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Linux/include/linux/interrupt.h

  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/hrtimer.h>
 15 #include <linux/kref.h>
 16 #include <linux/workqueue.h>
 17 
 18 #include <linux/atomic.h>
 19 #include <asm/ptrace.h>
 20 #include <asm/irq.h>
 21 
 22 /*
 23  * These correspond to the IORESOURCE_IRQ_* defines in
 24  * linux/ioport.h to select the interrupt line behaviour.  When
 25  * requesting an interrupt without specifying a IRQF_TRIGGER, the
 26  * setting should be assumed to be "as already configured", which
 27  * may be as per machine or firmware initialisation.
 28  */
 29 #define IRQF_TRIGGER_NONE       0x00000000
 30 #define IRQF_TRIGGER_RISING     0x00000001
 31 #define IRQF_TRIGGER_FALLING    0x00000002
 32 #define IRQF_TRIGGER_HIGH       0x00000004
 33 #define IRQF_TRIGGER_LOW        0x00000008
 34 #define IRQF_TRIGGER_MASK       (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW | \
 35                                  IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)
 36 #define IRQF_TRIGGER_PROBE      0x00000010
 37 
 38 /*
 39  * These flags used only by the kernel as part of the
 40  * irq handling routines.
 41  *
 42  * IRQF_SHARED - allow sharing the irq among several devices
 43  * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
 44  * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
 45  * IRQF_PERCPU - Interrupt is per cpu
 46  * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
 47  * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
 48  *                registered first in an shared interrupt is considered for
 49  *                performance reasons)
 50  * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished.
 51  *                Used by threaded interrupts which need to keep the
 52  *                irq line disabled until the threaded handler has been run.
 53  * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend.  Does not guarantee
 54  *                   that this interrupt will wake the system from a suspended
 55  *                   state.  See Documentation/power/suspend-and-interrupts.txt
 56  * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set
 57  * IRQF_NO_THREAD - Interrupt cannot be threaded
 58  * IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device
 59  *                resume time.
 60  * IRQF_COND_SUSPEND - If the IRQ is shared with a NO_SUSPEND user, execute this
 61  *                interrupt handler after suspending interrupts. For system
 62  *                wakeup devices users need to implement wakeup detection in
 63  *                their interrupt handlers.
 64  */
 65 #define IRQF_SHARED             0x00000080
 66 #define IRQF_PROBE_SHARED       0x00000100
 67 #define __IRQF_TIMER            0x00000200
 68 #define IRQF_PERCPU             0x00000400
 69 #define IRQF_NOBALANCING        0x00000800
 70 #define IRQF_IRQPOLL            0x00001000
 71 #define IRQF_ONESHOT            0x00002000
 72 #define IRQF_NO_SUSPEND         0x00004000
 73 #define IRQF_FORCE_RESUME       0x00008000
 74 #define IRQF_NO_THREAD          0x00010000
 75 #define IRQF_EARLY_RESUME       0x00020000
 76 #define IRQF_COND_SUSPEND       0x00040000
 77 
 78 #define IRQF_TIMER              (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
 79 
 80 /*
 81  * These values can be returned by request_any_context_irq() and
 82  * describe the context the interrupt will be run in.
 83  *
 84  * IRQC_IS_HARDIRQ - interrupt runs in hardirq context
 85  * IRQC_IS_NESTED - interrupt runs in a nested threaded context
 86  */
 87 enum {
 88         IRQC_IS_HARDIRQ = 0,
 89         IRQC_IS_NESTED,
 90 };
 91 
 92 typedef irqreturn_t (*irq_handler_t)(int, void *);
 93 
 94 /**
 95  * struct irqaction - per interrupt action descriptor
 96  * @handler:    interrupt handler function
 97  * @name:       name of the device
 98  * @dev_id:     cookie to identify the device
 99  * @percpu_dev_id:      cookie to identify the device
100  * @next:       pointer to the next irqaction for shared interrupts
101  * @irq:        interrupt number
102  * @flags:      flags (see IRQF_* above)
103  * @thread_fn:  interrupt handler function for threaded interrupts
104  * @thread:     thread pointer for threaded interrupts
105  * @thread_flags:       flags related to @thread
106  * @thread_mask:        bitmask for keeping track of @thread activity
107  * @dir:        pointer to the proc/irq/NN/name entry
108  */
109 struct irqaction {
110         irq_handler_t           handler;
111         void                    *dev_id;
112         void __percpu           *percpu_dev_id;
113         struct irqaction        *next;
114         irq_handler_t           thread_fn;
115         struct task_struct      *thread;
116         unsigned int            irq;
117         unsigned int            flags;
118         unsigned long           thread_flags;
119         unsigned long           thread_mask;
120         const char              *name;
121         struct proc_dir_entry   *dir;
122 } ____cacheline_internodealigned_in_smp;
123 
124 extern irqreturn_t no_action(int cpl, void *dev_id);
125 
126 extern int __must_check
127 request_threaded_irq(unsigned int irq, irq_handler_t handler,
128                      irq_handler_t thread_fn,
129                      unsigned long flags, const char *name, void *dev);
130 
131 static inline int __must_check
132 request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
133             const char *name, void *dev)
134 {
135         return request_threaded_irq(irq, handler, NULL, flags, name, dev);
136 }
137 
138 extern int __must_check
139 request_any_context_irq(unsigned int irq, irq_handler_t handler,
140                         unsigned long flags, const char *name, void *dev_id);
141 
142 extern int __must_check
143 request_percpu_irq(unsigned int irq, irq_handler_t handler,
144                    const char *devname, void __percpu *percpu_dev_id);
145 
146 extern void free_irq(unsigned int, void *);
147 extern void free_percpu_irq(unsigned int, void __percpu *);
148 
149 struct device;
150 
151 extern int __must_check
152 devm_request_threaded_irq(struct device *dev, unsigned int irq,
153                           irq_handler_t handler, irq_handler_t thread_fn,
154                           unsigned long irqflags, const char *devname,
155                           void *dev_id);
156 
157 static inline int __must_check
158 devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
159                  unsigned long irqflags, const char *devname, void *dev_id)
160 {
161         return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
162                                          devname, dev_id);
163 }
164 
165 extern int __must_check
166 devm_request_any_context_irq(struct device *dev, unsigned int irq,
167                  irq_handler_t handler, unsigned long irqflags,
168                  const char *devname, void *dev_id);
169 
170 extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
171 
172 /*
173  * On lockdep we dont want to enable hardirqs in hardirq
174  * context. Use local_irq_enable_in_hardirq() to annotate
175  * kernel code that has to do this nevertheless (pretty much
176  * the only valid case is for old/broken hardware that is
177  * insanely slow).
178  *
179  * NOTE: in theory this might break fragile code that relies
180  * on hardirq delivery - in practice we dont seem to have such
181  * places left. So the only effect should be slightly increased
182  * irqs-off latencies.
183  */
184 #ifdef CONFIG_LOCKDEP
185 # define local_irq_enable_in_hardirq()  do { } while (0)
186 #else
187 # define local_irq_enable_in_hardirq()  local_irq_enable()
188 #endif
189 
190 extern void disable_irq_nosync(unsigned int irq);
191 extern bool disable_hardirq(unsigned int irq);
192 extern void disable_irq(unsigned int irq);
193 extern void disable_percpu_irq(unsigned int irq);
194 extern void enable_irq(unsigned int irq);
195 extern void enable_percpu_irq(unsigned int irq, unsigned int type);
196 extern void irq_wake_thread(unsigned int irq, void *dev_id);
197 
198 /* The following three functions are for the core kernel use only. */
199 extern void suspend_device_irqs(void);
200 extern void resume_device_irqs(void);
201 
202 /**
203  * struct irq_affinity_notify - context for notification of IRQ affinity changes
204  * @irq:                Interrupt to which notification applies
205  * @kref:               Reference count, for internal use
206  * @work:               Work item, for internal use
207  * @notify:             Function to be called on change.  This will be
208  *                      called in process context.
209  * @release:            Function to be called on release.  This will be
210  *                      called in process context.  Once registered, the
211  *                      structure must only be freed when this function is
212  *                      called or later.
213  */
214 struct irq_affinity_notify {
215         unsigned int irq;
216         struct kref kref;
217         struct work_struct work;
218         void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
219         void (*release)(struct kref *ref);
220 };
221 
222 #if defined(CONFIG_SMP)
223 
224 extern cpumask_var_t irq_default_affinity;
225 
226 /* Internal implementation. Use the helpers below */
227 extern int __irq_set_affinity(unsigned int irq, const struct cpumask *cpumask,
228                               bool force);
229 
230 /**
231  * irq_set_affinity - Set the irq affinity of a given irq
232  * @irq:        Interrupt to set affinity
233  * @cpumask:    cpumask
234  *
235  * Fails if cpumask does not contain an online CPU
236  */
237 static inline int
238 irq_set_affinity(unsigned int irq, const struct cpumask *cpumask)
239 {
240         return __irq_set_affinity(irq, cpumask, false);
241 }
242 
243 /**
244  * irq_force_affinity - Force the irq affinity of a given irq
245  * @irq:        Interrupt to set affinity
246  * @cpumask:    cpumask
247  *
248  * Same as irq_set_affinity, but without checking the mask against
249  * online cpus.
250  *
251  * Solely for low level cpu hotplug code, where we need to make per
252  * cpu interrupts affine before the cpu becomes online.
253  */
254 static inline int
255 irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
256 {
257         return __irq_set_affinity(irq, cpumask, true);
258 }
259 
260 extern int irq_can_set_affinity(unsigned int irq);
261 extern int irq_select_affinity(unsigned int irq);
262 
263 extern int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m);
264 
265 extern int
266 irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify);
267 
268 #else /* CONFIG_SMP */
269 
270 static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
271 {
272         return -EINVAL;
273 }
274 
275 static inline int irq_force_affinity(unsigned int irq, const struct cpumask *cpumask)
276 {
277         return 0;
278 }
279 
280 static inline int irq_can_set_affinity(unsigned int irq)
281 {
282         return 0;
283 }
284 
285 static inline int irq_select_affinity(unsigned int irq)  { return 0; }
286 
287 static inline int irq_set_affinity_hint(unsigned int irq,
288                                         const struct cpumask *m)
289 {
290         return -EINVAL;
291 }
292 
293 static inline int
294 irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
295 {
296         return 0;
297 }
298 #endif /* CONFIG_SMP */
299 
300 /*
301  * Special lockdep variants of irq disabling/enabling.
302  * These should be used for locking constructs that
303  * know that a particular irq context which is disabled,
304  * and which is the only irq-context user of a lock,
305  * that it's safe to take the lock in the irq-disabled
306  * section without disabling hardirqs.
307  *
308  * On !CONFIG_LOCKDEP they are equivalent to the normal
309  * irq disable/enable methods.
310  */
311 static inline void disable_irq_nosync_lockdep(unsigned int irq)
312 {
313         disable_irq_nosync(irq);
314 #ifdef CONFIG_LOCKDEP
315         local_irq_disable();
316 #endif
317 }
318 
319 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
320 {
321         disable_irq_nosync(irq);
322 #ifdef CONFIG_LOCKDEP
323         local_irq_save(*flags);
324 #endif
325 }
326 
327 static inline void disable_irq_lockdep(unsigned int irq)
328 {
329         disable_irq(irq);
330 #ifdef CONFIG_LOCKDEP
331         local_irq_disable();
332 #endif
333 }
334 
335 static inline void enable_irq_lockdep(unsigned int irq)
336 {
337 #ifdef CONFIG_LOCKDEP
338         local_irq_enable();
339 #endif
340         enable_irq(irq);
341 }
342 
343 static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
344 {
345 #ifdef CONFIG_LOCKDEP
346         local_irq_restore(*flags);
347 #endif
348         enable_irq(irq);
349 }
350 
351 /* IRQ wakeup (PM) control: */
352 extern int irq_set_irq_wake(unsigned int irq, unsigned int on);
353 
354 static inline int enable_irq_wake(unsigned int irq)
355 {
356         return irq_set_irq_wake(irq, 1);
357 }
358 
359 static inline int disable_irq_wake(unsigned int irq)
360 {
361         return irq_set_irq_wake(irq, 0);
362 }
363 
364 /*
365  * irq_get_irqchip_state/irq_set_irqchip_state specific flags
366  */
367 enum irqchip_irq_state {
368         IRQCHIP_STATE_PENDING,          /* Is interrupt pending? */
369         IRQCHIP_STATE_ACTIVE,           /* Is interrupt in progress? */
370         IRQCHIP_STATE_MASKED,           /* Is interrupt masked? */
371         IRQCHIP_STATE_LINE_LEVEL,       /* Is IRQ line high? */
372 };
373 
374 extern int irq_get_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
375                                  bool *state);
376 extern int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
377                                  bool state);
378 
379 #ifdef CONFIG_IRQ_FORCED_THREADING
380 extern bool force_irqthreads;
381 #else
382 #define force_irqthreads        (0)
383 #endif
384 
385 #ifndef __ARCH_SET_SOFTIRQ_PENDING
386 #define set_softirq_pending(x) (local_softirq_pending() = (x))
387 #define or_softirq_pending(x)  (local_softirq_pending() |= (x))
388 #endif
389 
390 /* Some architectures might implement lazy enabling/disabling of
391  * interrupts. In some cases, such as stop_machine, we might want
392  * to ensure that after a local_irq_disable(), interrupts have
393  * really been disabled in hardware. Such architectures need to
394  * implement the following hook.
395  */
396 #ifndef hard_irq_disable
397 #define hard_irq_disable()      do { } while(0)
398 #endif
399 
400 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
401    frequency threaded job scheduling. For almost all the purposes
402    tasklets are more than enough. F.e. all serial device BHs et
403    al. should be converted to tasklets, not to softirqs.
404  */
405 
406 enum
407 {
408         HI_SOFTIRQ=0,
409         TIMER_SOFTIRQ,
410         NET_TX_SOFTIRQ,
411         NET_RX_SOFTIRQ,
412         BLOCK_SOFTIRQ,
413         BLOCK_IOPOLL_SOFTIRQ,
414         TASKLET_SOFTIRQ,
415         SCHED_SOFTIRQ,
416         HRTIMER_SOFTIRQ,
417         RCU_SOFTIRQ,    /* Preferable RCU should always be the last softirq */
418 
419         NR_SOFTIRQS
420 };
421 
422 #define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ))
423 
424 /* map softirq index to softirq name. update 'softirq_to_name' in
425  * kernel/softirq.c when adding a new softirq.
426  */
427 extern const char * const softirq_to_name[NR_SOFTIRQS];
428 
429 /* softirq mask and active fields moved to irq_cpustat_t in
430  * asm/hardirq.h to get better cache usage.  KAO
431  */
432 
433 struct softirq_action
434 {
435         void    (*action)(struct softirq_action *);
436 };
437 
438 asmlinkage void do_softirq(void);
439 asmlinkage void __do_softirq(void);
440 
441 #ifdef __ARCH_HAS_DO_SOFTIRQ
442 void do_softirq_own_stack(void);
443 #else
444 static inline void do_softirq_own_stack(void)
445 {
446         __do_softirq();
447 }
448 #endif
449 
450 extern void open_softirq(int nr, void (*action)(struct softirq_action *));
451 extern void softirq_init(void);
452 extern void __raise_softirq_irqoff(unsigned int nr);
453 
454 extern void raise_softirq_irqoff(unsigned int nr);
455 extern void raise_softirq(unsigned int nr);
456 
457 DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
458 
459 static inline struct task_struct *this_cpu_ksoftirqd(void)
460 {
461         return this_cpu_read(ksoftirqd);
462 }
463 
464 /* Tasklets --- multithreaded analogue of BHs.
465 
466    Main feature differing them of generic softirqs: tasklet
467    is running only on one CPU simultaneously.
468 
469    Main feature differing them of BHs: different tasklets
470    may be run simultaneously on different CPUs.
471 
472    Properties:
473    * If tasklet_schedule() is called, then tasklet is guaranteed
474      to be executed on some cpu at least once after this.
475    * If the tasklet is already scheduled, but its execution is still not
476      started, it will be executed only once.
477    * If this tasklet is already running on another CPU (or schedule is called
478      from tasklet itself), it is rescheduled for later.
479    * Tasklet is strictly serialized wrt itself, but not
480      wrt another tasklets. If client needs some intertask synchronization,
481      he makes it with spinlocks.
482  */
483 
484 struct tasklet_struct
485 {
486         struct tasklet_struct *next;
487         unsigned long state;
488         atomic_t count;
489         void (*func)(unsigned long);
490         unsigned long data;
491 };
492 
493 #define DECLARE_TASKLET(name, func, data) \
494 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
495 
496 #define DECLARE_TASKLET_DISABLED(name, func, data) \
497 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
498 
499 
500 enum
501 {
502         TASKLET_STATE_SCHED,    /* Tasklet is scheduled for execution */
503         TASKLET_STATE_RUN       /* Tasklet is running (SMP only) */
504 };
505 
506 #ifdef CONFIG_SMP
507 static inline int tasklet_trylock(struct tasklet_struct *t)
508 {
509         return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
510 }
511 
512 static inline void tasklet_unlock(struct tasklet_struct *t)
513 {
514         smp_mb__before_atomic();
515         clear_bit(TASKLET_STATE_RUN, &(t)->state);
516 }
517 
518 static inline void tasklet_unlock_wait(struct tasklet_struct *t)
519 {
520         while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
521 }
522 #else
523 #define tasklet_trylock(t) 1
524 #define tasklet_unlock_wait(t) do { } while (0)
525 #define tasklet_unlock(t) do { } while (0)
526 #endif
527 
528 extern void __tasklet_schedule(struct tasklet_struct *t);
529 
530 static inline void tasklet_schedule(struct tasklet_struct *t)
531 {
532         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
533                 __tasklet_schedule(t);
534 }
535 
536 extern void __tasklet_hi_schedule(struct tasklet_struct *t);
537 
538 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
539 {
540         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
541                 __tasklet_hi_schedule(t);
542 }
543 
544 extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
545 
546 /*
547  * This version avoids touching any other tasklets. Needed for kmemcheck
548  * in order not to take any page faults while enqueueing this tasklet;
549  * consider VERY carefully whether you really need this or
550  * tasklet_hi_schedule()...
551  */
552 static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
553 {
554         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
555                 __tasklet_hi_schedule_first(t);
556 }
557 
558 
559 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
560 {
561         atomic_inc(&t->count);
562         smp_mb__after_atomic();
563 }
564 
565 static inline void tasklet_disable(struct tasklet_struct *t)
566 {
567         tasklet_disable_nosync(t);
568         tasklet_unlock_wait(t);
569         smp_mb();
570 }
571 
572 static inline void tasklet_enable(struct tasklet_struct *t)
573 {
574         smp_mb__before_atomic();
575         atomic_dec(&t->count);
576 }
577 
578 extern void tasklet_kill(struct tasklet_struct *t);
579 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
580 extern void tasklet_init(struct tasklet_struct *t,
581                          void (*func)(unsigned long), unsigned long data);
582 
583 struct tasklet_hrtimer {
584         struct hrtimer          timer;
585         struct tasklet_struct   tasklet;
586         enum hrtimer_restart    (*function)(struct hrtimer *);
587 };
588 
589 extern void
590 tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
591                      enum hrtimer_restart (*function)(struct hrtimer *),
592                      clockid_t which_clock, enum hrtimer_mode mode);
593 
594 static inline
595 int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
596                           const enum hrtimer_mode mode)
597 {
598         return hrtimer_start(&ttimer->timer, time, mode);
599 }
600 
601 static inline
602 void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
603 {
604         hrtimer_cancel(&ttimer->timer);
605         tasklet_kill(&ttimer->tasklet);
606 }
607 
608 /*
609  * Autoprobing for irqs:
610  *
611  * probe_irq_on() and probe_irq_off() provide robust primitives
612  * for accurate IRQ probing during kernel initialization.  They are
613  * reasonably simple to use, are not "fooled" by spurious interrupts,
614  * and, unlike other attempts at IRQ probing, they do not get hung on
615  * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
616  *
617  * For reasonably foolproof probing, use them as follows:
618  *
619  * 1. clear and/or mask the device's internal interrupt.
620  * 2. sti();
621  * 3. irqs = probe_irq_on();      // "take over" all unassigned idle IRQs
622  * 4. enable the device and cause it to trigger an interrupt.
623  * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
624  * 6. irq = probe_irq_off(irqs);  // get IRQ number, 0=none, negative=multiple
625  * 7. service the device to clear its pending interrupt.
626  * 8. loop again if paranoia is required.
627  *
628  * probe_irq_on() returns a mask of allocated irq's.
629  *
630  * probe_irq_off() takes the mask as a parameter,
631  * and returns the irq number which occurred,
632  * or zero if none occurred, or a negative irq number
633  * if more than one irq occurred.
634  */
635 
636 #if !defined(CONFIG_GENERIC_IRQ_PROBE) 
637 static inline unsigned long probe_irq_on(void)
638 {
639         return 0;
640 }
641 static inline int probe_irq_off(unsigned long val)
642 {
643         return 0;
644 }
645 static inline unsigned int probe_irq_mask(unsigned long val)
646 {
647         return 0;
648 }
649 #else
650 extern unsigned long probe_irq_on(void);        /* returns 0 on failure */
651 extern int probe_irq_off(unsigned long);        /* returns 0 or negative on failure */
652 extern unsigned int probe_irq_mask(unsigned long);      /* returns mask of ISA interrupts */
653 #endif
654 
655 #ifdef CONFIG_PROC_FS
656 /* Initialize /proc/irq/ */
657 extern void init_irq_proc(void);
658 #else
659 static inline void init_irq_proc(void)
660 {
661 }
662 #endif
663 
664 struct seq_file;
665 int show_interrupts(struct seq_file *p, void *v);
666 int arch_show_interrupts(struct seq_file *p, int prec);
667 
668 extern int early_irq_init(void);
669 extern int arch_probe_nr_irqs(void);
670 extern int arch_early_irq_init(void);
671 
672 #endif
673 

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