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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_DISABLED - keep irqs disabled when calling the action handler.
 43  *                 DEPRECATED. This flag is a NOOP and scheduled to be removed
 44  * IRQF_SHARED - allow sharing the irq among several devices
 45  * IRQF_PROBE_SHARED - set by callers when they expect sharing mismatches to occur
 46  * IRQF_TIMER - Flag to mark this interrupt as timer interrupt
 47  * IRQF_PERCPU - Interrupt is per cpu
 48  * IRQF_NOBALANCING - Flag to exclude this interrupt from irq balancing
 49  * IRQF_IRQPOLL - Interrupt is used for polling (only the interrupt that is
 50  *                registered first in an shared interrupt is considered for
 51  *                performance reasons)
 52  * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler finished.
 53  *                Used by threaded interrupts which need to keep the
 54  *                irq line disabled until the threaded handler has been run.
 55  * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend
 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  */
 61 #define IRQF_DISABLED           0x00000020
 62 #define IRQF_SHARED             0x00000080
 63 #define IRQF_PROBE_SHARED       0x00000100
 64 #define __IRQF_TIMER            0x00000200
 65 #define IRQF_PERCPU             0x00000400
 66 #define IRQF_NOBALANCING        0x00000800
 67 #define IRQF_IRQPOLL            0x00001000
 68 #define IRQF_ONESHOT            0x00002000
 69 #define IRQF_NO_SUSPEND         0x00004000
 70 #define IRQF_FORCE_RESUME       0x00008000
 71 #define IRQF_NO_THREAD          0x00010000
 72 #define IRQF_EARLY_RESUME       0x00020000
 73 
 74 #define IRQF_TIMER              (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
 75 
 76 /*
 77  * These values can be returned by request_any_context_irq() and
 78  * describe the context the interrupt will be run in.
 79  *
 80  * IRQC_IS_HARDIRQ - interrupt runs in hardirq context
 81  * IRQC_IS_NESTED - interrupt runs in a nested threaded context
 82  */
 83 enum {
 84         IRQC_IS_HARDIRQ = 0,
 85         IRQC_IS_NESTED,
 86 };
 87 
 88 typedef irqreturn_t (*irq_handler_t)(int, void *);
 89 
 90 /**
 91  * struct irqaction - per interrupt action descriptor
 92  * @handler:    interrupt handler function
 93  * @name:       name of the device
 94  * @dev_id:     cookie to identify the device
 95  * @percpu_dev_id:      cookie to identify the device
 96  * @next:       pointer to the next irqaction for shared interrupts
 97  * @irq:        interrupt number
 98  * @flags:      flags (see IRQF_* above)
 99  * @thread_fn:  interrupt handler function for threaded interrupts
100  * @thread:     thread pointer for threaded interrupts
101  * @thread_flags:       flags related to @thread
102  * @thread_mask:        bitmask for keeping track of @thread activity
103  * @dir:        pointer to the proc/irq/NN/name entry
104  */
105 struct irqaction {
106         irq_handler_t           handler;
107         void                    *dev_id;
108         void __percpu           *percpu_dev_id;
109         struct irqaction        *next;
110         irq_handler_t           thread_fn;
111         struct task_struct      *thread;
112         unsigned int            irq;
113         unsigned int            flags;
114         unsigned long           thread_flags;
115         unsigned long           thread_mask;
116         const char              *name;
117         struct proc_dir_entry   *dir;
118 } ____cacheline_internodealigned_in_smp;
119 
120 extern irqreturn_t no_action(int cpl, void *dev_id);
121 
122 extern int __must_check
123 request_threaded_irq(unsigned int irq, irq_handler_t handler,
124                      irq_handler_t thread_fn,
125                      unsigned long flags, const char *name, void *dev);
126 
127 static inline int __must_check
128 request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
129             const char *name, void *dev)
130 {
131         return request_threaded_irq(irq, handler, NULL, flags, name, dev);
132 }
133 
134 extern int __must_check
135 request_any_context_irq(unsigned int irq, irq_handler_t handler,
136                         unsigned long flags, const char *name, void *dev_id);
137 
138 extern int __must_check
139 request_percpu_irq(unsigned int irq, irq_handler_t handler,
140                    const char *devname, void __percpu *percpu_dev_id);
141 
142 extern void free_irq(unsigned int, void *);
143 extern void free_percpu_irq(unsigned int, void __percpu *);
144 
145 struct device;
146 
147 extern int __must_check
148 devm_request_threaded_irq(struct device *dev, unsigned int irq,
149                           irq_handler_t handler, irq_handler_t thread_fn,
150                           unsigned long irqflags, const char *devname,
151                           void *dev_id);
152 
153 static inline int __must_check
154 devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
155                  unsigned long irqflags, const char *devname, void *dev_id)
156 {
157         return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
158                                          devname, dev_id);
159 }
160 
161 extern int __must_check
162 devm_request_any_context_irq(struct device *dev, unsigned int irq,
163                  irq_handler_t handler, unsigned long irqflags,
164                  const char *devname, void *dev_id);
165 
166 extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
167 
168 /*
169  * On lockdep we dont want to enable hardirqs in hardirq
170  * context. Use local_irq_enable_in_hardirq() to annotate
171  * kernel code that has to do this nevertheless (pretty much
172  * the only valid case is for old/broken hardware that is
173  * insanely slow).
174  *
175  * NOTE: in theory this might break fragile code that relies
176  * on hardirq delivery - in practice we dont seem to have such
177  * places left. So the only effect should be slightly increased
178  * irqs-off latencies.
179  */
180 #ifdef CONFIG_LOCKDEP
181 # define local_irq_enable_in_hardirq()  do { } while (0)
182 #else
183 # define local_irq_enable_in_hardirq()  local_irq_enable()
184 #endif
185 
186 extern void disable_irq_nosync(unsigned int irq);
187 extern void disable_irq(unsigned int irq);
188 extern void disable_percpu_irq(unsigned int irq);
189 extern void enable_irq(unsigned int irq);
190 extern void enable_percpu_irq(unsigned int irq, unsigned int type);
191 extern void irq_wake_thread(unsigned int irq, void *dev_id);
192 
193 /* The following three functions are for the core kernel use only. */
194 extern void suspend_device_irqs(void);
195 extern void resume_device_irqs(void);
196 #ifdef CONFIG_PM_SLEEP
197 extern int check_wakeup_irqs(void);
198 #else
199 static inline int check_wakeup_irqs(void) { return 0; }
200 #endif
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 #ifdef CONFIG_IRQ_FORCED_THREADING
366 extern bool force_irqthreads;
367 #else
368 #define force_irqthreads        (0)
369 #endif
370 
371 #ifndef __ARCH_SET_SOFTIRQ_PENDING
372 #define set_softirq_pending(x) (local_softirq_pending() = (x))
373 #define or_softirq_pending(x)  (local_softirq_pending() |= (x))
374 #endif
375 
376 /* Some architectures might implement lazy enabling/disabling of
377  * interrupts. In some cases, such as stop_machine, we might want
378  * to ensure that after a local_irq_disable(), interrupts have
379  * really been disabled in hardware. Such architectures need to
380  * implement the following hook.
381  */
382 #ifndef hard_irq_disable
383 #define hard_irq_disable()      do { } while(0)
384 #endif
385 
386 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
387    frequency threaded job scheduling. For almost all the purposes
388    tasklets are more than enough. F.e. all serial device BHs et
389    al. should be converted to tasklets, not to softirqs.
390  */
391 
392 enum
393 {
394         HI_SOFTIRQ=0,
395         TIMER_SOFTIRQ,
396         NET_TX_SOFTIRQ,
397         NET_RX_SOFTIRQ,
398         BLOCK_SOFTIRQ,
399         BLOCK_IOPOLL_SOFTIRQ,
400         TASKLET_SOFTIRQ,
401         SCHED_SOFTIRQ,
402         HRTIMER_SOFTIRQ,
403         RCU_SOFTIRQ,    /* Preferable RCU should always be the last softirq */
404 
405         NR_SOFTIRQS
406 };
407 
408 #define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ))
409 
410 /* map softirq index to softirq name. update 'softirq_to_name' in
411  * kernel/softirq.c when adding a new softirq.
412  */
413 extern const char * const softirq_to_name[NR_SOFTIRQS];
414 
415 /* softirq mask and active fields moved to irq_cpustat_t in
416  * asm/hardirq.h to get better cache usage.  KAO
417  */
418 
419 struct softirq_action
420 {
421         void    (*action)(struct softirq_action *);
422 };
423 
424 asmlinkage void do_softirq(void);
425 asmlinkage void __do_softirq(void);
426 
427 #ifdef __ARCH_HAS_DO_SOFTIRQ
428 void do_softirq_own_stack(void);
429 #else
430 static inline void do_softirq_own_stack(void)
431 {
432         __do_softirq();
433 }
434 #endif
435 
436 extern void open_softirq(int nr, void (*action)(struct softirq_action *));
437 extern void softirq_init(void);
438 extern void __raise_softirq_irqoff(unsigned int nr);
439 
440 extern void raise_softirq_irqoff(unsigned int nr);
441 extern void raise_softirq(unsigned int nr);
442 
443 DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
444 
445 static inline struct task_struct *this_cpu_ksoftirqd(void)
446 {
447         return this_cpu_read(ksoftirqd);
448 }
449 
450 /* Tasklets --- multithreaded analogue of BHs.
451 
452    Main feature differing them of generic softirqs: tasklet
453    is running only on one CPU simultaneously.
454 
455    Main feature differing them of BHs: different tasklets
456    may be run simultaneously on different CPUs.
457 
458    Properties:
459    * If tasklet_schedule() is called, then tasklet is guaranteed
460      to be executed on some cpu at least once after this.
461    * If the tasklet is already scheduled, but its execution is still not
462      started, it will be executed only once.
463    * If this tasklet is already running on another CPU (or schedule is called
464      from tasklet itself), it is rescheduled for later.
465    * Tasklet is strictly serialized wrt itself, but not
466      wrt another tasklets. If client needs some intertask synchronization,
467      he makes it with spinlocks.
468  */
469 
470 struct tasklet_struct
471 {
472         struct tasklet_struct *next;
473         unsigned long state;
474         atomic_t count;
475         void (*func)(unsigned long);
476         unsigned long data;
477 };
478 
479 #define DECLARE_TASKLET(name, func, data) \
480 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
481 
482 #define DECLARE_TASKLET_DISABLED(name, func, data) \
483 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
484 
485 
486 enum
487 {
488         TASKLET_STATE_SCHED,    /* Tasklet is scheduled for execution */
489         TASKLET_STATE_RUN       /* Tasklet is running (SMP only) */
490 };
491 
492 #ifdef CONFIG_SMP
493 static inline int tasklet_trylock(struct tasklet_struct *t)
494 {
495         return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
496 }
497 
498 static inline void tasklet_unlock(struct tasklet_struct *t)
499 {
500         smp_mb__before_atomic();
501         clear_bit(TASKLET_STATE_RUN, &(t)->state);
502 }
503 
504 static inline void tasklet_unlock_wait(struct tasklet_struct *t)
505 {
506         while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
507 }
508 #else
509 #define tasklet_trylock(t) 1
510 #define tasklet_unlock_wait(t) do { } while (0)
511 #define tasklet_unlock(t) do { } while (0)
512 #endif
513 
514 extern void __tasklet_schedule(struct tasklet_struct *t);
515 
516 static inline void tasklet_schedule(struct tasklet_struct *t)
517 {
518         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
519                 __tasklet_schedule(t);
520 }
521 
522 extern void __tasklet_hi_schedule(struct tasklet_struct *t);
523 
524 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
525 {
526         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
527                 __tasklet_hi_schedule(t);
528 }
529 
530 extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
531 
532 /*
533  * This version avoids touching any other tasklets. Needed for kmemcheck
534  * in order not to take any page faults while enqueueing this tasklet;
535  * consider VERY carefully whether you really need this or
536  * tasklet_hi_schedule()...
537  */
538 static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
539 {
540         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
541                 __tasklet_hi_schedule_first(t);
542 }
543 
544 
545 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
546 {
547         atomic_inc(&t->count);
548         smp_mb__after_atomic();
549 }
550 
551 static inline void tasklet_disable(struct tasklet_struct *t)
552 {
553         tasklet_disable_nosync(t);
554         tasklet_unlock_wait(t);
555         smp_mb();
556 }
557 
558 static inline void tasklet_enable(struct tasklet_struct *t)
559 {
560         smp_mb__before_atomic();
561         atomic_dec(&t->count);
562 }
563 
564 static inline void tasklet_hi_enable(struct tasklet_struct *t)
565 {
566         smp_mb__before_atomic();
567         atomic_dec(&t->count);
568 }
569 
570 extern void tasklet_kill(struct tasklet_struct *t);
571 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
572 extern void tasklet_init(struct tasklet_struct *t,
573                          void (*func)(unsigned long), unsigned long data);
574 
575 struct tasklet_hrtimer {
576         struct hrtimer          timer;
577         struct tasklet_struct   tasklet;
578         enum hrtimer_restart    (*function)(struct hrtimer *);
579 };
580 
581 extern void
582 tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
583                      enum hrtimer_restart (*function)(struct hrtimer *),
584                      clockid_t which_clock, enum hrtimer_mode mode);
585 
586 static inline
587 int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
588                           const enum hrtimer_mode mode)
589 {
590         return hrtimer_start(&ttimer->timer, time, mode);
591 }
592 
593 static inline
594 void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
595 {
596         hrtimer_cancel(&ttimer->timer);
597         tasklet_kill(&ttimer->tasklet);
598 }
599 
600 /*
601  * Autoprobing for irqs:
602  *
603  * probe_irq_on() and probe_irq_off() provide robust primitives
604  * for accurate IRQ probing during kernel initialization.  They are
605  * reasonably simple to use, are not "fooled" by spurious interrupts,
606  * and, unlike other attempts at IRQ probing, they do not get hung on
607  * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
608  *
609  * For reasonably foolproof probing, use them as follows:
610  *
611  * 1. clear and/or mask the device's internal interrupt.
612  * 2. sti();
613  * 3. irqs = probe_irq_on();      // "take over" all unassigned idle IRQs
614  * 4. enable the device and cause it to trigger an interrupt.
615  * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
616  * 6. irq = probe_irq_off(irqs);  // get IRQ number, 0=none, negative=multiple
617  * 7. service the device to clear its pending interrupt.
618  * 8. loop again if paranoia is required.
619  *
620  * probe_irq_on() returns a mask of allocated irq's.
621  *
622  * probe_irq_off() takes the mask as a parameter,
623  * and returns the irq number which occurred,
624  * or zero if none occurred, or a negative irq number
625  * if more than one irq occurred.
626  */
627 
628 #if !defined(CONFIG_GENERIC_IRQ_PROBE) 
629 static inline unsigned long probe_irq_on(void)
630 {
631         return 0;
632 }
633 static inline int probe_irq_off(unsigned long val)
634 {
635         return 0;
636 }
637 static inline unsigned int probe_irq_mask(unsigned long val)
638 {
639         return 0;
640 }
641 #else
642 extern unsigned long probe_irq_on(void);        /* returns 0 on failure */
643 extern int probe_irq_off(unsigned long);        /* returns 0 or negative on failure */
644 extern unsigned int probe_irq_mask(unsigned long);      /* returns mask of ISA interrupts */
645 #endif
646 
647 #ifdef CONFIG_PROC_FS
648 /* Initialize /proc/irq/ */
649 extern void init_irq_proc(void);
650 #else
651 static inline void init_irq_proc(void)
652 {
653 }
654 #endif
655 
656 struct seq_file;
657 int show_interrupts(struct seq_file *p, void *v);
658 int arch_show_interrupts(struct seq_file *p, int prec);
659 
660 extern int early_irq_init(void);
661 extern int arch_probe_nr_irqs(void);
662 extern int arch_early_irq_init(void);
663 
664 #endif
665 

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