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/sched.h>
  14 #include <linux/irqflags.h>
  15 #include <linux/smp.h>
  16 #include <linux/percpu.h>
  17 #include <linux/hrtimer.h>
  18
  19 #include <asm/atomic.h>
  20 #include <asm/ptrace.h>
  21 #include <asm/system.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  * IRQF_SAMPLE_RANDOM - irq is used to feed the random generator
  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  */
  57 #define IRQF_DISABLED           0x00000020
  58 #define IRQF_SAMPLE_RANDOM      0x00000040
  59 #define IRQF_SHARED             0x00000080
  60 #define IRQF_PROBE_SHARED       0x00000100
  61 #define IRQF_TIMER              0x00000200
  62 #define IRQF_PERCPU             0x00000400
  63 #define IRQF_NOBALANCING        0x00000800
  64 #define IRQF_IRQPOLL            0x00001000
  65 #define IRQF_ONESHOT            0x00002000
  66
  67 /*
  68  * Bits used by threaded handlers:
  69  * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
  70  * IRQTF_DIED      - handler thread died
  71  * IRQTF_WARNED    - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
  72  * IRQTF_AFFINITY  - irq thread is requested to adjust affinity
  73  */
  74 enum {
  75         IRQTF_RUNTHREAD,
  76         IRQTF_DIED,
  77         IRQTF_WARNED,
  78         IRQTF_AFFINITY,
  79 };
  80
  81 typedef irqreturn_t (*irq_handler_t)(int, void *);
  82
  83 /**
  84  * struct irqaction - per interrupt action descriptor
  85  * @handler:    interrupt handler function
  86  * @flags:      flags (see IRQF_* above)
  87  * @name:       name of the device
  88  * @dev_id:     cookie to identify the device
  89  * @next:       pointer to the next irqaction for shared interrupts
  90  * @irq:        interrupt number
  91  * @dir:        pointer to the proc/irq/NN/name entry
  92  * @thread_fn:  interupt handler function for threaded interrupts
  93  * @thread:     thread pointer for threaded interrupts
  94  * @thread_flags:       flags related to @thread
  95  */
  96 struct irqaction {
  97         irq_handler_t handler;
  98         unsigned long flags;
  99         const char *name;
 100         void *dev_id;
 101         struct irqaction *next;
 102         int irq;
 103         struct proc_dir_entry *dir;
 104         irq_handler_t thread_fn;
 105         struct task_struct *thread;
 106         unsigned long thread_flags;
 107 };
 108
 109 extern irqreturn_t no_action(int cpl, void *dev_id);
 110
 111 #ifdef CONFIG_GENERIC_HARDIRQS
 112 extern int __must_check
 113 request_threaded_irq(unsigned int irq, irq_handler_t handler,
 114                      irq_handler_t thread_fn,
 115                      unsigned long flags, const char *name, void *dev);
 116
 117 static inline int __must_check
 118 request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
 119             const char *name, void *dev)
 120 {
 121         return request_threaded_irq(irq, handler, NULL, flags, name, dev);
 122 }
 123
 124 extern void exit_irq_thread(void);
 125 #else
 126
 127 extern int __must_check
 128 request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
 129             const char *name, void *dev);
 130
 131 /*
 132  * Special function to avoid ifdeffery in kernel/irq/devres.c which
 133  * gets magically built by GENERIC_HARDIRQS=n architectures (sparc,
 134  * m68k). I really love these $@%#!* obvious Makefile references:
 135  * ../../../kernel/irq/devres.o
 136  */
 137 static inline int __must_check
 138 request_threaded_irq(unsigned int irq, irq_handler_t handler,
 139                      irq_handler_t thread_fn,
 140                      unsigned long flags, const char *name, void *dev)
 141 {
 142         return request_irq(irq, handler, flags, name, dev);
 143 }
 144
 145 static inline void exit_irq_thread(void) { }
 146 #endif
 147
 148 extern void free_irq(unsigned int, void *);
 149
 150 struct device;
 151
 152 extern int __must_check
 153 devm_request_threaded_irq(struct device *dev, unsigned int irq,
 154                           irq_handler_t handler, irq_handler_t thread_fn,
 155                           unsigned long irqflags, const char *devname,
 156                           void *dev_id);
 157
 158 static inline int __must_check
 159 devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
 160                  unsigned long irqflags, const char *devname, void *dev_id)
 161 {
 162         return devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
 163                                          devname, dev_id);
 164 }
 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 enable_irq(unsigned int irq);
 189
 190 /* The following three functions are for the core kernel use only. */
 191 #ifdef CONFIG_GENERIC_HARDIRQS
 192 extern void suspend_device_irqs(void);
 193 extern void resume_device_irqs(void);
 194 #ifdef CONFIG_PM_SLEEP
 195 extern int check_wakeup_irqs(void);
 196 #else
 197 static inline int check_wakeup_irqs(void) { return 0; }
 198 #endif
 199 #else
 200 static inline void suspend_device_irqs(void) { };
 201 static inline void resume_device_irqs(void) { };
 202 static inline int check_wakeup_irqs(void) { return 0; }
 203 #endif
 204
 205 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
 206
 207 extern cpumask_var_t irq_default_affinity;
 208
 209 extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask);
 210 extern int irq_can_set_affinity(unsigned int irq);
 211 extern int irq_select_affinity(unsigned int irq);
 212
 213 #else /* CONFIG_SMP */
 214
 215 static inline int irq_set_affinity(unsigned int irq, const struct cpumask *m)
 216 {
 217         return -EINVAL;
 218 }
 219
 220 static inline int irq_can_set_affinity(unsigned int irq)
 221 {
 222         return 0;
 223 }
 224
 225 static inline int irq_select_affinity(unsigned int irq)  { return 0; }
 226
 227 #endif /* CONFIG_SMP && CONFIG_GENERIC_HARDIRQS */
 228
 229 #ifdef CONFIG_GENERIC_HARDIRQS
 230 /*
 231  * Special lockdep variants of irq disabling/enabling.
 232  * These should be used for locking constructs that
 233  * know that a particular irq context which is disabled,
 234  * and which is the only irq-context user of a lock,
 235  * that it's safe to take the lock in the irq-disabled
 236  * section without disabling hardirqs.
 237  *
 238  * On !CONFIG_LOCKDEP they are equivalent to the normal
 239  * irq disable/enable methods.
 240  */
 241 static inline void disable_irq_nosync_lockdep(unsigned int irq)
 242 {
 243         disable_irq_nosync(irq);
 244 #ifdef CONFIG_LOCKDEP
 245         local_irq_disable();
 246 #endif
 247 }
 248
 249 static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned long *flags)
 250 {
 251         disable_irq_nosync(irq);
 252 #ifdef CONFIG_LOCKDEP
 253         local_irq_save(*flags);
 254 #endif
 255 }
 256
 257 static inline void disable_irq_lockdep(unsigned int irq)
 258 {
 259         disable_irq(irq);
 260 #ifdef CONFIG_LOCKDEP
 261         local_irq_disable();
 262 #endif
 263 }
 264
 265 static inline void enable_irq_lockdep(unsigned int irq)
 266 {
 267 #ifdef CONFIG_LOCKDEP
 268         local_irq_enable();
 269 #endif
 270         enable_irq(irq);
 271 }
 272
 273 static inline void enable_irq_lockdep_irqrestore(unsigned int irq, unsigned long *flags)
 274 {
 275 #ifdef CONFIG_LOCKDEP
 276         local_irq_restore(*flags);
 277 #endif
 278         enable_irq(irq);
 279 }
 280
 281 /* IRQ wakeup (PM) control: */
 282 extern int set_irq_wake(unsigned int irq, unsigned int on);
 283
 284 static inline int enable_irq_wake(unsigned int irq)
 285 {
 286         return set_irq_wake(irq, 1);
 287 }
 288
 289 static inline int disable_irq_wake(unsigned int irq)
 290 {
 291         return set_irq_wake(irq, 0);
 292 }
 293
 294 #else /* !CONFIG_GENERIC_HARDIRQS */
 295 /*
 296  * NOTE: non-genirq architectures, if they want to support the lock
 297  * validator need to define the methods below in their asm/irq.h
 298  * files, under an #ifdef CONFIG_LOCKDEP section.
 299  */
 300 #ifndef CONFIG_LOCKDEP
 301 #  define disable_irq_nosync_lockdep(irq)       disable_irq_nosync(irq)
 302 #  define disable_irq_nosync_lockdep_irqsave(irq, flags) \
 303                                                 disable_irq_nosync(irq)
 304 #  define disable_irq_lockdep(irq)              disable_irq(irq)
 305 #  define enable_irq_lockdep(irq)               enable_irq(irq)
 306 #  define enable_irq_lockdep_irqrestore(irq, flags) \
 307                                                 enable_irq(irq)
 308 # endif
 309
 310 static inline int enable_irq_wake(unsigned int irq)
 311 {
 312         return 0;
 313 }
 314
 315 static inline int disable_irq_wake(unsigned int irq)
 316 {
 317         return 0;
 318 }
 319 #endif /* CONFIG_GENERIC_HARDIRQS */
 320
 321 #ifndef __ARCH_SET_SOFTIRQ_PENDING
 322 #define set_softirq_pending(x) (local_softirq_pending() = (x))
 323 #define or_softirq_pending(x)  (local_softirq_pending() |= (x))
 324 #endif
 325
 326 /* Some architectures might implement lazy enabling/disabling of
 327  * interrupts. In some cases, such as stop_machine, we might want
 328  * to ensure that after a local_irq_disable(), interrupts have
 329  * really been disabled in hardware. Such architectures need to
 330  * implement the following hook.
 331  */
 332 #ifndef hard_irq_disable
 333 #define hard_irq_disable()      do { } while(0)
 334 #endif
 335
 336 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
 337    frequency threaded job scheduling. For almost all the purposes
 338    tasklets are more than enough. F.e. all serial device BHs et
 339    al. should be converted to tasklets, not to softirqs.
 340  */
 341
 342 enum
 343 {
 344         HI_SOFTIRQ=0,
 345         TIMER_SOFTIRQ,
 346         NET_TX_SOFTIRQ,
 347         NET_RX_SOFTIRQ,
 348         BLOCK_SOFTIRQ,
 349         BLOCK_IOPOLL_SOFTIRQ,
 350         TASKLET_SOFTIRQ,
 351         SCHED_SOFTIRQ,
 352         HRTIMER_SOFTIRQ,
 353         RCU_SOFTIRQ,    /* Preferable RCU should always be the last softirq */
 354
 355         NR_SOFTIRQS
 356 };
 357
 358 /* map softirq index to softirq name. update 'softirq_to_name' in
 359  * kernel/softirq.c when adding a new softirq.
 360  */
 361 extern char *softirq_to_name[NR_SOFTIRQS];
 362
 363 /* softirq mask and active fields moved to irq_cpustat_t in
 364  * asm/hardirq.h to get better cache usage.  KAO
 365  */
 366
 367 struct softirq_action
 368 {
 369         void    (*action)(struct softirq_action *);
 370 };
 371
 372 asmlinkage void do_softirq(void);
 373 asmlinkage void __do_softirq(void);
 374 extern void open_softirq(int nr, void (*action)(struct softirq_action *));
 375 extern void softirq_init(void);
 376 #define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
 377 extern void raise_softirq_irqoff(unsigned int nr);
 378 extern void raise_softirq(unsigned int nr);
 379 extern void wakeup_softirqd(void);
 380
 381 /* This is the worklist that queues up per-cpu softirq work.
 382  *
 383  * send_remote_sendirq() adds work to these lists, and
 384  * the softirq handler itself dequeues from them.  The queues
 385  * are protected by disabling local cpu interrupts and they must
 386  * only be accessed by the local cpu that they are for.
 387  */
 388 DECLARE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list);
 389
 390 /* Try to send a softirq to a remote cpu.  If this cannot be done, the
 391  * work will be queued to the local cpu.
 392  */
 393 extern void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq);
 394
 395 /* Like send_remote_softirq(), but the caller must disable local cpu interrupts
 396  * and compute the current cpu, passed in as 'this_cpu'.
 397  */
 398 extern void __send_remote_softirq(struct call_single_data *cp, int cpu,
 399                                   int this_cpu, int softirq);
 400
 401 /* Tasklets --- multithreaded analogue of BHs.
 402
 403    Main feature differing them of generic softirqs: tasklet
 404    is running only on one CPU simultaneously.
 405
 406    Main feature differing them of BHs: different tasklets
 407    may be run simultaneously on different CPUs.
 408
 409    Properties:
 410    * If tasklet_schedule() is called, then tasklet is guaranteed
 411      to be executed on some cpu at least once after this.
 412    * If the tasklet is already scheduled, but its excecution is still not
 413      started, it will be executed only once.
 414    * If this tasklet is already running on another CPU (or schedule is called
 415      from tasklet itself), it is rescheduled for later.
 416    * Tasklet is strictly serialized wrt itself, but not
 417      wrt another tasklets. If client needs some intertask synchronization,
 418      he makes it with spinlocks.
 419  */
 420
 421 struct tasklet_struct
 422 {
 423         struct tasklet_struct *next;
 424         unsigned long state;
 425         atomic_t count;
 426         void (*func)(unsigned long);
 427         unsigned long data;
 428 };
 429
 430 #define DECLARE_TASKLET(name, func, data) \
 431 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
 432
 433 #define DECLARE_TASKLET_DISABLED(name, func, data) \
 434 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
 435
 436
 437 enum
 438 {
 439         TASKLET_STATE_SCHED,    /* Tasklet is scheduled for execution */
 440         TASKLET_STATE_RUN       /* Tasklet is running (SMP only) */
 441 };
 442
 443 #ifdef CONFIG_SMP
 444 static inline int tasklet_trylock(struct tasklet_struct *t)
 445 {
 446         return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
 447 }
 448
 449 static inline void tasklet_unlock(struct tasklet_struct *t)
 450 {
 451         smp_mb__before_clear_bit();
 452         clear_bit(TASKLET_STATE_RUN, &(t)->state);
 453 }
 454
 455 static inline void tasklet_unlock_wait(struct tasklet_struct *t)
 456 {
 457         while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
 458 }
 459 #else
 460 #define tasklet_trylock(t) 1
 461 #define tasklet_unlock_wait(t) do { } while (0)
 462 #define tasklet_unlock(t) do { } while (0)
 463 #endif
 464
 465 extern void __tasklet_schedule(struct tasklet_struct *t);
 466
 467 static inline void tasklet_schedule(struct tasklet_struct *t)
 468 {
 469         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
 470                 __tasklet_schedule(t);
 471 }
 472
 473 extern void __tasklet_hi_schedule(struct tasklet_struct *t);
 474
 475 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
 476 {
 477         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
 478                 __tasklet_hi_schedule(t);
 479 }
 480
 481 extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
 482
 483 /*
 484  * This version avoids touching any other tasklets. Needed for kmemcheck
 485  * in order not to take any page faults while enqueueing this tasklet;
 486  * consider VERY carefully whether you really need this or
 487  * tasklet_hi_schedule()...
 488  */
 489 static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
 490 {
 491         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
 492                 __tasklet_hi_schedule_first(t);
 493 }
 494
 495
 496 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
 497 {
 498         atomic_inc(&t->count);
 499         smp_mb__after_atomic_inc();
 500 }
 501
 502 static inline void tasklet_disable(struct tasklet_struct *t)
 503 {
 504         tasklet_disable_nosync(t);
 505         tasklet_unlock_wait(t);
 506         smp_mb();
 507 }
 508
 509 static inline void tasklet_enable(struct tasklet_struct *t)
 510 {
 511         smp_mb__before_atomic_dec();
 512         atomic_dec(&t->count);
 513 }
 514
 515 static inline void tasklet_hi_enable(struct tasklet_struct *t)
 516 {
 517         smp_mb__before_atomic_dec();
 518         atomic_dec(&t->count);
 519 }
 520
 521 extern void tasklet_kill(struct tasklet_struct *t);
 522 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
 523 extern void tasklet_init(struct tasklet_struct *t,
 524                          void (*func)(unsigned long), unsigned long data);
 525
 526 struct tasklet_hrtimer {
 527         struct hrtimer          timer;
 528         struct tasklet_struct   tasklet;
 529         enum hrtimer_restart    (*function)(struct hrtimer *);
 530 };
 531
 532 extern void
 533 tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer,
 534                      enum hrtimer_restart (*function)(struct hrtimer *),
 535                      clockid_t which_clock, enum hrtimer_mode mode);
 536
 537 static inline
 538 int tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time,
 539                           const enum hrtimer_mode mode)
 540 {
 541         return hrtimer_start(&ttimer->timer, time, mode);
 542 }
 543
 544 static inline
 545 void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
 546 {
 547         hrtimer_cancel(&ttimer->timer);
 548         tasklet_kill(&ttimer->tasklet);
 549 }
 550
 551 /*
 552  * Autoprobing for irqs:
 553  *
 554  * probe_irq_on() and probe_irq_off() provide robust primitives
 555  * for accurate IRQ probing during kernel initialization.  They are
 556  * reasonably simple to use, are not "fooled" by spurious interrupts,
 557  * and, unlike other attempts at IRQ probing, they do not get hung on
 558  * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
 559  *
 560  * For reasonably foolproof probing, use them as follows:
 561  *
 562  * 1. clear and/or mask the device's internal interrupt.
 563  * 2. sti();
 564  * 3. irqs = probe_irq_on();      // "take over" all unassigned idle IRQs
 565  * 4. enable the device and cause it to trigger an interrupt.
 566  * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
 567  * 6. irq = probe_irq_off(irqs);  // get IRQ number, 0=none, negative=multiple
 568  * 7. service the device to clear its pending interrupt.
 569  * 8. loop again if paranoia is required.
 570  *
 571  * probe_irq_on() returns a mask of allocated irq's.
 572  *
 573  * probe_irq_off() takes the mask as a parameter,
 574  * and returns the irq number which occurred,
 575  * or zero if none occurred, or a negative irq number
 576  * if more than one irq occurred.
 577  */
 578
 579 #if defined(CONFIG_GENERIC_HARDIRQS) && !defined(CONFIG_GENERIC_IRQ_PROBE)
 580 static inline unsigned long probe_irq_on(void)
 581 {
 582         return 0;
 583 }
 584 static inline int probe_irq_off(unsigned long val)
 585 {
 586         return 0;
 587 }
 588 static inline unsigned int probe_irq_mask(unsigned long val)
 589 {
 590         return 0;
 591 }
 592 #else
 593 extern unsigned long probe_irq_on(void);        /* returns 0 on failure */
 594 extern int probe_irq_off(unsigned long);        /* returns 0 or negative on failure */
 595 extern unsigned int probe_irq_mask(unsigned long);      /* returns mask of ISA interrupts */
 596 #endif
 597
 598 #ifdef CONFIG_PROC_FS
 599 /* Initialize /proc/irq/ */
 600 extern void init_irq_proc(void);
 601 #else
 602 static inline void init_irq_proc(void)
 603 {
 604 }
 605 #endif
 606
 607 #if defined(CONFIG_GENERIC_HARDIRQS) && defined(CONFIG_DEBUG_SHIRQ)
 608 extern void debug_poll_all_shared_irqs(void);
 609 #else
 610 static inline void debug_poll_all_shared_irqs(void) { }
 611 #endif
 612
 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