME       0x00020000
 74 
 75 #define IRQF_TIMER              (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
 76 
 77 /*
 78  * These values can be returned by request_any_context_irq() and
 79  * describe the context the interrupt will be run in.
 80  *
 81  * IRQC_IS_HARDIRQ - interrupt runs in hardirq context
 82  * IRQC_IS_NESTED - interrupt runs in a nested threaded context
 83  */
 84 enum {
 85         IRQC_IS_HARDIRQ = 0,
 86         IRQC_IS_NESTED,
 87 };
 88 
 89 typedef irqreturn_t (*irq_handler_t)(int, void *);
 90 
 91 /**
 92  * struct irqaction - per interrupt action descriptor
 93  * @handler:    interrupt handler function
 94  * @name:       name of the device
 95  * @dev_id:     cookie to identify the device
 96  * @percpu_dev_id:      cookie to identify the device
 97  * @next:       pointer to the next irqaction for shared interrupts
 98  * @irq:        interrupt number
 99  * @flags:      flags (see IRQF_* above)
100  * @thread_fn:  interrupt handler function for threaded interrupts
101  * @thread:     thread pointer for threaded interrupts
102  * @thread_flags:       flags related to @thread
103  * @thread_mask:        bitmask for keeping track of @thread activity
104  * @dir:        pointer to the proc/irq/NN/name entry
105  */
106 struct irqaction {
107         irq_handler_t           handler;
108         void                    *dev_id;
109         void __percpu           *percpu_dev_id;
110         struct irqaction        *next;
111         irq_handler_t           thread_fn;
112         struct task_struct      *thread;
113         unsigned int            irq;
114         unsigned int            flags;
115         unsigned long           thread_flags;
116         unsigned long           thread_mask;
117         const char              *name;
118         struct proc_dir_entry   *dir;
119 } ____cacheline_internodealigned_in_smp;
120 
121 extern irqreturn_t no_action(int cpl, void *dev_id);
122 
123 extern int __must_check
124 request_threaded_irq(unsigned int irq, irq_handler_t handler,
125                      irq_handler_t thread_fn,
126                      unsigned long flags, const char *name, void *dev);
127 
128 static inline int __must_check
129 request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
130             const char *name, void *dev)
131 {
132         return request_threaded_irq(irq, handler, NULL, flags, name, dev);
133 }
134 
135 extern int __must_check
136 request_any_context_irq(unsigned int irq, irq_handler_t handler,
137                         unsigned long flags, const char *name, void *dev_id);
138 
139 extern int __must_check
140 request_percpu_irq(unsigned int irq, irq_handler_t handler,
141                    const char *devname, void __percpu *percpu_dev_id);
142 
143 extern void free_irq(unsigned int, void *);
144 extern void free_percpu_irq(unsigned int, void __percpu *);
145 
146 struct device;
147 
148 extern int __must_check
149 devm_request_threaded_irq(struct device *dev, unsigned int irq,
150                           irq_handler_t handler, irq_handler_t thread_fn,
151                           unsigned long irqflags, const char *devname,
152                           void *dev_id);
153 
154 static inline int __must_check
155 devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
156                  unsigned long irqflags, const char *devname, void *dev_id)
157 {
158         return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
159                                          devname, dev_id);
160 }
161 
162 extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
163 
164 /*
165  * On lockdep we dont want to enable hardirqs in hardirq
166  * context. Use local_irq_enable_in_hardirq() to annotate
167  * kernel code that has to do this nevertheless (pretty much
168  * the only valid case is for old/broken hardware that is
169  * insanely slow).
170  *
171  * NOTE: in theory this might break fragile code that relies
172  * on hardirq delivery - in practice we dont seem to have such
173  * places left. So the only effect should be slightly increased
174  * irqs-off latencies.
175  */
176 #ifdef CONFIG_LOCKDEP
177 # define local_irq_enable_in_hardirq()  do { } while (0)
178 #else
179 # define local_irq_enable_in_hardirq()  local_irq_enable()
180 #endif
181 
182 extern void disable_irq_nosync(unsigned int irq);
183 extern void disable_irq(unsigned int irq);
184 extern void disable_percpu_irq(unsigned int irq);
185 extern void enable_irq(unsigned int irq);
186 extern void enable_percpu_irq(unsigned int irq, unsigned int type);
187 
188 /* The following three functions are for the core kernel use only. */
189 extern void suspend_device_irqs(void);
190 extern void resume_device_irqs(void);
191 #ifdef CONFIG_PM_SLEEP
192 extern int check_wakeup_irqs(void);
193 #else
194 static inline int check_wakeup_irqs(void) { return 0; }
195 #endif
196 
197 #if defined(CONFIG_SMP)
198 
199 extern cpumask_var_t irq_default_affinity;
200 
201 /* Internal implementation. Use the helpers below */
202 extern int __irq_set_affinity(unsigned int irq, const struct cpumask *cpumask,
203                               bool force);
204 
205 /**
206  * irq_set_affinity - Set the irq affinity of a given irq
207  * @irq:        Interrupt to set affinity
208  * @mask:       cpumask
209  *
210  * Fails if cpumask does not contain an online CPU
211  */
212 static inline int
213 irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
214 {
215         return __irq_set_affinity(irq, cpumask, false);
216 }
217 
218 /**
219  * irq_force_affinity - Force the irq affinity of a given irq
220  * @irq:        Interrupt to set affinity
221  * @mask:       cpumask
222  *
223  * Same as irq_set_affinity, but without checking the mask against
224  * online cpus.
225  *
226  * Solely for low level cpu hotplug code, where we need to make per
227  * cpu interrupts affine before the cpu becomes online.
228  */
229 static inline int
230 irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
231 {
232         return __irq_set_affinity(irq, cpumask, true);
233 }
234 
235 extern int irq_can_set_affinity(unsigned int irq);
236 extern int irq_select_affinity(unsigned int irq);
237 
238 extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
239 
240 /**
241  * struct irq_affinity_notify - context for notification of IRQ affinity changes
242  * @irq:                Interrupt to which notification applies
243  * @kref:               Reference count, for internal use
244  * @work:               Work item, for internal use
245  * @notify:             Function to be called on change.  This will be
246  *                      called in process context.
247  * @release:            Function to be called on release.  This will be
248  *                      called in process context.  Once registered, the
249  *                      structure must only be freed when this function is
250  *                      called or later.
251  */
252 struct irq_affinity_notify {
253         unsigned int irq;
254         struct kref kref;
255         struct work_struct work;
256         void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
257         void (*release)(struct kref *ref);
258 };
259 
260 extern int
261 irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
262 
263 #else /* CONFIG_SMP */
264 
265 static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
266 {
267         return -EINVAL;
268 }
269 
270 static inline int irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
271 {
272         return 0;
273 }
274 
275 static inline int irq_can_set_affinity(unsigned int irq)
276 {
277         return 0;
278 }
279 
280 static inline int irq_select_affinity(unsigned int irq)  { return 0; }
281 
282 static inline int irq_set_affinity_hint(unsigned int irq,
283                                         const struct cpumask *m)
284 {
285         return -EINVAL;
286 }
287 #endif /* CONFIG_SMP */
288 
289 /*
290  * Special lockdep variants of irq disabling/enabling.
291  * These should be used for locking constructs that
292  * know that a particular irq context which is disabled,
293  * and which is the only irq-context user of a lock,
294  * that it's safe to take the lock in the irq-disabled
295  * section without disabling hardirqs.
296  *
297  * On !CONFIG_LOCKDEP they are equivalent to the normal
298  * irq disable/enable methods.
299  */
300 static inline void disable_irq_nosync_lockdep(unsigned int irq)
301 {
302         disable_irq_nosync(irq);
303 #ifdef CONFIG_LOCKDEP
304         local_irq_disable();
305 #endif
306 }
307 
308 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
309 {
310         disable_irq_nosync(irq);
311 #ifdef CONFIG_LOCKDEP
312         local_irq_save(*flags);
313 #endif
314 }
315 
316 static inline void disable_irq_lockdep(unsigned int irq)
317 {
318         disable_irq(irq);
319 #ifdef CONFIG_LOCKDEP
320         local_irq_disable();
321 #endif
322 }
323 
324 static inline void enable_irq_lockdep(unsigned int irq)
325 {
326 #ifdef CONFIG_LOCKDEP
327         local_irq_enable();
328 #endif
329         enable_irq(irq);
330 }
331 
332 static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
333 {
334 #ifdef CONFIG_LOCKDEP
335         local_irq_restore(*flags);
336 #endif
337         enable_irq(irq);
338 }
339 
340 /* IRQ wakeup (PM) control: */
341 extern int irq_set_irq_wake(unsigned int irq, unsigned int on);
342 
343 static inline int enable_irq_wake(unsigned int irq)
344 {
345         return irq_set_irq_wake(irq, 1);
346 }
347 
348 static inline int disable_irq_wake(unsigned int irq)
349 {
350         return irq_set_irq_wake(irq, 0);
351 }
352 
353 
354 #ifdef CONFIG_IRQ_FORCED_THREADING
355 extern bool force_irqthreads;
356 #else
357 #define force_irqthreads        (0)
358 #endif
359 
360 #ifndef __ARCH_SET_SOFTIRQ_PENDING
361 #define set_softirq_pending(x) (local_softirq_pending() = (x))
362 #define or_softirq_pending(x)  (local_softirq_pending() |= (x))
363 #endif
364 
365 /* Some architectures might implement lazy enabling/disabling of
366  * interrupts. In some cases, such as stop_machine, we might want
367  * to ensure that after a local_irq_disable(), interrupts have
368  * really been disabled in hardware. Such architectures need to
369  * implement the following hook.
370  */
371 #ifndef hard_irq_disable
372 #define hard_irq_disable()      do { } while(0)
373 #endif
374 
375 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
376    frequency threaded job scheduling. For almost all the purposes
377    tasklets are more than enough. F.e. all serial device BHs et
378    al. should be converted to tasklets, not to softirqs.
379  */
380 
381 enum
382 {
383         HI_SOFTIRQ=0,
384         TIMER_SOFTIRQ,
385         NET_TX_SOFTIRQ,
386         NET_RX_SOFTIRQ,
387         BLOCK_SOFTIRQ,
388         BLOCK_IOPOLL_SOFTIRQ,
389         TASKLET_SOFTIRQ,
390         SCHED_SOFTIRQ,
391         HRTIMER_SOFTIRQ,
392         RCU_SOFTIRQ,    /* Preferable RCU should always be the last softirq */
393 
394         NR_SOFTIRQS
395 };
396 
397 #define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ))
398 
399 /* map softirq index to softirq name. update 'softirq_to_name' in
400  * kernel/softirq.c when adding a new softirq.
401  */
402 extern char *softirq_to_name[NR_SOFTIRQS];
403 
404 /* softirq mask and active fields moved to irq_cpustat_t in
405  * asm/hardirq.h to get better cache usage.  KAO
406  */
407 
408 struct softirq_action
409 {
410         void    (*action)(struct softirq_action *);
411 };
412 
413 asmlinkage void do_softirq(void);
414 asmlinkage void __do_softirq(void);
415 extern void open_softirq(int nr, void (*action)(struct softirq_action *));
416 extern void softirq_init(void);
417 extern void __raise_softirq_irqoff(unsigned int nr);
418 
419 extern void raise_softirq_irqoff(unsigned int nr);
420 extern void raise_softirq(unsigned int nr);
421 
422 /* This is the worklist that queues up per-cpu softirq work.
423  *
424  * send_remote_sendirq() adds work to these lists, and
425  * the softirq handler itself dequeues from them.  The queues
426  * are protected by disabling local cpu interrupts and they must
427  * only be accessed by the local cpu that they are for.
428  */
429 DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list);
430 
431 DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
432 
433 static inline struct task_struct *this_cpu_ksoftirqd(void)
434 {
435         return this_cpu_read(ksoftirqd);
436 }
437 
438 /* Try to send a softirq to a remote cpu.  If this cannot be done, the
439  * work will be queued to the local cpu.
440  */
441 extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq);
442 
443 /* Like send_remote_softirq(), but the caller must disable local cpu interrupts
444  * and compute the current cpu, passed in as 'this_cpu'.
445  */
446 extern void __send_remote_softirq(struct call_single_data *cp, int cpu,
447                                   int this_cpu, int softirq);
448 
449 /* Tasklets --- multithreaded analogue of BHs.
450 
451    Main feature differing them of generic softirqs: tasklet
452    is running only on one CPU simultaneously.
453 
454    Main feature differing them of BHs: different tasklets
455    may be run simultaneously on different CPUs.
456 
457    Properties:
458    * If tasklet_schedule() is called, then tasklet is guaranteed
459      to be executed on some cpu at least once after this.
460    * If the tasklet is already scheduled, but its execution is still not
461      started, it will be executed only once.
462    * If this tasklet is already running on another CPU (or schedule is called
463      from tasklet itself), it is rescheduled for later.
464    * Tasklet is strictly serialized wrt itself, but not
465      wrt another tasklets. If client needs some intertask synchronization,
466      he makes it with spinlocks.
467  */
468 
469 struct tasklet_struct
470 {
471         struct tasklet_struct *next;
472         unsigned long state;
473         atomic_t count;
474         void (*func)(unsigned long);
475         unsigned long data;
476 };
477 
478 #define DECLARE_TASKLET(name, func, data) \
479 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
480 
481 #define DECLARE_TASKLET_DISABLED(name, func, data) \
482 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
483 
484 
485 enum
486 {
487         TASKLET_STATE_SCHED,    /* Tasklet is scheduled for execution */
488         TASKLET_STATE_RUN       /* Tasklet is running (SMP only) */
489 };
490 
491 #ifdef CONFIG_SMP
492 static inline int tasklet_trylock(struct tasklet_struct *t)
493 {
494         return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
495 }
496 
497 static inline void tasklet_unlock(struct tasklet_struct *t)
498 {
499         smp_mb__before_clear_bit(); 
500         clear_bit(TASKLET_STATE_RUN, &(t)->state);
501 }
502 
503 static inline void tasklet_unlock_wait(struct tasklet_struct *t)
504 {
505         while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
506 }
507 #else
508 #define tasklet_trylock(t) 1
509 #define tasklet_unlock_wait(t) do { } while (0)
510 #define tasklet_unlock(t) do { } while (0)
511 #endif
512 
513 extern void __tasklet_schedule(struct tasklet_struct *t);
514 
515 static inline void tasklet_schedule(struct tasklet_struct *t)
516 {
517         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
518                 __tasklet_schedule(t);
519 }
520 
521 extern void __tasklet_hi_schedule(struct tasklet_struct *t);
522 
523 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
524 {
525         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
526                 __tasklet_hi_schedule(t);
527 }
528 
529 extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
530 
531 /*
532  * This version avoids touching any other tasklets. Needed for kmemcheck
533  * in order not to take any page faults while enqueueing this tasklet;
534  * consider VERY carefully whether you really need this or
535  * tasklet_hi_schedule()...
536  */
537 static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
538 {
539         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
540                 __tasklet_hi_schedule_first(t);
541 }
542 
543 
544 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
545 {
546         atomic_inc(&t->count);
547         smp_mb__after_atomic_inc();
548 }
549 
550 static inline void tasklet_disable(struct tasklet_struct *t)
551 {
552         tasklet_disable_nosync(t);
553         tasklet_unlock_wait(t);
554         smp_mb();
555 }
556 
557 static inline void tasklet_enable(struct tasklet_struct *t)
558 {
559         smp_mb__before_atomic_dec();
560         atomic_dec(&t->count);
561 }
562 
563 static inline void tasklet_hi_enable(struct tasklet_struct *t)
564 {
565         smp_mb__before_atomic_dec();
566         atomic_dec(&t->count);
567 }
568 
569 extern void tasklet_kill(struct tasklet_struct *t);
570 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
571 extern void tasklet_init(struct tasklet_struct *t,
572                          void (*func)(unsigned long), unsigned long data);
573 
574 struct tasklet_hrtimer {
575         struct hrtimer          timer;
576         struct tasklet_struct   tasklet;
577         enum hrtimer_restart    (*function)(struct hrtimer *);
578 };
579 
580 extern void
581 tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
582                      enum hrtimer_restart (*function)(struct hrtimer *),
583                      clockid_t which_clock, enum hrtimer_mode mode);
584 
585 static inline
586 int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
587                           const enum hrtimer_mode mode)
588 {
589         return hrtimer_start(&ttimer->timer, time, mode);
590 }
591 
592 static inline
593 void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
594 {
595         hrtimer_cancel(&ttimer->timer);
596         tasklet_kill(&ttimer->tasklet);
597 }
598 
599 /*
600  * Autoprobing for irqs:
601  *
602  * probe_irq_on() and probe_irq_off() provide robust primitives
603  * for accurate IRQ probing during kernel initialization.  They are
604  * reasonably simple to use, are not "fooled" by spurious interrupts,
605  * and, unlike other attempts at IRQ probing, they do not get hung on
606  * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
607  *
608  * For reasonably foolproof probing, use them as follows:
609  *
610  * 1. clear and/or mask the device's internal interrupt.
611  * 2. sti();
612  * 3. irqs = probe_irq_on();      // "take over" all unassigned idle IRQs
613  * 4. enable the device and cause it to trigger an interrupt.
614  * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
615  * 6. irq = probe_irq_off(irqs);  // get IRQ number, 0=none, negative=multiple
616  * 7. service the device to clear its pending interrupt.
617  * 8. loop again if paranoia is required.
618  *
619  * probe_irq_on() returns a mask of allocated irq's.
620  *
621  * probe_irq_off() takes the mask as a parameter,
622  * and returns the irq number which occurred,
623  * or zero if none occurred, or a negative irq number
624  * if more than one irq occurred.
625  */
626 
627 #if !defined(CONFIG_GENERIC_IRQ_PROBE) 
628 static inline unsigned long probe_irq_on(void)
629 {
630         return 0;
631 }
632 static inline int probe_irq_off(unsigned long val)
633 {
634         return 0;
635 }
636 static inline unsigned int probe_irq_mask(unsigned long val)
637 {
638         return 0;
639 }
640 #else
641 extern unsigned long probe_irq_on(void);        /* returns 0 on failure */
642 extern int probe_irq_off(unsigned long);        /* returns 0 or negative on failure */
643 extern unsigned int probe_irq_mask(unsigned long);      /* returns mask of ISA interrupts */
644 #endif
645 
646 #ifdef CONFIG_PROC_FS
647 /* Initialize /proc/irq/ */
648 extern void init_irq_proc(void);
649 #else
650 static inline void init_irq_proc(void)
651 {
652 }
653 #endif
654 
655 struct seq_file;
656 int show_interrupts(struct seq_file *p, void *v);
657 int arch_show_interrupts(struct seq_file *p, int prec);
658 
659 extern int early_irq_init(void);
660 extern int arch_probe_nr_irqs(void);
661 extern int arch_early_irq_init(void);
662 
663 #endif
664 

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