5 * Please do not include this file in generic code. There is currently
6 * no requirement for any architecture to implement anything held
12 #include <linux/smp.h>
16 #include <linux/linkage.h>
17 #include <linux/cache.h>
18 #include <linux/spinlock.h>
19 #include <linux/cpumask.h>
20 #include <linux/gfp.h>
21 #include <linux/irqreturn.h>
22 #include <linux/irqnr.h>
23 #include <linux/errno.h>
24 #include <linux/topology.h>
25 #include <linux/wait.h>
28 #include <asm/ptrace.h>
29 #include <asm/irq_regs.h>
34 typedef void (*irq_flow_handler_t)(unsigned int irq,
35 struct irq_desc *desc);
36 typedef void (*irq_preflow_handler_t)(struct irq_data *data);
41 * Bits 0-7 are the same as the IRQF_* bits in linux/interrupt.h
43 * IRQ_TYPE_NONE - default, unspecified type
44 * IRQ_TYPE_EDGE_RISING - rising edge triggered
45 * IRQ_TYPE_EDGE_FALLING - falling edge triggered
46 * IRQ_TYPE_EDGE_BOTH - rising and falling edge triggered
47 * IRQ_TYPE_LEVEL_HIGH - high level triggered
48 * IRQ_TYPE_LEVEL_LOW - low level triggered
49 * IRQ_TYPE_LEVEL_MASK - Mask to filter out the level bits
50 * IRQ_TYPE_SENSE_MASK - Mask for all the above bits
51 * IRQ_TYPE_PROBE - Special flag for probing in progress
53 * Bits which can be modified via irq_set/clear/modify_status_flags()
54 * IRQ_LEVEL - Interrupt is level type. Will be also
55 * updated in the code when the above trigger
56 * bits are modified via set_irq_type()
57 * IRQ_PER_CPU - Mark an interrupt PER_CPU. Will protect
58 * it from affinity setting
59 * IRQ_NOPROBE - Interrupt cannot be probed by autoprobing
60 * IRQ_NOREQUEST - Interrupt cannot be requested via
62 * IRQ_NOAUTOEN - Interrupt is not automatically enabled in
64 * IRQ_NO_BALANCING - Interrupt cannot be balanced (affinity set)
65 * IRQ_MOVE_PCNTXT - Interrupt can be migrated from process context
66 * IRQ_NESTED_TRHEAD - Interrupt nests into another thread
68 * Deprecated bits. They are kept updated as long as
69 * CONFIG_GENERIC_HARDIRQS_NO_COMPAT is not set. Will go away soon. These bits
70 * are internal state of the core code and if you really need to acces
71 * them then talk to the genirq maintainer instead of hacking
76 IRQ_TYPE_NONE = 0x00000000,
77 IRQ_TYPE_EDGE_RISING = 0x00000001,
78 IRQ_TYPE_EDGE_FALLING = 0x00000002,
79 IRQ_TYPE_EDGE_BOTH = (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING),
80 IRQ_TYPE_LEVEL_HIGH = 0x00000004,
81 IRQ_TYPE_LEVEL_LOW = 0x00000008,
82 IRQ_TYPE_LEVEL_MASK = (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH),
83 IRQ_TYPE_SENSE_MASK = 0x0000000f,
85 IRQ_TYPE_PROBE = 0x00000010,
88 IRQ_PER_CPU = (1 << 9),
89 IRQ_NOPROBE = (1 << 10),
90 IRQ_NOREQUEST = (1 << 11),
91 IRQ_NOAUTOEN = (1 << 12),
92 IRQ_NO_BALANCING = (1 << 13),
93 IRQ_MOVE_PCNTXT = (1 << 14),
94 IRQ_NESTED_THREAD = (1 << 15),
96 #ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
97 IRQ_INPROGRESS = (1 << 16),
98 IRQ_REPLAY = (1 << 17),
99 IRQ_WAITING = (1 << 18),
100 IRQ_DISABLED = (1 << 19),
101 IRQ_PENDING = (1 << 20),
102 IRQ_MASKED = (1 << 21),
103 IRQ_MOVE_PENDING = (1 << 22),
104 IRQ_AFFINITY_SET = (1 << 23),
105 IRQ_WAKEUP = (1 << 24),
109 #define IRQF_MODIFY_MASK \
110 (IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
111 IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \
112 IRQ_PER_CPU | IRQ_NESTED_THREAD)
114 #define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
116 static inline __deprecated bool CHECK_IRQ_PER_CPU(unsigned int status)
118 return status & IRQ_PER_CPU;
122 * Return value for chip->irq_set_affinity()
124 * IRQ_SET_MASK_OK - OK, core updates irq_data.affinity
125 * IRQ_SET_MASK_NOCPY - OK, chip did update irq_data.affinity
129 IRQ_SET_MASK_OK_NOCOPY,
135 * struct irq_data - per irq and irq chip data passed down to chip functions
136 * @irq: interrupt number
137 * @node: node index useful for balancing
138 * @state_use_accessor: status information for irq chip functions.
139 * Use accessor functions to deal with it
140 * @chip: low level interrupt hardware access
141 * @handler_data: per-IRQ data for the irq_chip methods
142 * @chip_data: platform-specific per-chip private data for the chip
143 * methods, to allow shared chip implementations
144 * @msi_desc: MSI descriptor
145 * @affinity: IRQ affinity on SMP
147 * The fields here need to overlay the ones in irq_desc until we
148 * cleaned up the direct references and switched everything over to
154 unsigned int state_use_accessors;
155 struct irq_chip *chip;
158 struct msi_desc *msi_desc;
160 cpumask_var_t affinity;
165 * Bit masks for irq_data.state
167 * IRQD_TRIGGER_MASK - Mask for the trigger type bits
168 * IRQD_SETAFFINITY_PENDING - Affinity setting is pending
169 * IRQD_NO_BALANCING - Balancing disabled for this IRQ
170 * IRQD_PER_CPU - Interrupt is per cpu
171 * IRQD_AFFINITY_SET - Interrupt affinity was set
172 * IRQD_LEVEL - Interrupt is level triggered
173 * IRQD_WAKEUP_STATE - Interrupt is configured for wakeup
175 * IRDQ_MOVE_PCNTXT - Interrupt can be moved in process
177 * IRQD_IRQ_DISABLED - Disabled state of the interrupt
178 * IRQD_IRQ_MASKED - Masked state of the interrupt
179 * IRQD_IRQ_INPROGRESS - In progress state of the interrupt
182 IRQD_TRIGGER_MASK = 0xf,
183 IRQD_SETAFFINITY_PENDING = (1 << 8),
184 IRQD_NO_BALANCING = (1 << 10),
185 IRQD_PER_CPU = (1 << 11),
186 IRQD_AFFINITY_SET = (1 << 12),
187 IRQD_LEVEL = (1 << 13),
188 IRQD_WAKEUP_STATE = (1 << 14),
189 IRQD_MOVE_PCNTXT = (1 << 15),
190 IRQD_IRQ_DISABLED = (1 << 16),
191 IRQD_IRQ_MASKED = (1 << 17),
192 IRQD_IRQ_INPROGRESS = (1 << 18),
195 static inline bool irqd_is_setaffinity_pending(struct irq_data *d)
197 return d->state_use_accessors & IRQD_SETAFFINITY_PENDING;
200 static inline bool irqd_is_per_cpu(struct irq_data *d)
202 return d->state_use_accessors & IRQD_PER_CPU;
205 static inline bool irqd_can_balance(struct irq_data *d)
207 return !(d->state_use_accessors & (IRQD_PER_CPU | IRQD_NO_BALANCING));
210 static inline bool irqd_affinity_was_set(struct irq_data *d)
212 return d->state_use_accessors & IRQD_AFFINITY_SET;
215 static inline u32 irqd_get_trigger_type(struct irq_data *d)
217 return d->state_use_accessors & IRQD_TRIGGER_MASK;
221 * Must only be called inside irq_chip.irq_set_type() functions.
223 static inline void irqd_set_trigger_type(struct irq_data *d, u32 type)
225 d->state_use_accessors &= ~IRQD_TRIGGER_MASK;
226 d->state_use_accessors |= type & IRQD_TRIGGER_MASK;
229 static inline bool irqd_is_level_type(struct irq_data *d)
231 return d->state_use_accessors & IRQD_LEVEL;
234 static inline bool irqd_is_wakeup_set(struct irq_data *d)
236 return d->state_use_accessors & IRQD_WAKEUP_STATE;
239 static inline bool irqd_can_move_in_process_context(struct irq_data *d)
241 return d->state_use_accessors & IRQD_MOVE_PCNTXT;
244 static inline bool irqd_irq_disabled(struct irq_data *d)
246 return d->state_use_accessors & IRQD_IRQ_DISABLED;
249 static inline bool irqd_irq_masked(struct irq_data *d)
251 return d->state_use_accessors & IRQD_IRQ_MASKED;
254 static inline bool irqd_irq_inprogress(struct irq_data *d)
256 return d->state_use_accessors & IRQD_IRQ_INPROGRESS;
260 * struct irq_chip - hardware interrupt chip descriptor
262 * @name: name for /proc/interrupts
263 * @startup: deprecated, replaced by irq_startup
264 * @shutdown: deprecated, replaced by irq_shutdown
265 * @enable: deprecated, replaced by irq_enable
266 * @disable: deprecated, replaced by irq_disable
267 * @ack: deprecated, replaced by irq_ack
268 * @mask: deprecated, replaced by irq_mask
269 * @mask_ack: deprecated, replaced by irq_mask_ack
270 * @unmask: deprecated, replaced by irq_unmask
271 * @eoi: deprecated, replaced by irq_eoi
272 * @end: deprecated, will go away with __do_IRQ()
273 * @set_affinity: deprecated, replaced by irq_set_affinity
274 * @retrigger: deprecated, replaced by irq_retrigger
275 * @set_type: deprecated, replaced by irq_set_type
276 * @set_wake: deprecated, replaced by irq_wake
277 * @bus_lock: deprecated, replaced by irq_bus_lock
278 * @bus_sync_unlock: deprecated, replaced by irq_bus_sync_unlock
280 * @irq_startup: start up the interrupt (defaults to ->enable if NULL)
281 * @irq_shutdown: shut down the interrupt (defaults to ->disable if NULL)
282 * @irq_enable: enable the interrupt (defaults to chip->unmask if NULL)
283 * @irq_disable: disable the interrupt
284 * @irq_ack: start of a new interrupt
285 * @irq_mask: mask an interrupt source
286 * @irq_mask_ack: ack and mask an interrupt source
287 * @irq_unmask: unmask an interrupt source
288 * @irq_eoi: end of interrupt
289 * @irq_set_affinity: set the CPU affinity on SMP machines
290 * @irq_retrigger: resend an IRQ to the CPU
291 * @irq_set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
292 * @irq_set_wake: enable/disable power-management wake-on of an IRQ
293 * @irq_bus_lock: function to lock access to slow bus (i2c) chips
294 * @irq_bus_sync_unlock:function to sync and unlock slow bus (i2c) chips
295 * @irq_cpu_online: configure an interrupt source for a secondary CPU
296 * @irq_cpu_offline: un-configure an interrupt source for a secondary CPU
297 * @irq_print_chip: optional to print special chip info in show_interrupts
298 * @flags: chip specific flags
300 * @release: release function solely used by UML
304 #ifndef CONFIG_GENERIC_HARDIRQS_NO_DEPRECATED
305 unsigned int (*startup)(unsigned int irq);
306 void (*shutdown)(unsigned int irq);
307 void (*enable)(unsigned int irq);
308 void (*disable)(unsigned int irq);
310 void (*ack)(unsigned int irq);
311 void (*mask)(unsigned int irq);
312 void (*mask_ack)(unsigned int irq);
313 void (*unmask)(unsigned int irq);
314 void (*eoi)(unsigned int irq);
316 void (*end)(unsigned int irq);
317 int (*set_affinity)(unsigned int irq,
318 const struct cpumask *dest);
319 int (*retrigger)(unsigned int irq);
320 int (*set_type)(unsigned int irq, unsigned int flow_type);
321 int (*set_wake)(unsigned int irq, unsigned int on);
323 void (*bus_lock)(unsigned int irq);
324 void (*bus_sync_unlock)(unsigned int irq);
326 unsigned int (*irq_startup)(struct irq_data *data);
327 void (*irq_shutdown)(struct irq_data *data);
328 void (*irq_enable)(struct irq_data *data);
329 void (*irq_disable)(struct irq_data *data);
331 void (*irq_ack)(struct irq_data *data);
332 void (*irq_mask)(struct irq_data *data);
333 void (*irq_mask_ack)(struct irq_data *data);
334 void (*irq_unmask)(struct irq_data *data);
335 void (*irq_eoi)(struct irq_data *data);
337 int (*irq_set_affinity)(struct irq_data *data, const struct cpumask *dest, bool force);
338 int (*irq_retrigger)(struct irq_data *data);
339 int (*irq_set_type)(struct irq_data *data, unsigned int flow_type);
340 int (*irq_set_wake)(struct irq_data *data, unsigned int on);
342 void (*irq_bus_lock)(struct irq_data *data);
343 void (*irq_bus_sync_unlock)(struct irq_data *data);
345 void (*irq_cpu_online)(struct irq_data *data);
346 void (*irq_cpu_offline)(struct irq_data *data);
348 void (*irq_print_chip)(struct irq_data *data, struct seq_file *p);
352 /* Currently used only by UML, might disappear one day.*/
353 #ifdef CONFIG_IRQ_RELEASE_METHOD
354 void (*release)(unsigned int irq, void *dev_id);
359 * irq_chip specific flags
361 * IRQCHIP_SET_TYPE_MASKED: Mask before calling chip.irq_set_type()
362 * IRQCHIP_EOI_IF_HANDLED: Only issue irq_eoi() when irq was handled
363 * IRQCHIP_MASK_ON_SUSPEND: Mask non wake irqs in the suspend path
364 * IRQCHIP_ONOFFLINE_ENABLED: Only call irq_on/off_line callbacks
368 IRQCHIP_SET_TYPE_MASKED = (1 << 0),
369 IRQCHIP_EOI_IF_HANDLED = (1 << 1),
370 IRQCHIP_MASK_ON_SUSPEND = (1 << 2),
371 IRQCHIP_ONOFFLINE_ENABLED = (1 << 3),
374 /* This include will go away once we isolated irq_desc usage to core code */
375 #include <linux/irqdesc.h>
378 * Pick up the arch-dependent methods:
380 #include <asm/hw_irq.h>
382 #ifndef NR_IRQS_LEGACY
383 # define NR_IRQS_LEGACY 0
386 #ifndef ARCH_IRQ_INIT_FLAGS
387 # define ARCH_IRQ_INIT_FLAGS 0
390 #define IRQ_DEFAULT_INIT_FLAGS ARCH_IRQ_INIT_FLAGS
393 extern int setup_irq(unsigned int irq, struct irqaction *new);
394 extern void remove_irq(unsigned int irq, struct irqaction *act);
396 extern void irq_cpu_online(void);
397 extern void irq_cpu_offline(void);
398 extern int __irq_set_affinity_locked(struct irq_data *data, const struct cpumask *cpumask);
400 #ifdef CONFIG_GENERIC_HARDIRQS
402 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)
403 void move_native_irq(int irq);
404 void move_masked_irq(int irq);
405 void irq_move_irq(struct irq_data *data);
406 void irq_move_masked_irq(struct irq_data *data);
408 static inline void move_native_irq(int irq) { }
409 static inline void move_masked_irq(int irq) { }
410 static inline void irq_move_irq(struct irq_data *data) { }
411 static inline void irq_move_masked_irq(struct irq_data *data) { }
414 extern int no_irq_affinity;
416 /* Handle irq action chains: */
417 extern irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action);
420 * Built-in IRQ handlers for various IRQ types,
421 * callable via desc->handle_irq()
423 extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
424 extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
425 extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
426 extern void handle_edge_eoi_irq(unsigned int irq, struct irq_desc *desc);
427 extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
428 extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
429 extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
430 extern void handle_nested_irq(unsigned int irq);
432 /* Handling of unhandled and spurious interrupts: */
433 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
434 irqreturn_t action_ret);
437 /* Enable/disable irq debugging output: */
438 extern int noirqdebug_setup(char *str);
440 /* Checks whether the interrupt can be requested by request_irq(): */
441 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
443 /* Dummy irq-chip implementations: */
444 extern struct irq_chip no_irq_chip;
445 extern struct irq_chip dummy_irq_chip;
448 irq_set_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
449 irq_flow_handler_t handle, const char *name);
451 static inline void irq_set_chip_and_handler(unsigned int irq, struct irq_chip *chip,
452 irq_flow_handler_t handle)
454 irq_set_chip_and_handler_name(irq, chip, handle, NULL);
458 __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
462 irq_set_handler(unsigned int irq, irq_flow_handler_t handle)
464 __irq_set_handler(irq, handle, 0, NULL);
468 * Set a highlevel chained flow handler for a given IRQ.
469 * (a chained handler is automatically enabled and set to
470 * IRQ_NOREQUEST and IRQ_NOPROBE)
473 irq_set_chained_handler(unsigned int irq, irq_flow_handler_t handle)
475 __irq_set_handler(irq, handle, 1, NULL);
478 void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set);
480 static inline void irq_set_status_flags(unsigned int irq, unsigned long set)
482 irq_modify_status(irq, 0, set);
485 static inline void irq_clear_status_flags(unsigned int irq, unsigned long clr)
487 irq_modify_status(irq, clr, 0);
490 static inline void irq_set_noprobe(unsigned int irq)
492 irq_modify_status(irq, 0, IRQ_NOPROBE);
495 static inline void irq_set_probe(unsigned int irq)
497 irq_modify_status(irq, IRQ_NOPROBE, 0);
500 static inline void irq_set_nested_thread(unsigned int irq, bool nest)
503 irq_set_status_flags(irq, IRQ_NESTED_THREAD);
505 irq_clear_status_flags(irq, IRQ_NESTED_THREAD);
508 /* Handle dynamic irq creation and destruction */
509 extern unsigned int create_irq_nr(unsigned int irq_want, int node);
510 extern int create_irq(void);
511 extern void destroy_irq(unsigned int irq);
514 * Dynamic irq helper functions. Obsolete. Use irq_alloc_desc* and
515 * irq_free_desc instead.
517 extern void dynamic_irq_cleanup(unsigned int irq);
518 static inline void dynamic_irq_init(unsigned int irq)
520 dynamic_irq_cleanup(irq);
523 /* Set/get chip/data for an IRQ: */
524 extern int irq_set_chip(unsigned int irq, struct irq_chip *chip);
525 extern int irq_set_handler_data(unsigned int irq, void *data);
526 extern int irq_set_chip_data(unsigned int irq, void *data);
527 extern int irq_set_irq_type(unsigned int irq, unsigned int type);
528 extern int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry);
529 extern struct irq_data *irq_get_irq_data(unsigned int irq);
531 static inline struct irq_chip *irq_get_chip(unsigned int irq)
533 struct irq_data *d = irq_get_irq_data(irq);
534 return d ? d->chip : NULL;
537 static inline struct irq_chip *irq_data_get_irq_chip(struct irq_data *d)
542 static inline void *irq_get_chip_data(unsigned int irq)
544 struct irq_data *d = irq_get_irq_data(irq);
545 return d ? d->chip_data : NULL;
548 static inline void *irq_data_get_irq_chip_data(struct irq_data *d)
553 static inline void *irq_get_handler_data(unsigned int irq)
555 struct irq_data *d = irq_get_irq_data(irq);
556 return d ? d->handler_data : NULL;
559 static inline void *irq_data_get_irq_handler_data(struct irq_data *d)
561 return d->handler_data;
564 static inline struct msi_desc *irq_get_msi_desc(unsigned int irq)
566 struct irq_data *d = irq_get_irq_data(irq);
567 return d ? d->msi_desc : NULL;
570 static inline struct msi_desc *irq_data_get_msi(struct irq_data *d)
575 #ifndef CONFIG_GENERIC_HARDIRQS_NO_COMPAT
576 /* Please do not use: Use the replacement functions instead */
577 static inline int set_irq_chip(unsigned int irq, struct irq_chip *chip)
579 return irq_set_chip(irq, chip);
581 static inline int set_irq_data(unsigned int irq, void *data)
583 return irq_set_handler_data(irq, data);
585 static inline int set_irq_chip_data(unsigned int irq, void *data)
587 return irq_set_chip_data(irq, data);
589 static inline int set_irq_type(unsigned int irq, unsigned int type)
591 return irq_set_irq_type(irq, type);
593 static inline int set_irq_msi(unsigned int irq, struct msi_desc *entry)
595 return irq_set_msi_desc(irq, entry);
597 static inline struct irq_chip *get_irq_chip(unsigned int irq)
599 return irq_get_chip(irq);
601 static inline void *get_irq_chip_data(unsigned int irq)
603 return irq_get_chip_data(irq);
605 static inline void *get_irq_data(unsigned int irq)
607 return irq_get_handler_data(irq);
609 static inline void *irq_data_get_irq_data(struct irq_data *d)
611 return irq_data_get_irq_handler_data(d);
613 static inline struct msi_desc *get_irq_msi(unsigned int irq)
615 return irq_get_msi_desc(irq);
617 static inline void set_irq_noprobe(unsigned int irq)
619 irq_set_noprobe(irq);
621 static inline void set_irq_probe(unsigned int irq)
625 static inline void set_irq_nested_thread(unsigned int irq, int nest)
627 irq_set_nested_thread(irq, nest);
630 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
631 irq_flow_handler_t handle, const char *name)
633 irq_set_chip_and_handler_name(irq, chip, handle, name);
636 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
637 irq_flow_handler_t handle)
639 irq_set_chip_and_handler(irq, chip, handle);
642 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
645 __irq_set_handler(irq, handle, is_chained, name);
647 static inline void set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
649 irq_set_handler(irq, handle);
652 set_irq_chained_handler(unsigned int irq, irq_flow_handler_t handle)
654 irq_set_chained_handler(irq, handle);
658 int irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node);
659 void irq_free_descs(unsigned int irq, unsigned int cnt);
660 int irq_reserve_irqs(unsigned int from, unsigned int cnt);
662 static inline int irq_alloc_desc(int node)
664 return irq_alloc_descs(-1, 0, 1, node);
667 static inline int irq_alloc_desc_at(unsigned int at, int node)
669 return irq_alloc_descs(at, at, 1, node);
672 static inline int irq_alloc_desc_from(unsigned int from, int node)
674 return irq_alloc_descs(-1, from, 1, node);
677 static inline void irq_free_desc(unsigned int irq)
679 irq_free_descs(irq, 1);
682 static inline int irq_reserve_irq(unsigned int irq)
684 return irq_reserve_irqs(irq, 1);
687 #endif /* CONFIG_GENERIC_HARDIRQS */
689 #endif /* !CONFIG_S390 */
691 #endif /* _LINUX_IRQ_H */