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1 | /* MECHANICALLY GENERATED, DO NOT EDIT!!! */ |
2 | ||
3 | /* | |
4 | * common.h: Common Linux kernel-isms. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; but version 2 of the License only due | |
9 | * to code included from the Linux kernel. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | * | |
20 | * Copyright (c) 2006 Paul E. McKenney, IBM. | |
21 | * | |
22 | * Much code taken from the Linux kernel. For such code, the option | |
23 | * to redistribute under later versions of GPL might not be available. | |
24 | */ | |
25 | ||
26 | #ifndef __always_inline | |
27 | #define __always_inline inline | |
28 | #endif | |
29 | ||
30 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) | |
31 | #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) | |
32 | ||
33 | #ifdef __ASSEMBLY__ | |
34 | # define stringify_in_c(...) __VA_ARGS__ | |
35 | # define ASM_CONST(x) x | |
36 | #else | |
37 | /* This version of stringify will deal with commas... */ | |
38 | # define __stringify_in_c(...) #__VA_ARGS__ | |
39 | # define stringify_in_c(...) __stringify_in_c(__VA_ARGS__) " " | |
40 | # define __ASM_CONST(x) x##UL | |
41 | # define ASM_CONST(x) __ASM_CONST(x) | |
42 | #endif | |
43 | ||
44 | ||
45 | /* | |
46 | * arch-i386.h: Expose x86 atomic instructions. 80486 and better only. | |
47 | * | |
48 | * This program is free software; you can redistribute it and/or modify | |
49 | * it under the terms of the GNU General Public License as published by | |
50 | * the Free Software Foundation, but version 2 only due to inclusion | |
51 | * of Linux-kernel code. | |
52 | * | |
53 | * This program is distributed in the hope that it will be useful, | |
54 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
55 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
56 | * GNU General Public License for more details. | |
57 | * | |
58 | * You should have received a copy of the GNU General Public License | |
59 | * along with this program; if not, write to the Free Software | |
60 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
61 | * | |
62 | * Copyright (c) 2006 Paul E. McKenney, IBM. | |
63 | * | |
64 | * Much code taken from the Linux kernel. For such code, the option | |
65 | * to redistribute under later versions of GPL might not be available. | |
66 | */ | |
67 | ||
68 | /* | |
69 | * Machine parameters. | |
70 | */ | |
71 | ||
72 | #define CONFIG_SMP | |
73 | ||
74 | #define CACHE_LINE_SIZE 64 | |
75 | #define ____cacheline_internodealigned_in_smp \ | |
76 | __attribute__((__aligned__(1 << 6))) | |
77 | ||
78 | #define LOCK_PREFIX "lock ; " | |
79 | ||
80 | /* | |
81 | * Atomic data structure, initialization, and access. | |
82 | */ | |
83 | ||
84 | typedef struct { volatile int counter; } atomic_t; | |
85 | ||
86 | #define ATOMIC_INIT(i) { (i) } | |
87 | ||
88 | #define atomic_read(v) ((v)->counter) | |
89 | #define atomic_set(v, i) (((v)->counter) = (i)) | |
90 | ||
91 | /* | |
92 | * Atomic operations. | |
93 | */ | |
94 | ||
95 | /** | |
96 | * atomic_add - add integer to atomic variable | |
97 | * @i: integer value to add | |
98 | * @v: pointer of type atomic_t | |
99 | * | |
100 | * Atomically adds @i to @v. | |
101 | */ | |
102 | static __inline__ void atomic_add(int i, atomic_t *v) | |
103 | { | |
104 | __asm__ __volatile__( | |
105 | LOCK_PREFIX "addl %1,%0" | |
106 | :"+m" (v->counter) | |
107 | :"ir" (i)); | |
108 | } | |
109 | ||
110 | /** | |
111 | * atomic_sub - subtract the atomic variable | |
112 | * @i: integer value to subtract | |
113 | * @v: pointer of type atomic_t | |
114 | * | |
115 | * Atomically subtracts @i from @v. | |
116 | */ | |
117 | static __inline__ void atomic_sub(int i, atomic_t *v) | |
118 | { | |
119 | __asm__ __volatile__( | |
120 | LOCK_PREFIX "subl %1,%0" | |
121 | :"+m" (v->counter) | |
122 | :"ir" (i)); | |
123 | } | |
124 | ||
125 | /** | |
126 | * atomic_sub_and_test - subtract value from variable and test result | |
127 | * @i: integer value to subtract | |
128 | * @v: pointer of type atomic_t | |
129 | * | |
130 | * Atomically subtracts @i from @v and returns | |
131 | * true if the result is zero, or false for all | |
132 | * other cases. | |
133 | */ | |
134 | static __inline__ int atomic_sub_and_test(int i, atomic_t *v) | |
135 | { | |
136 | unsigned char c; | |
137 | ||
138 | __asm__ __volatile__( | |
139 | LOCK_PREFIX "subl %2,%0; sete %1" | |
140 | :"+m" (v->counter), "=qm" (c) | |
141 | :"ir" (i) : "memory"); | |
142 | return c; | |
143 | } | |
144 | ||
145 | /** | |
146 | * atomic_inc - increment atomic variable | |
147 | * @v: pointer of type atomic_t | |
148 | * | |
149 | * Atomically increments @v by 1. | |
150 | */ | |
151 | static __inline__ void __atomic_inc(atomic_t *v) | |
152 | { | |
153 | __asm__ __volatile__( | |
154 | LOCK_PREFIX "incl %0" | |
155 | :"+m" (v->counter)); | |
156 | } | |
157 | ||
158 | /** | |
159 | * atomic_dec - decrement atomic variable | |
160 | * @v: pointer of type atomic_t | |
161 | * | |
162 | * Atomically decrements @v by 1. | |
163 | */ | |
164 | static __inline__ void atomic_dec(atomic_t *v) | |
165 | { | |
166 | __asm__ __volatile__( | |
167 | LOCK_PREFIX "decl %0" | |
168 | :"+m" (v->counter)); | |
169 | } | |
170 | ||
171 | /** | |
172 | * atomic_dec_and_test - decrement and test | |
173 | * @v: pointer of type atomic_t | |
174 | * | |
175 | * Atomically decrements @v by 1 and | |
176 | * returns true if the result is 0, or false for all other | |
177 | * cases. | |
178 | */ | |
179 | static __inline__ int atomic_dec_and_test(atomic_t *v) | |
180 | { | |
181 | unsigned char c; | |
182 | ||
183 | __asm__ __volatile__( | |
184 | LOCK_PREFIX "decl %0; sete %1" | |
185 | :"+m" (v->counter), "=qm" (c) | |
186 | : : "memory"); | |
187 | return c != 0; | |
188 | } | |
189 | ||
190 | /** | |
191 | * atomic_inc_and_test - increment and test | |
192 | * @v: pointer of type atomic_t | |
193 | * | |
194 | * Atomically increments @v by 1 | |
195 | * and returns true if the result is zero, or false for all | |
196 | * other cases. | |
197 | */ | |
198 | static __inline__ int atomic_inc_and_test(atomic_t *v) | |
199 | { | |
200 | unsigned char c; | |
201 | ||
202 | __asm__ __volatile__( | |
203 | LOCK_PREFIX "incl %0; sete %1" | |
204 | :"+m" (v->counter), "=qm" (c) | |
205 | : : "memory"); | |
206 | return c != 0; | |
207 | } | |
208 | ||
209 | /** | |
210 | * atomic_add_negative - add and test if negative | |
211 | * @v: pointer of type atomic_t | |
212 | * @i: integer value to add | |
213 | * | |
214 | * Atomically adds @i to @v and returns true | |
215 | * if the result is negative, or false when | |
216 | * result is greater than or equal to zero. | |
217 | */ | |
218 | static __inline__ int atomic_add_negative(int i, atomic_t *v) | |
219 | { | |
220 | unsigned char c; | |
221 | ||
222 | __asm__ __volatile__( | |
223 | LOCK_PREFIX "addl %2,%0; sets %1" | |
224 | :"+m" (v->counter), "=qm" (c) | |
225 | :"ir" (i) : "memory"); | |
226 | return c; | |
227 | } | |
228 | ||
229 | /** | |
230 | * atomic_add_return - add and return | |
231 | * @v: pointer of type atomic_t | |
232 | * @i: integer value to add | |
233 | * | |
234 | * Atomically adds @i to @v and returns @i + @v | |
235 | */ | |
236 | static __inline__ int atomic_add_return(int i, atomic_t *v) | |
237 | { | |
238 | int __i; | |
239 | ||
240 | __i = i; | |
241 | __asm__ __volatile__( | |
242 | LOCK_PREFIX "xaddl %0, %1;" | |
243 | :"=r"(i) | |
244 | :"m"(v->counter), "0"(i)); | |
245 | return i + __i; | |
246 | } | |
247 | ||
248 | static __inline__ int atomic_sub_return(int i, atomic_t *v) | |
249 | { | |
250 | return atomic_add_return(-i,v); | |
251 | } | |
252 | ||
253 | static inline unsigned int | |
254 | cmpxchg(volatile long *ptr, long oldval, long newval) | |
255 | { | |
256 | unsigned long retval; | |
257 | ||
258 | asm("# cmpxchg\n" | |
259 | "lock; cmpxchgl %4,(%2)\n" | |
260 | "# end atomic_cmpxchg4" | |
261 | : "=a" (retval), "=m" (*ptr) | |
262 | : "r" (ptr), "0" (oldval), "r" (newval), "m" (*ptr) | |
263 | : "cc"); | |
264 | return (retval); | |
265 | } | |
266 | ||
267 | #define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new)) | |
268 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) | |
269 | ||
270 | /** | |
271 | * atomic_add_unless - add unless the number is a given value | |
272 | * @v: pointer of type atomic_t | |
273 | * @a: the amount to add to v... | |
274 | * @u: ...unless v is equal to u. | |
275 | * | |
276 | * Atomically adds @a to @v, so long as it was not @u. | |
277 | * Returns non-zero if @v was not @u, and zero otherwise. | |
278 | */ | |
279 | #define atomic_add_unless(v, a, u) \ | |
280 | ({ \ | |
281 | int c, old; \ | |
282 | c = atomic_read(v); \ | |
283 | for (;;) { \ | |
284 | if (unlikely(c == (u))) \ | |
285 | break; \ | |
286 | old = atomic_cmpxchg((v), c, c + (a)); \ | |
287 | if (likely(old == c)) \ | |
288 | break; \ | |
289 | c = old; \ | |
290 | } \ | |
291 | c != (u); \ | |
292 | }) | |
293 | #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) | |
294 | ||
295 | #define atomic_inc_return(v) (atomic_add_return(1,v)) | |
296 | #define atomic_dec_return(v) (atomic_sub_return(1,v)) | |
297 | ||
298 | /* These are x86-specific, used by some header files */ | |
299 | #define atomic_clear_mask(mask, addr) \ | |
300 | __asm__ __volatile__(LOCK_PREFIX "andl %0,%1" \ | |
301 | : : "r" (~(mask)),"m" (*addr) : "memory") | |
302 | ||
303 | #define atomic_set_mask(mask, addr) \ | |
304 | __asm__ __volatile__(LOCK_PREFIX "orl %0,%1" \ | |
305 | : : "r" (mask),"m" (*(addr)) : "memory") | |
306 | ||
307 | /* Atomic operations are already serializing on x86 */ | |
308 | #define smp_mb__before_atomic_dec() barrier() | |
309 | #define smp_mb__after_atomic_dec() barrier() | |
310 | #define smp_mb__before_atomic_inc() barrier() | |
311 | #define smp_mb__after_atomic_inc() barrier() | |
312 | ||
313 | #define smp_mb() \ | |
314 | __asm__ __volatile__("mfence" : : : "memory") | |
315 | /* __asm__ __volatile__("lock; addl $0,0(%%esp)" : : : "memory") */ | |
316 | ||
317 | ||
318 | /* | |
319 | * Generate 64-bit timestamp. | |
320 | */ | |
321 | ||
322 | static unsigned long long get_timestamp(void) | |
323 | { | |
324 | unsigned int __a,__d; | |
325 | ||
326 | __asm__ __volatile__("rdtsc" : "=a" (__a), "=d" (__d)); | |
327 | return ((long long)__a) | (((long long)__d)<<32); | |
328 | } | |
329 | ||
330 | /* | |
331 | * api_pthreads.h: API mapping to pthreads environment. | |
332 | * | |
333 | * This program is free software; you can redistribute it and/or modify | |
334 | * it under the terms of the GNU General Public License as published by | |
335 | * the Free Software Foundation; either version 2 of the License, or | |
336 | * (at your option) any later version. However, please note that much | |
337 | * of the code in this file derives from the Linux kernel, and that such | |
338 | * code may not be available except under GPLv2. | |
339 | * | |
340 | * This program is distributed in the hope that it will be useful, | |
341 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
342 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
343 | * GNU General Public License for more details. | |
344 | * | |
345 | * You should have received a copy of the GNU General Public License | |
346 | * along with this program; if not, write to the Free Software | |
347 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
348 | * | |
349 | * Copyright (c) 2006 Paul E. McKenney, IBM. | |
350 | */ | |
351 | ||
352 | #include <stdio.h> | |
353 | #include <stdlib.h> | |
354 | #include <errno.h> | |
355 | #include <limits.h> | |
356 | #include <sys/types.h> | |
357 | #define __USE_GNU | |
358 | #include <pthread.h> | |
359 | #include <sched.h> | |
360 | #include <sys/param.h> | |
361 | /* #include "atomic.h" */ | |
362 | ||
363 | /* | |
364 | * Compiler magic. | |
365 | */ | |
366 | #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) | |
367 | #define container_of(ptr, type, member) ({ \ | |
368 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ | |
369 | (type *)( (char *)__mptr - offsetof(type,member) );}) | |
370 | #define barrier() __asm__ __volatile__("": : :"memory") | |
371 | ||
372 | /* | |
373 | * Default machine parameters. | |
374 | */ | |
375 | ||
376 | #ifndef CACHE_LINE_SIZE | |
377 | #define CACHE_LINE_SIZE 128 | |
378 | #endif /* #ifndef CACHE_LINE_SIZE */ | |
379 | ||
380 | /* | |
381 | * Exclusive locking primitives. | |
382 | */ | |
383 | ||
384 | typedef pthread_mutex_t spinlock_t; | |
385 | ||
386 | #define DEFINE_SPINLOCK(lock) spinlock_t lock = PTHREAD_MUTEX_INITIALIZER; | |
387 | #define __SPIN_LOCK_UNLOCKED(lockp) PTHREAD_MUTEX_INITIALIZER | |
388 | ||
389 | static void spin_lock_init(spinlock_t *sp) | |
390 | { | |
391 | if (pthread_mutex_init(sp, NULL) != 0) { | |
392 | perror("spin_lock_init:pthread_mutex_init"); | |
393 | exit(-1); | |
394 | } | |
395 | } | |
396 | ||
397 | static void spin_lock(spinlock_t *sp) | |
398 | { | |
399 | if (pthread_mutex_lock(sp) != 0) { | |
400 | perror("spin_lock:pthread_mutex_lock"); | |
401 | exit(-1); | |
402 | } | |
403 | } | |
404 | ||
405 | static int spin_trylock(spinlock_t *sp) | |
406 | { | |
407 | int retval; | |
408 | ||
409 | if ((retval = pthread_mutex_trylock(sp)) == 0) | |
410 | return 1; | |
411 | if (retval == EBUSY) | |
412 | return 0; | |
413 | perror("spin_trylock:pthread_mutex_trylock"); | |
414 | exit(-1); | |
415 | } | |
416 | ||
417 | static void spin_unlock(spinlock_t *sp) | |
418 | { | |
419 | if (pthread_mutex_unlock(sp) != 0) { | |
420 | perror("spin_unlock:pthread_mutex_unlock"); | |
421 | exit(-1); | |
422 | } | |
423 | } | |
424 | ||
425 | #define spin_lock_irqsave(l, f) do { f = 1; spin_lock(l); } while (0) | |
426 | #define spin_unlock_irqrestore(l, f) do { f = 0; spin_unlock(l); } while (0) | |
427 | ||
428 | #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) | |
429 | #define unlikely(x) x | |
430 | #define likely(x) x | |
431 | #define prefetch(x) x | |
432 | ||
433 | /* | |
434 | * Thread creation/destruction primitives. | |
435 | */ | |
436 | ||
437 | typedef pthread_t thread_id_t; | |
438 | ||
439 | #define NR_THREADS 128 | |
440 | ||
441 | #define __THREAD_ID_MAP_EMPTY 0 | |
442 | #define __THREAD_ID_MAP_WAITING 1 | |
443 | thread_id_t __thread_id_map[NR_THREADS]; | |
444 | spinlock_t __thread_id_map_mutex; | |
445 | ||
446 | #define for_each_thread(t) \ | |
447 | for (t = 0; t < NR_THREADS; t++) | |
448 | ||
449 | #define for_each_running_thread(t) \ | |
450 | for (t = 0; t < NR_THREADS; t++) \ | |
451 | if ((__thread_id_map[t] != __THREAD_ID_MAP_EMPTY) && \ | |
452 | (__thread_id_map[t] != __THREAD_ID_MAP_WAITING)) | |
453 | ||
454 | pthread_key_t thread_id_key; | |
455 | ||
456 | static int __smp_thread_id(void) | |
457 | { | |
458 | int i; | |
459 | thread_id_t tid = pthread_self(); | |
460 | ||
461 | for (i = 0; i < NR_THREADS; i++) { | |
462 | if (__thread_id_map[i] == tid) { | |
463 | long v = i + 1; /* must be non-NULL. */ | |
464 | ||
465 | if (pthread_setspecific(thread_id_key, (void *)v) != 0) { | |
466 | perror("pthread_setspecific"); | |
467 | exit(-1); | |
468 | } | |
469 | return i; | |
470 | } | |
471 | } | |
472 | spin_lock(&__thread_id_map_mutex); | |
473 | for (i = 0; i < NR_THREADS; i++) { | |
474 | if (__thread_id_map[i] == tid) | |
475 | spin_unlock(&__thread_id_map_mutex); | |
476 | return i; | |
477 | } | |
478 | spin_unlock(&__thread_id_map_mutex); | |
479 | fprintf(stderr, "smp_thread_id: Rogue thread, id: %d(%#x)\n", tid, tid); | |
480 | exit(-1); | |
481 | } | |
482 | ||
483 | static int smp_thread_id(void) | |
484 | { | |
485 | void *id; | |
486 | ||
487 | id = pthread_getspecific(thread_id_key); | |
488 | if (id == NULL) | |
489 | return __smp_thread_id(); | |
490 | return (long)(id - 1); | |
491 | } | |
492 | ||
493 | static thread_id_t create_thread(void *(*func)(void *), void *arg) | |
494 | { | |
495 | thread_id_t tid; | |
496 | int i; | |
497 | ||
498 | spin_lock(&__thread_id_map_mutex); | |
499 | for (i = 0; i < NR_THREADS; i++) { | |
500 | if (__thread_id_map[i] == __THREAD_ID_MAP_EMPTY) | |
501 | break; | |
502 | } | |
503 | if (i >= NR_THREADS) { | |
504 | spin_unlock(&__thread_id_map_mutex); | |
505 | fprintf(stderr, "Thread limit of %d exceeded!\n", NR_THREADS); | |
506 | exit(-1); | |
507 | } | |
508 | __thread_id_map[i] = __THREAD_ID_MAP_WAITING; | |
509 | spin_unlock(&__thread_id_map_mutex); | |
510 | if (pthread_create(&tid, NULL, func, arg) != 0) { | |
511 | perror("create_thread:pthread_create"); | |
512 | exit(-1); | |
513 | } | |
514 | __thread_id_map[i] = tid; | |
515 | return tid; | |
516 | } | |
517 | ||
518 | static void *wait_thread(thread_id_t tid) | |
519 | { | |
520 | int i; | |
521 | void *vp; | |
522 | ||
523 | for (i = 0; i < NR_THREADS; i++) { | |
524 | if (__thread_id_map[i] == tid) | |
525 | break; | |
526 | } | |
527 | if (i >= NR_THREADS){ | |
528 | fprintf(stderr, "wait_thread: bad tid = %d(%#x)\n", tid, tid); | |
529 | exit(-1); | |
530 | } | |
531 | if (pthread_join(tid, &vp) != 0) { | |
532 | perror("wait_thread:pthread_join"); | |
533 | exit(-1); | |
534 | } | |
535 | __thread_id_map[i] = __THREAD_ID_MAP_EMPTY; | |
536 | return vp; | |
537 | } | |
538 | ||
539 | static void wait_all_threads(void) | |
540 | { | |
541 | int i; | |
542 | thread_id_t tid; | |
543 | ||
544 | for (i = 1; i < NR_THREADS; i++) { | |
545 | tid = __thread_id_map[i]; | |
546 | if (tid != __THREAD_ID_MAP_EMPTY && | |
547 | tid != __THREAD_ID_MAP_WAITING) | |
548 | (void)wait_thread(tid); | |
549 | } | |
550 | } | |
551 | ||
552 | static void run_on(int cpu) | |
553 | { | |
554 | cpu_set_t mask; | |
555 | ||
556 | CPU_ZERO(&mask); | |
557 | CPU_SET(cpu, &mask); | |
558 | sched_setaffinity(0, sizeof(mask), &mask); | |
559 | } | |
560 | ||
561 | /* | |
562 | * timekeeping -- very crude -- should use MONOTONIC... | |
563 | */ | |
564 | ||
565 | long long get_microseconds(void) | |
566 | { | |
567 | struct timeval tv; | |
568 | ||
569 | if (gettimeofday(&tv, NULL) != 0) | |
570 | abort(); | |
571 | return ((long long)tv.tv_sec) * 1000000LL + (long long)tv.tv_usec; | |
572 | } | |
573 | ||
574 | /* | |
575 | * Per-thread variables. | |
576 | */ | |
577 | ||
578 | #define DEFINE_PER_THREAD(type, name) \ | |
579 | struct { \ | |
580 | __typeof__(type) v \ | |
581 | __attribute__((__aligned__(CACHE_LINE_SIZE))); \ | |
582 | } __per_thread_##name[NR_THREADS]; | |
583 | #define DECLARE_PER_THREAD(type, name) extern DEFINE_PER_THREAD(type, name) | |
584 | ||
585 | #define per_thread(name, thread) __per_thread_##name[thread].v | |
586 | #define __get_thread_var(name) per_thread(name, smp_thread_id()) | |
587 | ||
588 | #define init_per_thread(name, v) \ | |
589 | do { \ | |
590 | int __i_p_t_i; \ | |
591 | for (__i_p_t_i = 0; __i_p_t_i < NR_THREADS; __i_p_t_i++) \ | |
592 | per_thread(name, __i_p_t_i) = v; \ | |
593 | } while (0) | |
594 | ||
595 | /* | |
596 | * CPU traversal primitives. | |
597 | */ | |
598 | ||
599 | #ifndef NR_CPUS | |
600 | #define NR_CPUS 16 | |
601 | #endif /* #ifndef NR_CPUS */ | |
602 | ||
603 | #define for_each_possible_cpu(cpu) \ | |
604 | for (cpu = 0; cpu < NR_CPUS; cpu++) | |
605 | #define for_each_online_cpu(cpu) \ | |
606 | for (cpu = 0; cpu < NR_CPUS; cpu++) | |
607 | ||
608 | /* | |
609 | * Per-CPU variables. | |
610 | */ | |
611 | ||
612 | #define DEFINE_PER_CPU(type, name) \ | |
613 | struct { \ | |
614 | __typeof__(type) v \ | |
615 | __attribute__((__aligned__(CACHE_LINE_SIZE))); \ | |
616 | } __per_cpu_##name[NR_CPUS] | |
617 | #define DECLARE_PER_CPU(type, name) extern DEFINE_PER_CPU(type, name) | |
618 | ||
619 | DEFINE_PER_THREAD(int, smp_processor_id); | |
620 | ||
621 | static int smp_processor_id(void) | |
622 | { | |
623 | return __get_thread_var(smp_processor_id); | |
624 | } | |
625 | ||
626 | static void set_smp_processor_id(int cpu) | |
627 | { | |
628 | __get_thread_var(smp_processor_id) = cpu; | |
629 | } | |
630 | ||
631 | #define per_cpu(name, thread) __per_cpu_##name[thread].v | |
632 | #define __get_cpu_var(name) per_cpu(name, smp_processor_id()) | |
633 | ||
634 | #define init_per_cpu(name, v) \ | |
635 | do { \ | |
636 | int __i_p_c_i; \ | |
637 | for (__i_p_c_i = 0; __i_p_c_i < NR_CPUS; __i_p_c_i++) \ | |
638 | per_cpu(name, __i_p_c_i) = v; \ | |
639 | } while (0) | |
640 | ||
641 | /* | |
642 | * CPU state checking (crowbarred). | |
643 | */ | |
644 | ||
645 | #define idle_cpu(cpu) 0 | |
646 | #define in_softirq() 1 | |
647 | #define hardirq_count() 0 | |
648 | #define PREEMPT_SHIFT 0 | |
649 | #define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS) | |
650 | #define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS) | |
651 | #define PREEMPT_BITS 8 | |
652 | #define SOFTIRQ_BITS 8 | |
653 | ||
654 | /* | |
655 | * CPU hotplug. | |
656 | */ | |
657 | ||
658 | struct notifier_block { | |
659 | int (*notifier_call)(struct notifier_block *, unsigned long, void *); | |
660 | struct notifier_block *next; | |
661 | int priority; | |
662 | }; | |
663 | ||
664 | #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */ | |
665 | #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */ | |
666 | #define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */ | |
667 | #define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */ | |
668 | #define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */ | |
669 | #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */ | |
670 | #define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task, | |
671 | * not handling interrupts, soon dead */ | |
672 | #define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug | |
673 | * lock is dropped */ | |
674 | ||
675 | /* Used for CPU hotplug events occuring while tasks are frozen due to a suspend | |
676 | * operation in progress | |
677 | */ | |
678 | #define CPU_TASKS_FROZEN 0x0010 | |
679 | ||
680 | #define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN) | |
681 | #define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN) | |
682 | #define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN) | |
683 | #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN) | |
684 | #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN) | |
685 | #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN) | |
686 | #define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN) | |
687 | ||
688 | /* Hibernation and suspend events */ | |
689 | #define PM_HIBERNATION_PREPARE 0x0001 /* Going to hibernate */ | |
690 | #define PM_POST_HIBERNATION 0x0002 /* Hibernation finished */ | |
691 | #define PM_SUSPEND_PREPARE 0x0003 /* Going to suspend the system */ | |
692 | #define PM_POST_SUSPEND 0x0004 /* Suspend finished */ | |
693 | #define PM_RESTORE_PREPARE 0x0005 /* Going to restore a saved image */ | |
694 | #define PM_POST_RESTORE 0x0006 /* Restore failed */ | |
695 | ||
696 | #define NOTIFY_DONE 0x0000 /* Don't care */ | |
697 | #define NOTIFY_OK 0x0001 /* Suits me */ | |
698 | #define NOTIFY_STOP_MASK 0x8000 /* Don't call further */ | |
699 | #define NOTIFY_BAD (NOTIFY_STOP_MASK|0x0002) | |
700 | /* Bad/Veto action */ | |
701 | /* | |
702 | * Clean way to return from the notifier and stop further calls. | |
703 | */ | |
704 | #define NOTIFY_STOP (NOTIFY_OK|NOTIFY_STOP_MASK) | |
705 | ||
706 | /* | |
707 | * Bug checks. | |
708 | */ | |
709 | ||
710 | #define BUG_ON(c) do { if (!(c)) abort(); } while (0) | |
711 | ||
712 | /* | |
713 | * Initialization -- Must be called before calling any primitives. | |
714 | */ | |
715 | ||
716 | static void smp_init(void) | |
717 | { | |
718 | int i; | |
719 | ||
720 | spin_lock_init(&__thread_id_map_mutex); | |
721 | __thread_id_map[0] = pthread_self(); | |
722 | for (i = 1; i < NR_THREADS; i++) | |
723 | __thread_id_map[i] = __THREAD_ID_MAP_EMPTY; | |
724 | init_per_thread(smp_processor_id, 0); | |
725 | if (pthread_key_create(&thread_id_key, NULL) != 0) { | |
726 | perror("pthread_key_create"); | |
727 | exit(-1); | |
728 | } | |
729 | } | |
730 | ||
731 | /* Taken from the Linux kernel source tree, so GPLv2-only!!! */ | |
732 | ||
733 | #ifndef _LINUX_LIST_H | |
734 | #define _LINUX_LIST_H | |
735 | ||
736 | #define LIST_POISON1 ((void *) 0x00100100) | |
737 | #define LIST_POISON2 ((void *) 0x00200200) | |
738 | ||
739 | #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) | |
740 | #define container_of(ptr, type, member) ({ \ | |
741 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ | |
742 | (type *)( (char *)__mptr - offsetof(type,member) );}) | |
743 | ||
744 | /* | |
745 | * Simple doubly linked list implementation. | |
746 | * | |
747 | * Some of the internal functions ("__xxx") are useful when | |
748 | * manipulating whole lists rather than single entries, as | |
749 | * sometimes we already know the next/prev entries and we can | |
750 | * generate better code by using them directly rather than | |
751 | * using the generic single-entry routines. | |
752 | */ | |
753 | ||
754 | struct list_head { | |
755 | struct list_head *next, *prev; | |
756 | }; | |
757 | ||
758 | #define LIST_HEAD_INIT(name) { &(name), &(name) } | |
759 | ||
760 | #define LIST_HEAD(name) \ | |
761 | struct list_head name = LIST_HEAD_INIT(name) | |
762 | ||
763 | static inline void INIT_LIST_HEAD(struct list_head *list) | |
764 | { | |
765 | list->next = list; | |
766 | list->prev = list; | |
767 | } | |
768 | ||
769 | /* | |
770 | * Insert a new entry between two known consecutive entries. | |
771 | * | |
772 | * This is only for internal list manipulation where we know | |
773 | * the prev/next entries already! | |
774 | */ | |
775 | #ifndef CONFIG_DEBUG_LIST | |
776 | static inline void __list_add(struct list_head *new, | |
777 | struct list_head *prev, | |
778 | struct list_head *next) | |
779 | { | |
780 | next->prev = new; | |
781 | new->next = next; | |
782 | new->prev = prev; | |
783 | prev->next = new; | |
784 | } | |
785 | #else | |
786 | extern void __list_add(struct list_head *new, | |
787 | struct list_head *prev, | |
788 | struct list_head *next); | |
789 | #endif | |
790 | ||
791 | /** | |
792 | * list_add - add a new entry | |
793 | * @new: new entry to be added | |
794 | * @head: list head to add it after | |
795 | * | |
796 | * Insert a new entry after the specified head. | |
797 | * This is good for implementing stacks. | |
798 | */ | |
799 | static inline void list_add(struct list_head *new, struct list_head *head) | |
800 | { | |
801 | __list_add(new, head, head->next); | |
802 | } | |
803 | ||
804 | ||
805 | /** | |
806 | * list_add_tail - add a new entry | |
807 | * @new: new entry to be added | |
808 | * @head: list head to add it before | |
809 | * | |
810 | * Insert a new entry before the specified head. | |
811 | * This is useful for implementing queues. | |
812 | */ | |
813 | static inline void list_add_tail(struct list_head *new, struct list_head *head) | |
814 | { | |
815 | __list_add(new, head->prev, head); | |
816 | } | |
817 | ||
818 | /* | |
819 | * Delete a list entry by making the prev/next entries | |
820 | * point to each other. | |
821 | * | |
822 | * This is only for internal list manipulation where we know | |
823 | * the prev/next entries already! | |
824 | */ | |
825 | static inline void __list_del(struct list_head * prev, struct list_head * next) | |
826 | { | |
827 | next->prev = prev; | |
828 | prev->next = next; | |
829 | } | |
830 | ||
831 | /** | |
832 | * list_del - deletes entry from list. | |
833 | * @entry: the element to delete from the list. | |
834 | * Note: list_empty() on entry does not return true after this, the entry is | |
835 | * in an undefined state. | |
836 | */ | |
837 | #ifndef CONFIG_DEBUG_LIST | |
838 | static inline void list_del(struct list_head *entry) | |
839 | { | |
840 | __list_del(entry->prev, entry->next); | |
841 | entry->next = LIST_POISON1; | |
842 | entry->prev = LIST_POISON2; | |
843 | } | |
844 | #else | |
845 | extern void list_del(struct list_head *entry); | |
846 | #endif | |
847 | ||
848 | /** | |
849 | * list_replace - replace old entry by new one | |
850 | * @old : the element to be replaced | |
851 | * @new : the new element to insert | |
852 | * | |
853 | * If @old was empty, it will be overwritten. | |
854 | */ | |
855 | static inline void list_replace(struct list_head *old, | |
856 | struct list_head *new) | |
857 | { | |
858 | new->next = old->next; | |
859 | new->next->prev = new; | |
860 | new->prev = old->prev; | |
861 | new->prev->next = new; | |
862 | } | |
863 | ||
864 | static inline void list_replace_init(struct list_head *old, | |
865 | struct list_head *new) | |
866 | { | |
867 | list_replace(old, new); | |
868 | INIT_LIST_HEAD(old); | |
869 | } | |
870 | ||
871 | /** | |
872 | * list_del_init - deletes entry from list and reinitialize it. | |
873 | * @entry: the element to delete from the list. | |
874 | */ | |
875 | static inline void list_del_init(struct list_head *entry) | |
876 | { | |
877 | __list_del(entry->prev, entry->next); | |
878 | INIT_LIST_HEAD(entry); | |
879 | } | |
880 | ||
881 | /** | |
882 | * list_move - delete from one list and add as another's head | |
883 | * @list: the entry to move | |
884 | * @head: the head that will precede our entry | |
885 | */ | |
886 | static inline void list_move(struct list_head *list, struct list_head *head) | |
887 | { | |
888 | __list_del(list->prev, list->next); | |
889 | list_add(list, head); | |
890 | } | |
891 | ||
892 | /** | |
893 | * list_move_tail - delete from one list and add as another's tail | |
894 | * @list: the entry to move | |
895 | * @head: the head that will follow our entry | |
896 | */ | |
897 | static inline void list_move_tail(struct list_head *list, | |
898 | struct list_head *head) | |
899 | { | |
900 | __list_del(list->prev, list->next); | |
901 | list_add_tail(list, head); | |
902 | } | |
903 | ||
904 | /** | |
905 | * list_is_last - tests whether @list is the last entry in list @head | |
906 | * @list: the entry to test | |
907 | * @head: the head of the list | |
908 | */ | |
909 | static inline int list_is_last(const struct list_head *list, | |
910 | const struct list_head *head) | |
911 | { | |
912 | return list->next == head; | |
913 | } | |
914 | ||
915 | /** | |
916 | * list_empty - tests whether a list is empty | |
917 | * @head: the list to test. | |
918 | */ | |
919 | static inline int list_empty(const struct list_head *head) | |
920 | { | |
921 | return head->next == head; | |
922 | } | |
923 | ||
924 | /** | |
925 | * list_empty_careful - tests whether a list is empty and not being modified | |
926 | * @head: the list to test | |
927 | * | |
928 | * Description: | |
929 | * tests whether a list is empty _and_ checks that no other CPU might be | |
930 | * in the process of modifying either member (next or prev) | |
931 | * | |
932 | * NOTE: using list_empty_careful() without synchronization | |
933 | * can only be safe if the only activity that can happen | |
934 | * to the list entry is list_del_init(). Eg. it cannot be used | |
935 | * if another CPU could re-list_add() it. | |
936 | */ | |
937 | static inline int list_empty_careful(const struct list_head *head) | |
938 | { | |
939 | struct list_head *next = head->next; | |
940 | return (next == head) && (next == head->prev); | |
941 | } | |
942 | ||
943 | /** | |
944 | * list_is_singular - tests whether a list has just one entry. | |
945 | * @head: the list to test. | |
946 | */ | |
947 | static inline int list_is_singular(const struct list_head *head) | |
948 | { | |
949 | return !list_empty(head) && (head->next == head->prev); | |
950 | } | |
951 | ||
952 | static inline void __list_cut_position(struct list_head *list, | |
953 | struct list_head *head, struct list_head *entry) | |
954 | { | |
955 | struct list_head *new_first = entry->next; | |
956 | list->next = head->next; | |
957 | list->next->prev = list; | |
958 | list->prev = entry; | |
959 | entry->next = list; | |
960 | head->next = new_first; | |
961 | new_first->prev = head; | |
962 | } | |
963 | ||
964 | /** | |
965 | * list_cut_position - cut a list into two | |
966 | * @list: a new list to add all removed entries | |
967 | * @head: a list with entries | |
968 | * @entry: an entry within head, could be the head itself | |
969 | * and if so we won't cut the list | |
970 | * | |
971 | * This helper moves the initial part of @head, up to and | |
972 | * including @entry, from @head to @list. You should | |
973 | * pass on @entry an element you know is on @head. @list | |
974 | * should be an empty list or a list you do not care about | |
975 | * losing its data. | |
976 | * | |
977 | */ | |
978 | static inline void list_cut_position(struct list_head *list, | |
979 | struct list_head *head, struct list_head *entry) | |
980 | { | |
981 | if (list_empty(head)) | |
982 | return; | |
983 | if (list_is_singular(head) && | |
984 | (head->next != entry && head != entry)) | |
985 | return; | |
986 | if (entry == head) | |
987 | INIT_LIST_HEAD(list); | |
988 | else | |
989 | __list_cut_position(list, head, entry); | |
990 | } | |
991 | ||
992 | static inline void __list_splice(const struct list_head *list, | |
993 | struct list_head *prev, | |
994 | struct list_head *next) | |
995 | { | |
996 | struct list_head *first = list->next; | |
997 | struct list_head *last = list->prev; | |
998 | ||
999 | first->prev = prev; | |
1000 | prev->next = first; | |
1001 | ||
1002 | last->next = next; | |
1003 | next->prev = last; | |
1004 | } | |
1005 | ||
1006 | /** | |
1007 | * list_splice - join two lists, this is designed for stacks | |
1008 | * @list: the new list to add. | |
1009 | * @head: the place to add it in the first list. | |
1010 | */ | |
1011 | static inline void list_splice(const struct list_head *list, | |
1012 | struct list_head *head) | |
1013 | { | |
1014 | if (!list_empty(list)) | |
1015 | __list_splice(list, head, head->next); | |
1016 | } | |
1017 | ||
1018 | /** | |
1019 | * list_splice_tail - join two lists, each list being a queue | |
1020 | * @list: the new list to add. | |
1021 | * @head: the place to add it in the first list. | |
1022 | */ | |
1023 | static inline void list_splice_tail(struct list_head *list, | |
1024 | struct list_head *head) | |
1025 | { | |
1026 | if (!list_empty(list)) | |
1027 | __list_splice(list, head->prev, head); | |
1028 | } | |
1029 | ||
1030 | /** | |
1031 | * list_splice_init - join two lists and reinitialise the emptied list. | |
1032 | * @list: the new list to add. | |
1033 | * @head: the place to add it in the first list. | |
1034 | * | |
1035 | * The list at @list is reinitialised | |
1036 | */ | |
1037 | static inline void list_splice_init(struct list_head *list, | |
1038 | struct list_head *head) | |
1039 | { | |
1040 | if (!list_empty(list)) { | |
1041 | __list_splice(list, head, head->next); | |
1042 | INIT_LIST_HEAD(list); | |
1043 | } | |
1044 | } | |
1045 | ||
1046 | /** | |
1047 | * list_splice_tail_init - join two lists and reinitialise the emptied list | |
1048 | * @list: the new list to add. | |
1049 | * @head: the place to add it in the first list. | |
1050 | * | |
1051 | * Each of the lists is a queue. | |
1052 | * The list at @list is reinitialised | |
1053 | */ | |
1054 | static inline void list_splice_tail_init(struct list_head *list, | |
1055 | struct list_head *head) | |
1056 | { | |
1057 | if (!list_empty(list)) { | |
1058 | __list_splice(list, head->prev, head); | |
1059 | INIT_LIST_HEAD(list); | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | /** | |
1064 | * list_entry - get the struct for this entry | |
1065 | * @ptr: the &struct list_head pointer. | |
1066 | * @type: the type of the struct this is embedded in. | |
1067 | * @member: the name of the list_struct within the struct. | |
1068 | */ | |
1069 | #define list_entry(ptr, type, member) \ | |
1070 | container_of(ptr, type, member) | |
1071 | ||
1072 | /** | |
1073 | * list_first_entry - get the first element from a list | |
1074 | * @ptr: the list head to take the element from. | |
1075 | * @type: the type of the struct this is embedded in. | |
1076 | * @member: the name of the list_struct within the struct. | |
1077 | * | |
1078 | * Note, that list is expected to be not empty. | |
1079 | */ | |
1080 | #define list_first_entry(ptr, type, member) \ | |
1081 | list_entry((ptr)->next, type, member) | |
1082 | ||
1083 | /** | |
1084 | * list_for_each - iterate over a list | |
1085 | * @pos: the &struct list_head to use as a loop cursor. | |
1086 | * @head: the head for your list. | |
1087 | */ | |
1088 | #define list_for_each(pos, head) \ | |
1089 | for (pos = (head)->next; prefetch(pos->next), pos != (head); \ | |
1090 | pos = pos->next) | |
1091 | ||
1092 | /** | |
1093 | * __list_for_each - iterate over a list | |
1094 | * @pos: the &struct list_head to use as a loop cursor. | |
1095 | * @head: the head for your list. | |
1096 | * | |
1097 | * This variant differs from list_for_each() in that it's the | |
1098 | * simplest possible list iteration code, no prefetching is done. | |
1099 | * Use this for code that knows the list to be very short (empty | |
1100 | * or 1 entry) most of the time. | |
1101 | */ | |
1102 | #define __list_for_each(pos, head) \ | |
1103 | for (pos = (head)->next; pos != (head); pos = pos->next) | |
1104 | ||
1105 | /** | |
1106 | * list_for_each_prev - iterate over a list backwards | |
1107 | * @pos: the &struct list_head to use as a loop cursor. | |
1108 | * @head: the head for your list. | |
1109 | */ | |
1110 | #define list_for_each_prev(pos, head) \ | |
1111 | for (pos = (head)->prev; prefetch(pos->prev), pos != (head); \ | |
1112 | pos = pos->prev) | |
1113 | ||
1114 | /** | |
1115 | * list_for_each_safe - iterate over a list safe against removal of list entry | |
1116 | * @pos: the &struct list_head to use as a loop cursor. | |
1117 | * @n: another &struct list_head to use as temporary storage | |
1118 | * @head: the head for your list. | |
1119 | */ | |
1120 | #define list_for_each_safe(pos, n, head) \ | |
1121 | for (pos = (head)->next, n = pos->next; pos != (head); \ | |
1122 | pos = n, n = pos->next) | |
1123 | ||
1124 | /** | |
1125 | * list_for_each_prev_safe - iterate over a list backwards safe against removal of list entry | |
1126 | * @pos: the &struct list_head to use as a loop cursor. | |
1127 | * @n: another &struct list_head to use as temporary storage | |
1128 | * @head: the head for your list. | |
1129 | */ | |
1130 | #define list_for_each_prev_safe(pos, n, head) \ | |
1131 | for (pos = (head)->prev, n = pos->prev; \ | |
1132 | prefetch(pos->prev), pos != (head); \ | |
1133 | pos = n, n = pos->prev) | |
1134 | ||
1135 | /** | |
1136 | * list_for_each_entry - iterate over list of given type | |
1137 | * @pos: the type * to use as a loop cursor. | |
1138 | * @head: the head for your list. | |
1139 | * @member: the name of the list_struct within the struct. | |
1140 | */ | |
1141 | #define list_for_each_entry(pos, head, member) \ | |
1142 | for (pos = list_entry((head)->next, typeof(*pos), member); \ | |
1143 | prefetch(pos->member.next), &pos->member != (head); \ | |
1144 | pos = list_entry(pos->member.next, typeof(*pos), member)) | |
1145 | ||
1146 | /** | |
1147 | * list_for_each_entry_reverse - iterate backwards over list of given type. | |
1148 | * @pos: the type * to use as a loop cursor. | |
1149 | * @head: the head for your list. | |
1150 | * @member: the name of the list_struct within the struct. | |
1151 | */ | |
1152 | #define list_for_each_entry_reverse(pos, head, member) \ | |
1153 | for (pos = list_entry((head)->prev, typeof(*pos), member); \ | |
1154 | prefetch(pos->member.prev), &pos->member != (head); \ | |
1155 | pos = list_entry(pos->member.prev, typeof(*pos), member)) | |
1156 | ||
1157 | /** | |
1158 | * list_prepare_entry - prepare a pos entry for use in list_for_each_entry_continue() | |
1159 | * @pos: the type * to use as a start point | |
1160 | * @head: the head of the list | |
1161 | * @member: the name of the list_struct within the struct. | |
1162 | * | |
1163 | * Prepares a pos entry for use as a start point in list_for_each_entry_continue(). | |
1164 | */ | |
1165 | #define list_prepare_entry(pos, head, member) \ | |
1166 | ((pos) ? : list_entry(head, typeof(*pos), member)) | |
1167 | ||
1168 | /** | |
1169 | * list_for_each_entry_continue - continue iteration over list of given type | |
1170 | * @pos: the type * to use as a loop cursor. | |
1171 | * @head: the head for your list. | |
1172 | * @member: the name of the list_struct within the struct. | |
1173 | * | |
1174 | * Continue to iterate over list of given type, continuing after | |
1175 | * the current position. | |
1176 | */ | |
1177 | #define list_for_each_entry_continue(pos, head, member) \ | |
1178 | for (pos = list_entry(pos->member.next, typeof(*pos), member); \ | |
1179 | prefetch(pos->member.next), &pos->member != (head); \ | |
1180 | pos = list_entry(pos->member.next, typeof(*pos), member)) | |
1181 | ||
1182 | /** | |
1183 | * list_for_each_entry_continue_reverse - iterate backwards from the given point | |
1184 | * @pos: the type * to use as a loop cursor. | |
1185 | * @head: the head for your list. | |
1186 | * @member: the name of the list_struct within the struct. | |
1187 | * | |
1188 | * Start to iterate over list of given type backwards, continuing after | |
1189 | * the current position. | |
1190 | */ | |
1191 | #define list_for_each_entry_continue_reverse(pos, head, member) \ | |
1192 | for (pos = list_entry(pos->member.prev, typeof(*pos), member); \ | |
1193 | prefetch(pos->member.prev), &pos->member != (head); \ | |
1194 | pos = list_entry(pos->member.prev, typeof(*pos), member)) | |
1195 | ||
1196 | /** | |
1197 | * list_for_each_entry_from - iterate over list of given type from the current point | |
1198 | * @pos: the type * to use as a loop cursor. | |
1199 | * @head: the head for your list. | |
1200 | * @member: the name of the list_struct within the struct. | |
1201 | * | |
1202 | * Iterate over list of given type, continuing from current position. | |
1203 | */ | |
1204 | #define list_for_each_entry_from(pos, head, member) \ | |
1205 | for (; prefetch(pos->member.next), &pos->member != (head); \ | |
1206 | pos = list_entry(pos->member.next, typeof(*pos), member)) | |
1207 | ||
1208 | /** | |
1209 | * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry | |
1210 | * @pos: the type * to use as a loop cursor. | |
1211 | * @n: another type * to use as temporary storage | |
1212 | * @head: the head for your list. | |
1213 | * @member: the name of the list_struct within the struct. | |
1214 | */ | |
1215 | #define list_for_each_entry_safe(pos, n, head, member) \ | |
1216 | for (pos = list_entry((head)->next, typeof(*pos), member), \ | |
1217 | n = list_entry(pos->member.next, typeof(*pos), member); \ | |
1218 | &pos->member != (head); \ | |
1219 | pos = n, n = list_entry(n->member.next, typeof(*n), member)) | |
1220 | ||
1221 | /** | |
1222 | * list_for_each_entry_safe_continue | |
1223 | * @pos: the type * to use as a loop cursor. | |
1224 | * @n: another type * to use as temporary storage | |
1225 | * @head: the head for your list. | |
1226 | * @member: the name of the list_struct within the struct. | |
1227 | * | |
1228 | * Iterate over list of given type, continuing after current point, | |
1229 | * safe against removal of list entry. | |
1230 | */ | |
1231 | #define list_for_each_entry_safe_continue(pos, n, head, member) \ | |
1232 | for (pos = list_entry(pos->member.next, typeof(*pos), member), \ | |
1233 | n = list_entry(pos->member.next, typeof(*pos), member); \ | |
1234 | &pos->member != (head); \ | |
1235 | pos = n, n = list_entry(n->member.next, typeof(*n), member)) | |
1236 | ||
1237 | /** | |
1238 | * list_for_each_entry_safe_from | |
1239 | * @pos: the type * to use as a loop cursor. | |
1240 | * @n: another type * to use as temporary storage | |
1241 | * @head: the head for your list. | |
1242 | * @member: the name of the list_struct within the struct. | |
1243 | * | |
1244 | * Iterate over list of given type from current point, safe against | |
1245 | * removal of list entry. | |
1246 | */ | |
1247 | #define list_for_each_entry_safe_from(pos, n, head, member) \ | |
1248 | for (n = list_entry(pos->member.next, typeof(*pos), member); \ | |
1249 | &pos->member != (head); \ | |
1250 | pos = n, n = list_entry(n->member.next, typeof(*n), member)) | |
1251 | ||
1252 | /** | |
1253 | * list_for_each_entry_safe_reverse | |
1254 | * @pos: the type * to use as a loop cursor. | |
1255 | * @n: another type * to use as temporary storage | |
1256 | * @head: the head for your list. | |
1257 | * @member: the name of the list_struct within the struct. | |
1258 | * | |
1259 | * Iterate backwards over list of given type, safe against removal | |
1260 | * of list entry. | |
1261 | */ | |
1262 | #define list_for_each_entry_safe_reverse(pos, n, head, member) \ | |
1263 | for (pos = list_entry((head)->prev, typeof(*pos), member), \ | |
1264 | n = list_entry(pos->member.prev, typeof(*pos), member); \ | |
1265 | &pos->member != (head); \ | |
1266 | pos = n, n = list_entry(n->member.prev, typeof(*n), member)) | |
1267 | ||
1268 | /* | |
1269 | * Double linked lists with a single pointer list head. | |
1270 | * Mostly useful for hash tables where the two pointer list head is | |
1271 | * too wasteful. | |
1272 | * You lose the ability to access the tail in O(1). | |
1273 | */ | |
1274 | ||
1275 | struct hlist_head { | |
1276 | struct hlist_node *first; | |
1277 | }; | |
1278 | ||
1279 | struct hlist_node { | |
1280 | struct hlist_node *next, **pprev; | |
1281 | }; | |
1282 | ||
1283 | #define HLIST_HEAD_INIT { .first = NULL } | |
1284 | #define HLIST_HEAD(name) struct hlist_head name = { .first = NULL } | |
1285 | #define INIT_HLIST_HEAD(ptr) ((ptr)->first = NULL) | |
1286 | static inline void INIT_HLIST_NODE(struct hlist_node *h) | |
1287 | { | |
1288 | h->next = NULL; | |
1289 | h->pprev = NULL; | |
1290 | } | |
1291 | ||
1292 | static inline int hlist_unhashed(const struct hlist_node *h) | |
1293 | { | |
1294 | return !h->pprev; | |
1295 | } | |
1296 | ||
1297 | static inline int hlist_empty(const struct hlist_head *h) | |
1298 | { | |
1299 | return !h->first; | |
1300 | } | |
1301 | ||
1302 | static inline void __hlist_del(struct hlist_node *n) | |
1303 | { | |
1304 | struct hlist_node *next = n->next; | |
1305 | struct hlist_node **pprev = n->pprev; | |
1306 | *pprev = next; | |
1307 | if (next) | |
1308 | next->pprev = pprev; | |
1309 | } | |
1310 | ||
1311 | static inline void hlist_del(struct hlist_node *n) | |
1312 | { | |
1313 | __hlist_del(n); | |
1314 | n->next = LIST_POISON1; | |
1315 | n->pprev = LIST_POISON2; | |
1316 | } | |
1317 | ||
1318 | static inline void hlist_del_init(struct hlist_node *n) | |
1319 | { | |
1320 | if (!hlist_unhashed(n)) { | |
1321 | __hlist_del(n); | |
1322 | INIT_HLIST_NODE(n); | |
1323 | } | |
1324 | } | |
1325 | ||
1326 | static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h) | |
1327 | { | |
1328 | struct hlist_node *first = h->first; | |
1329 | n->next = first; | |
1330 | if (first) | |
1331 | first->pprev = &n->next; | |
1332 | h->first = n; | |
1333 | n->pprev = &h->first; | |
1334 | } | |
1335 | ||
1336 | /* next must be != NULL */ | |
1337 | static inline void hlist_add_before(struct hlist_node *n, | |
1338 | struct hlist_node *next) | |
1339 | { | |
1340 | n->pprev = next->pprev; | |
1341 | n->next = next; | |
1342 | next->pprev = &n->next; | |
1343 | *(n->pprev) = n; | |
1344 | } | |
1345 | ||
1346 | static inline void hlist_add_after(struct hlist_node *n, | |
1347 | struct hlist_node *next) | |
1348 | { | |
1349 | next->next = n->next; | |
1350 | n->next = next; | |
1351 | next->pprev = &n->next; | |
1352 | ||
1353 | if(next->next) | |
1354 | next->next->pprev = &next->next; | |
1355 | } | |
1356 | ||
1357 | /* | |
1358 | * Move a list from one list head to another. Fixup the pprev | |
1359 | * reference of the first entry if it exists. | |
1360 | */ | |
1361 | static inline void hlist_move_list(struct hlist_head *old, | |
1362 | struct hlist_head *new) | |
1363 | { | |
1364 | new->first = old->first; | |
1365 | if (new->first) | |
1366 | new->first->pprev = &new->first; | |
1367 | old->first = NULL; | |
1368 | } | |
1369 | ||
1370 | #define hlist_entry(ptr, type, member) container_of(ptr,type,member) | |
1371 | ||
1372 | #define hlist_for_each(pos, head) \ | |
1373 | for (pos = (head)->first; pos && ({ prefetch(pos->next); 1; }); \ | |
1374 | pos = pos->next) | |
1375 | ||
1376 | #define hlist_for_each_safe(pos, n, head) \ | |
1377 | for (pos = (head)->first; pos && ({ n = pos->next; 1; }); \ | |
1378 | pos = n) | |
1379 | ||
1380 | /** | |
1381 | * hlist_for_each_entry - iterate over list of given type | |
1382 | * @tpos: the type * to use as a loop cursor. | |
1383 | * @pos: the &struct hlist_node to use as a loop cursor. | |
1384 | * @head: the head for your list. | |
1385 | * @member: the name of the hlist_node within the struct. | |
1386 | */ | |
1387 | #define hlist_for_each_entry(tpos, pos, head, member) \ | |
1388 | for (pos = (head)->first; \ | |
1389 | pos && ({ prefetch(pos->next); 1;}) && \ | |
1390 | ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ | |
1391 | pos = pos->next) | |
1392 | ||
1393 | /** | |
1394 | * hlist_for_each_entry_continue - iterate over a hlist continuing after current point | |
1395 | * @tpos: the type * to use as a loop cursor. | |
1396 | * @pos: the &struct hlist_node to use as a loop cursor. | |
1397 | * @member: the name of the hlist_node within the struct. | |
1398 | */ | |
1399 | #define hlist_for_each_entry_continue(tpos, pos, member) \ | |
1400 | for (pos = (pos)->next; \ | |
1401 | pos && ({ prefetch(pos->next); 1;}) && \ | |
1402 | ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ | |
1403 | pos = pos->next) | |
1404 | ||
1405 | /** | |
1406 | * hlist_for_each_entry_from - iterate over a hlist continuing from current point | |
1407 | * @tpos: the type * to use as a loop cursor. | |
1408 | * @pos: the &struct hlist_node to use as a loop cursor. | |
1409 | * @member: the name of the hlist_node within the struct. | |
1410 | */ | |
1411 | #define hlist_for_each_entry_from(tpos, pos, member) \ | |
1412 | for (; pos && ({ prefetch(pos->next); 1;}) && \ | |
1413 | ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ | |
1414 | pos = pos->next) | |
1415 | ||
1416 | /** | |
1417 | * hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry | |
1418 | * @tpos: the type * to use as a loop cursor. | |
1419 | * @pos: the &struct hlist_node to use as a loop cursor. | |
1420 | * @n: another &struct hlist_node to use as temporary storage | |
1421 | * @head: the head for your list. | |
1422 | * @member: the name of the hlist_node within the struct. | |
1423 | */ | |
1424 | #define hlist_for_each_entry_safe(tpos, pos, n, head, member) \ | |
1425 | for (pos = (head)->first; \ | |
1426 | pos && ({ n = pos->next; 1; }) && \ | |
1427 | ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \ | |
1428 | pos = n) | |
1429 | ||
1430 | #endif |