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/smp.h>
  15 #include <linux/percpu.h>
  16 #include <linux/hrtimer.h>
  17
  18 #include <asm/atomic.h>
  19 #include <asm/ptrace.h>
  20 #include <asm/system.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  * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator
  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  */
  56 #define IRQF_DISABLED           0x00000020
  57 #define IRQF_SAMPLE_RANDOM      0x00000040
  58 #define IRQF_SHARED             0x00000080
  59 #define IRQF_PROBE_SHARED       0x00000100
  60 #define IRQF_TIMER              0x00000200
  61 #define IRQF_PERCPU             0x00000400
  62 #define IRQF_NOBALANCING        0x00000800
  63 #define IRQF_IRQPOLL            0x00001000
  64 #define IRQF_ONESHOT            0x00002000
  65
  66 /*
  67  * Bits used by threaded handlers:
  68  * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
  69  * IRQTF_DIED      - handler thread died
  70  * IRQTF_WARNED    - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
  71  * IRQTF_AFFINITY  - irq thread is requested to adjust affinity
  72  */
  73 enum {
  74         IRQTF_RUNTHREAD,
  75         IRQTF_DIED,
  76         IRQTF_WARNED,
  77         IRQTF_AFFINITY,
  78 };
  79
  80 typedef irqreturn_t (*irq_handler_t)(int, void *);
  81
  82 /**
  83  * struct irqaction - per interrupt action descriptor
  84  * @handler:    interrupt handler function
  85  * @flags:      flags (see IRQF_* above)
  86  * @name:       name of the device
  87  * @dev_id:     cookie to identify the device
  88  * @next:       pointer to the next irqaction for shared interrupts
  89  * @irq:        interrupt number
  90  * @dir:        pointer to the proc/irq/NN/name entry
  91  * @thread_fn:  interupt handler function for threaded interrupts
  92  * @thread:     thread pointer for threaded interrupts
  93  * @thread_flags:       flags related to @thread
  94  */
  95 struct irqaction {
  96         irq_handler_t handler;
  97         unsigned long flags;
  98         const char *name;
  99         void *dev_id;
 100         struct irqaction *next;
 101         int irq;
 102         struct proc_dir_entry *dir;
 103         irq_handler_t thread_fn;
 104         struct task_struct *thread;
 105         unsigned long thread_flags;
 106 };
 107
 108 extern irqreturn_t no_action(int cpl, void *dev_id);
 109
 110 #ifdef CONFIG_GENERIC_HARDIRQS
 111 extern int __must_check
 112 request_threaded_irq(unsigned int irq, irq_handler_t handler,
 113                      irq_handler_t thread_fn,
 114                      unsigned long flags, const char *name, void *dev);
 115
 116 static inline int __must_check
 117 request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
 118             const char *name, void *dev)
 119 {
 120         return request_threaded_irq(irq, handler, NULL, flags, name, dev);
 121 }
 122
 123 extern void exit_irq_thread(void);
 124 #else
 125
 126 extern int __must_check
 127 request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
 128             const char *name, void *dev);
 129
 130 /*
 131  * Special function to avoid ifdeffery in kernel/irq/devres.c which
 132  * gets magically built by GENERIC_HARDIRQS=n architectures (sparc,
 133  * m68k). I really love these $@%#!* obvious Makefile references:
 134  * ../../../kernel/irq/devres.o
 135  */
 136 static inline int __must_check
 137 request_threaded_irq(unsigned int irq, irq_handler_t handler,
 138                      irq_handler_t thread_fn,
 139                      unsigned long flags, const char *name, void *dev)
 140 {
 141         return request_irq(irq, handler, flags, name, dev);
 142 }
 143
 144 static inline void exit_irq_thread(void) { }
 145 #endif
 146
 147 extern void free_irq(unsigned int, void *);
 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 void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
 166
 167 /*
 168  * On lockdep we dont want to enable hardirqs in hardirq
 169  * context. Use local_irq_enable_in_hardirq() to annotate
 170  * kernel code that has to do this nevertheless (pretty much
 171  * the only valid case is for old/broken hardware that is
 172  * insanely slow).
 173  *
 174  * NOTE: in theory this might break fragile code that relies
 175  * on hardirq delivery - in practice we dont seem to have such
 176  * places left. So the only effect should be slightly increased
 177  * irqs-off latencies.
 178  */
 179 #ifdef CONFIG_LOCKDEP
 180 # define local_irq_enable_in_hardirq()  do { } while (0)
 181 #else
 182 # define local_irq_enable_in_hardirq()  local_irq_enable()
 183 #endif
 184
 185 extern void disable_irq_nosync(unsigned int irq);
 186 extern void disable_irq(unsigned int irq);
 187 extern void enable_irq(unsigned int irq);
 188
 189 /* The following three functions are for the core kernel use only. */
 190 #ifdef CONFIG_GENERIC_HARDIRQS
 191 extern void suspend_device_irqs(void);
 192 extern void resume_device_irqs(void);
 193 #ifdef CONFIG_PM_SLEEP
 194 extern int check_wakeup_irqs(void);
 195 #else
 196 static inline int check_wakeup_irqs(void) { return 0; }
 197 #endif
 198 #else
 199 static inline void suspend_device_irqs(void) { };
 200 static inline void resume_device_irqs(void) { };
 201 static inline int check_wakeup_irqs(void) { return 0; }
 202 #endif
 203
 204 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
 205
 206 extern cpumask_var_t irq_default_affinity;
 207
 208 extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask);
 209 extern int irq_can_set_affinity(unsigned int irq);
 210 extern int irq_select_affinity(unsigned int irq);
 211
 212 #else /* CONFIG_SMP */
 213
 214 static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
 215 {
 216         return -EINVAL;
 217 }
 218
 219 static inline int irq_can_set_affinity(unsigned int irq)
 220 {
 221         return 0;
 222 }
 223
 224 static inline int irq_select_affinity(unsigned int irq)  { return 0; }
 225
 226 #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */
 227
 228 #ifdef CONFIG_GENERIC_HARDIRQS
 229 /*
 230  * Special lockdep variants of irq disabling/enabling.
 231  * These should be used for locking constructs that
 232  * know that a particular irq context which is disabled,
 233  * and which is the only irq-context user of a lock,
 234  * that it's safe to take the lock in the irq-disabled
 235  * section without disabling hardirqs.
 236  *
 237  * On !CONFIG_LOCKDEP they are equivalent to the normal
 238  * irq disable/enable methods.
 239  */
 240 static inline void disable_irq_nosync_lockdep(unsigned int irq)
 241 {
 242         disable_irq_nosync(irq);
 243 #ifdef CONFIG_LOCKDEP
 244         local_irq_disable();
 245 #endif
 246 }
 247
 248 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
 249 {
 250         disable_irq_nosync(irq);
 251 #ifdef CONFIG_LOCKDEP
 252         local_irq_save(*flags);
 253 #endif
 254 }
 255
 256 static inline void disable_irq_lockdep(unsigned int irq)
 257 {
 258         disable_irq(irq);
 259 #ifdef CONFIG_LOCKDEP
 260         local_irq_disable();
 261 #endif
 262 }
 263
 264 static inline void enable_irq_lockdep(unsigned int irq)
 265 {
 266 #ifdef CONFIG_LOCKDEP
 267         local_irq_enable();
 268 #endif
 269         enable_irq(irq);
 270 }
 271
 272 static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
 273 {
 274 #ifdef CONFIG_LOCKDEP
 275         local_irq_restore(*flags);
 276 #endif
 277         enable_irq(irq);
 278 }
 279
 280 /* IRQ wakeup (PM) control: */
 281 extern int set_irq_wake(unsigned int irq, unsigned int on);
 282
 283 static inline int enable_irq_wake(unsigned int irq)
 284 {
 285         return set_irq_wake(irq, 1);
 286 }
 287
 288 static inline int disable_irq_wake(unsigned int irq)
 289 {
 290         return set_irq_wake(irq, 0);
 291 }
 292
 293 #else /* !CONFIG_GENERIC_HARDIRQS */
 294 /*
 295  * NOTE: non-genirq architectures, if they want to support the lock
 296  * validator need to define the methods below in their asm/irq.h
 297  * files, under an #ifdef CONFIG_LOCKDEP section.
 298  */
 299 #ifndef CONFIG_LOCKDEP
 300 #  define disable_irq_nosync_lockdep(irq)       disable_irq_nosync(irq)
 301 #  define disable_irq_nosync_lockdep_irqsave(irq, flags) \
 302                                                 disable_irq_nosync(irq)
 303 #  define disable_irq_lockdep(irq)              disable_irq(irq)
 304 #  define enable_irq_lockdep(irq)               enable_irq(irq)
 305 #  define enable_irq_lockdep_irqrestore(irq, flags) \
 306                                                 enable_irq(irq)
 307 # endif
 308
 309 static inline int enable_irq_wake(unsigned int irq)
 310 {
 311         return 0;
 312 }
 313
 314 static inline int disable_irq_wake(unsigned int irq)
 315 {
 316         return 0;
 317 }
 318 #endif /* CONFIG_GENERIC_HARDIRQS */
 319
 320 #ifndef __ARCH_SET_SOFTIRQ_PENDING
 321 #define set_softirq_pending(x) (local_softirq_pending() = (x))
 322 #define or_softirq_pending(x)  (local_softirq_pending() |= (x))
 323 #endif
 324
 325 /* Some architectures might implement lazy enabling/disabling of
 326  * interrupts. In some cases, such as stop_machine, we might want
 327  * to ensure that after a local_irq_disable(), interrupts have
 328  * really been disabled in hardware. Such architectures need to
 329  * implement the following hook.
 330  */
 331 #ifndef hard_irq_disable
 332 #define hard_irq_disable()      do { } while(0)
 333 #endif
 334
 335 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
 336    frequency threaded job scheduling. For almost all the purposes
 337    tasklets are more than enough. F.e. all serial device BHs et
 338    al. should be converted to tasklets, not to softirqs.
 339  */
 340
 341 enum
 342 {
 343         HI_SOFTIRQ=0,
 344         TIMER_SOFTIRQ,
 345         NET_TX_SOFTIRQ,
 346         NET_RX_SOFTIRQ,
 347         BLOCK_SOFTIRQ,
 348         BLOCK_IOPOLL_SOFTIRQ,
 349         TASKLET_SOFTIRQ,
 350         SCHED_SOFTIRQ,
 351         HRTIMER_SOFTIRQ,
 352         RCU_SOFTIRQ,    /* Preferable RCU should always be the last softirq */
 353
 354         NR_SOFTIRQS
 355 };
 356
 357 /* map softirq index to softirq name. update 'softirq_to_name' in
 358  * kernel/softirq.c when adding a new softirq.
 359  */
 360 extern char *softirq_to_name[NR_SOFTIRQS];
 361
 362 /* softirq mask and active fields moved to irq_cpustat_t in
 363  * asm/hardirq.h to get better cache usage.  KAO
 364  */
 365
 366 struct softirq_action
 367 {
 368         void    (*action)(struct softirq_action *);
 369 };
 370
 371 asmlinkage void do_softirq(void);
 372 asmlinkage void __do_softirq(void);
 373 extern void open_softirq(int nr, void (*action)(struct softirq_action *));
 374 extern void softirq_init(void);
 375 #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
 376 extern void raise_softirq_irqoff(unsigned int nr);
 377 extern void raise_softirq(unsigned int nr);
 378 extern void wakeup_softirqd(void);
 379
 380 /* This is the worklist that queues up per-cpu softirq work.
 381  *
 382  * send_remote_sendirq() adds work to these lists, and
 383  * the softirq handler itself dequeues from them.  The queues
 384  * are protected by disabling local cpu interrupts and they must
 385  * only be accessed by the local cpu that they are for.
 386  */
 387 DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list);
 388
 389 /* Try to send a softirq to a remote cpu.  If this cannot be done, the
 390  * work will be queued to the local cpu.
 391  */
 392 extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq);
 393
 394 /* Like send_remote_softirq(), but the caller must disable local cpu interrupts
 395  * and compute the current cpu, passed in as 'this_cpu'.
 396  */
 397 extern void __send_remote_softirq(struct call_single_data *cp, int cpu,
 398                                   int this_cpu, int softirq);
 399
 400 /* Tasklets --- multithreaded analogue of BHs.
 401
 402    Main feature differing them of generic softirqs: tasklet
 403    is running only on one CPU simultaneously.
 404
 405    Main feature differing them of BHs: different tasklets
 406    may be run simultaneously on different CPUs.
 407
 408    Properties:
 409    * If tasklet_schedule() is called, then tasklet is guaranteed
 410      to be executed on some cpu at least once after this.
 411    * If the tasklet is already scheduled, but its excecution is still not
 412      started, it will be executed only once.
 413    * If this tasklet is already running on another CPU (or schedule is called
 414      from tasklet itself), it is rescheduled for later.
 415    * Tasklet is strictly serialized wrt itself, but not
 416      wrt another tasklets. If client needs some intertask synchronization,
 417      he makes it with spinlocks.
 418  */
 419
 420 struct tasklet_struct
 421 {
 422         struct tasklet_struct *next;
 423         unsigned long state;
 424         atomic_t count;
 425         void (*func)(unsigned long);
 426         unsigned long data;
 427 };
 428
 429 #define DECLARE_TASKLET(name, func, data) \
 430 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
 431
 432 #define DECLARE_TASKLET_DISABLED(name, func, data) \
 433 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
 434
 435
 436 enum
 437 {
 438         TASKLET_STATE_SCHED,    /* Tasklet is scheduled for execution */
 439         TASKLET_STATE_RUN       /* Tasklet is running (SMP only) */
 440 };
 441
 442 #ifdef CONFIG_SMP
 443 static inline int tasklet_trylock(struct tasklet_struct *t)
 444 {
 445         return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
 446 }
 447
 448 static inline void tasklet_unlock(struct tasklet_struct *t)
 449 {
 450         smp_mb__before_clear_bit();
 451         clear_bit(TASKLET_STATE_RUN, &(t)->state);
 452 }
 453
 454 static inline void tasklet_unlock_wait(struct tasklet_struct *t)
 455 {
 456         while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
 457 }
 458 #else
 459 #define tasklet_trylock(t) 1
 460 #define tasklet_unlock_wait(t) do { } while (0)
 461 #define tasklet_unlock(t) do { } while (0)
 462 #endif
 463
 464 extern void __tasklet_schedule(struct tasklet_struct *t);
 465
 466 static inline void tasklet_schedule(struct tasklet_struct *t)
 467 {
 468         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
 469                 __tasklet_schedule(t);
 470 }
 471
 472 extern void __tasklet_hi_schedule(struct tasklet_struct *t);
 473
 474 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
 475 {
 476         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
 477                 __tasklet_hi_schedule(t);
 478 }
 479
 480 extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
 481
 482 /*
 483  * This version avoids touching any other tasklets. Needed for kmemcheck
 484  * in order not to take any page faults while enqueueing this tasklet;
 485  * consider VERY carefully whether you really need this or
 486  * tasklet_hi_schedule()...
 487  */
 488 static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
 489 {
 490         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
 491                 __tasklet_hi_schedule_first(t);
 492 }
 493
 494
 495 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
 496 {
 497         atomic_inc(&t->count);
 498         smp_mb__after_atomic_inc();
 499 }
 500
 501 static inline void tasklet_disable(struct tasklet_struct *t)
 502 {
 503         tasklet_disable_nosync(t);
 504         tasklet_unlock_wait(t);
 505         smp_mb();
 506 }
 507
 508 static inline void tasklet_enable(struct tasklet_struct *t)
 509 {
 510         smp_mb__before_atomic_dec();
 511         atomic_dec(&t->count);
 512 }
 513
 514 static inline void tasklet_hi_enable(struct tasklet_struct *t)
 515 {
 516         smp_mb__before_atomic_dec();
 517         atomic_dec(&t->count);
 518 }
 519
 520 extern void tasklet_kill(struct tasklet_struct *t);
 521 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
 522 extern void tasklet_init(struct tasklet_struct *t,
 523                          void (*func)(unsigned long), unsigned long data);
 524
 525 struct tasklet_hrtimer {
 526         struct hrtimer          timer;
 527         struct tasklet_struct   tasklet;
 528         enum hrtimer_restart    (*function)(struct hrtimer *);
 529 };
 530
 531 extern void
 532 tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
 533                      enum hrtimer_restart (*function)(struct hrtimer *),
 534                      clockid_t which_clock, enum hrtimer_mode mode);
 535
 536 static inline
 537 int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
 538                           const enum hrtimer_mode mode)
 539 {
 540         return hrtimer_start(&ttimer->timer, time, mode);
 541 }
 542
 543 static inline
 544 void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
 545 {
 546         hrtimer_cancel(&ttimer->timer);
 547         tasklet_kill(&ttimer->tasklet);
 548 }
 549
 550 /*
 551  * Autoprobing for irqs:
 552  *
 553  * probe_irq_on() and probe_irq_off() provide robust primitives
 554  * for accurate IRQ probing during kernel initialization.  They are
 555  * reasonably simple to use, are not "fooled" by spurious interrupts,
 556  * and, unlike other attempts at IRQ probing, they do not get hung on
 557  * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
 558  *
 559  * For reasonably foolproof probing, use them as follows:
 560  *
 561  * 1. clear and/or mask the device's internal interrupt.
 562  * 2. sti();
 563  * 3. irqs = probe_irq_on();      // "take over" all unassigned idle IRQs
 564  * 4. enable the device and cause it to trigger an interrupt.
 565  * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
 566  * 6. irq = probe_irq_off(irqs);  // get IRQ number, 0=none, negative=multiple
 567  * 7. service the device to clear its pending interrupt.
 568  * 8. loop again if paranoia is required.
 569  *
 570  * probe_irq_on() returns a mask of allocated irq's.
 571  *
 572  * probe_irq_off() takes the mask as a parameter,
 573  * and returns the irq number which occurred,
 574  * or zero if none occurred, or a negative irq number
 575  * if more than one irq occurred.
 576  */
 577
 578 #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
 579 static inline unsigned long probe_irq_on(void)
 580 {
 581         return 0;
 582 }
 583 static inline int probe_irq_off(unsigned long val)
 584 {
 585         return 0;
 586 }
 587 static inline unsigned int probe_irq_mask(unsigned long val)
 588 {
 589         return 0;
 590 }
 591 #else
 592 extern unsigned long probe_irq_on(void);        /* returns 0 on failure */
 593 extern int probe_irq_off(unsigned long);        /* returns 0 or negative on failure */
 594 extern unsigned int probe_irq_mask(unsigned long);      /* returns mask of ISA interrupts */
 595 #endif
 596
 597 #ifdef CONFIG_PROC_FS
 598 /* Initialize /proc/irq/ */
 599 extern void init_irq_proc(void);
 600 #else
 601 static inline void init_irq_proc(void)
 602 {
 603 }
 604 #endif
 605
 606 #if defined(CONFIG_GENERIC_HARDIRQS) && defined(CONFIG_DEBUG_SHIRQ)
 607 extern void debug_poll_all_shared_irqs(void);
 608 #else
 609 static inline void debug_poll_all_shared_irqs(void) { }
 610 #endif
 611
 612 struct seq_file;
 613 int show_interrupts(struct seq_file *p, void *v);
 614
 615 struct irq_desc;
 616
 617 extern int early_irq_init(void);
 618 extern int arch_probe_nr_irqs(void);
 619 extern int arch_early_irq_init(void);
 620 extern int arch_init_chip_data(struct irq_desc *desc, int node);
 621
 622 #endif