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b2441318 1/* SPDX-License-Identifier: GPL-2.0 */
acac43e2 2/* Atomic operations usable in machine independent code */
3f9d35b9
ED		 3#ifndef _LINUX_ATOMIC_H
4#define _LINUX_ATOMIC_H
5#include <asm/atomic.h>
654672d4
WD		 6#include <asm/barrier.h>
7
8/*
9 * Relaxed variants of xchg, cmpxchg and some atomic operations.
10 *
11 * We support four variants:
12 *
13 * - Fully ordered: The default implementation, no suffix required.
14 * - Acquire: Provides ACQUIRE semantics, _acquire suffix.
15 * - Release: Provides RELEASE semantics, _release suffix.
16 * - Relaxed: No ordering guarantees, _relaxed suffix.
17 *
18 * For compound atomics performing both a load and a store, ACQUIRE
19 * semantics apply only to the load and RELEASE semantics only to the
20 * store portion of the operation. Note that a failed cmpxchg_acquire
21 * does -not- imply any memory ordering constraints.
22 *
23 * See Documentation/memory-barriers.txt for ACQUIRE/RELEASE definitions.
24 */
25
26#ifndef atomic_read_acquire
27#define atomic_read_acquire(v) smp_load_acquire(&(v)->counter)
28#endif
29
30#ifndef atomic_set_release
31#define atomic_set_release(v, i) smp_store_release(&(v)->counter, (i))
32#endif
33
34/*
35 * The idea here is to build acquire/release variants by adding explicit
36 * barriers on top of the relaxed variant. In the case where the relaxed
37 * variant is already fully ordered, no additional barriers are needed.
e1ab7f39
BF		 38 *
39 * Besides, if an arch has a special barrier for acquire/release, it could
40 * implement its own __atomic_op_* and use the same framework for building
41 * variants
d89e588c
PZ		 42 *
43 * If an architecture overrides __atomic_op_acquire() it will probably want
44 * to define smp_mb__after_spinlock().
654672d4 45 */
e1ab7f39 46#ifndef __atomic_op_acquire
654672d4
WD		 47#define __atomic_op_acquire(op, args...) \
48({ \
49 typeof(op##_relaxed(args)) __ret = op##_relaxed(args); \
50 smp_mb__after_atomic(); \
51 __ret; \
52})
e1ab7f39 53#endif
654672d4 54
e1ab7f39 55#ifndef __atomic_op_release
654672d4
WD		 56#define __atomic_op_release(op, args...) \
57({ \
58 smp_mb__before_atomic(); \
59 op##_relaxed(args); \
60})
e1ab7f39 61#endif
654672d4 62
e1ab7f39 63#ifndef __atomic_op_fence
654672d4
WD		 64#define __atomic_op_fence(op, args...) \
65({ \
66 typeof(op##_relaxed(args)) __ret; \
67 smp_mb__before_atomic(); \
68 __ret = op##_relaxed(args); \
69 smp_mb__after_atomic(); \
70 __ret; \
71})
e1ab7f39 72#endif
654672d4
WD		 73
74/* atomic_add_return_relaxed */
75#ifndef atomic_add_return_relaxed
76#define atomic_add_return_relaxed atomic_add_return
77#define atomic_add_return_acquire atomic_add_return
78#define atomic_add_return_release atomic_add_return
79
80#else /* atomic_add_return_relaxed */
81
82#ifndef atomic_add_return_acquire
83#define atomic_add_return_acquire(...) \
84 __atomic_op_acquire(atomic_add_return, __VA_ARGS__)
85#endif
86
87#ifndef atomic_add_return_release
88#define atomic_add_return_release(...) \
89 __atomic_op_release(atomic_add_return, __VA_ARGS__)
90#endif
91
92#ifndef atomic_add_return
93#define atomic_add_return(...) \
94 __atomic_op_fence(atomic_add_return, __VA_ARGS__)
95#endif
96#endif /* atomic_add_return_relaxed */
97
63ab7bd0
DB		 98/* atomic_inc_return_relaxed */
99#ifndef atomic_inc_return_relaxed
100#define atomic_inc_return_relaxed atomic_inc_return
101#define atomic_inc_return_acquire atomic_inc_return
102#define atomic_inc_return_release atomic_inc_return
103
104#else /* atomic_inc_return_relaxed */
105
106#ifndef atomic_inc_return_acquire
107#define atomic_inc_return_acquire(...) \
108 __atomic_op_acquire(atomic_inc_return, __VA_ARGS__)
109#endif
110
111#ifndef atomic_inc_return_release
112#define atomic_inc_return_release(...) \
113 __atomic_op_release(atomic_inc_return, __VA_ARGS__)
114#endif
115
116#ifndef atomic_inc_return
117#define atomic_inc_return(...) \
118 __atomic_op_fence(atomic_inc_return, __VA_ARGS__)
119#endif
120#endif /* atomic_inc_return_relaxed */
121
654672d4
WD		 122/* atomic_sub_return_relaxed */
123#ifndef atomic_sub_return_relaxed
124#define atomic_sub_return_relaxed atomic_sub_return
125#define atomic_sub_return_acquire atomic_sub_return
126#define atomic_sub_return_release atomic_sub_return
127
128#else /* atomic_sub_return_relaxed */
129
130#ifndef atomic_sub_return_acquire
131#define atomic_sub_return_acquire(...) \
132 __atomic_op_acquire(atomic_sub_return, __VA_ARGS__)
133#endif
134
135#ifndef atomic_sub_return_release
136#define atomic_sub_return_release(...) \
137 __atomic_op_release(atomic_sub_return, __VA_ARGS__)
138#endif
139
140#ifndef atomic_sub_return
141#define atomic_sub_return(...) \
142 __atomic_op_fence(atomic_sub_return, __VA_ARGS__)
143#endif
144#endif /* atomic_sub_return_relaxed */
145
63ab7bd0
DB		 146/* atomic_dec_return_relaxed */
147#ifndef atomic_dec_return_relaxed
148#define atomic_dec_return_relaxed atomic_dec_return
149#define atomic_dec_return_acquire atomic_dec_return
150#define atomic_dec_return_release atomic_dec_return
151
152#else /* atomic_dec_return_relaxed */
153
154#ifndef atomic_dec_return_acquire
155#define atomic_dec_return_acquire(...) \
156 __atomic_op_acquire(atomic_dec_return, __VA_ARGS__)
157#endif
158
159#ifndef atomic_dec_return_release
160#define atomic_dec_return_release(...) \
161 __atomic_op_release(atomic_dec_return, __VA_ARGS__)
162#endif
163
164#ifndef atomic_dec_return
165#define atomic_dec_return(...) \
166 __atomic_op_fence(atomic_dec_return, __VA_ARGS__)
167#endif
168#endif /* atomic_dec_return_relaxed */
169
28aa2bda
PZ		 170
171/* atomic_fetch_add_relaxed */
172#ifndef atomic_fetch_add_relaxed
173#define atomic_fetch_add_relaxed atomic_fetch_add
174#define atomic_fetch_add_acquire atomic_fetch_add
175#define atomic_fetch_add_release atomic_fetch_add
176
177#else /* atomic_fetch_add_relaxed */
178
179#ifndef atomic_fetch_add_acquire
180#define atomic_fetch_add_acquire(...) \
181 __atomic_op_acquire(atomic_fetch_add, __VA_ARGS__)
182#endif
183
184#ifndef atomic_fetch_add_release
185#define atomic_fetch_add_release(...) \
186 __atomic_op_release(atomic_fetch_add, __VA_ARGS__)
187#endif
188
189#ifndef atomic_fetch_add
190#define atomic_fetch_add(...) \
191 __atomic_op_fence(atomic_fetch_add, __VA_ARGS__)
192#endif
193#endif /* atomic_fetch_add_relaxed */
194
f0662863
DB		 195/* atomic_fetch_inc_relaxed */
196#ifndef atomic_fetch_inc_relaxed
197
198#ifndef atomic_fetch_inc
199#define atomic_fetch_inc(v) atomic_fetch_add(1, (v))
200#define atomic_fetch_inc_relaxed(v) atomic_fetch_add_relaxed(1, (v))
201#define atomic_fetch_inc_acquire(v) atomic_fetch_add_acquire(1, (v))
202#define atomic_fetch_inc_release(v) atomic_fetch_add_release(1, (v))
203#else /* atomic_fetch_inc */
204#define atomic_fetch_inc_relaxed atomic_fetch_inc
205#define atomic_fetch_inc_acquire atomic_fetch_inc
206#define atomic_fetch_inc_release atomic_fetch_inc
207#endif /* atomic_fetch_inc */
208
209#else /* atomic_fetch_inc_relaxed */
210
211#ifndef atomic_fetch_inc_acquire
212#define atomic_fetch_inc_acquire(...) \
213 __atomic_op_acquire(atomic_fetch_inc, __VA_ARGS__)
214#endif
215
216#ifndef atomic_fetch_inc_release
217#define atomic_fetch_inc_release(...) \
218 __atomic_op_release(atomic_fetch_inc, __VA_ARGS__)
219#endif
220
221#ifndef atomic_fetch_inc
222#define atomic_fetch_inc(...) \
223 __atomic_op_fence(atomic_fetch_inc, __VA_ARGS__)
224#endif
225#endif /* atomic_fetch_inc_relaxed */
226
28aa2bda
PZ		 227/* atomic_fetch_sub_relaxed */
228#ifndef atomic_fetch_sub_relaxed
229#define atomic_fetch_sub_relaxed atomic_fetch_sub
230#define atomic_fetch_sub_acquire atomic_fetch_sub
231#define atomic_fetch_sub_release atomic_fetch_sub
232
233#else /* atomic_fetch_sub_relaxed */
234
235#ifndef atomic_fetch_sub_acquire
236#define atomic_fetch_sub_acquire(...) \
237 __atomic_op_acquire(atomic_fetch_sub, __VA_ARGS__)
238#endif
239
240#ifndef atomic_fetch_sub_release
241#define atomic_fetch_sub_release(...) \
242 __atomic_op_release(atomic_fetch_sub, __VA_ARGS__)
243#endif
244
245#ifndef atomic_fetch_sub
246#define atomic_fetch_sub(...) \
247 __atomic_op_fence(atomic_fetch_sub, __VA_ARGS__)
248#endif
249#endif /* atomic_fetch_sub_relaxed */
250
f0662863
DB		 251/* atomic_fetch_dec_relaxed */
252#ifndef atomic_fetch_dec_relaxed
253
254#ifndef atomic_fetch_dec
255#define atomic_fetch_dec(v) atomic_fetch_sub(1, (v))
256#define atomic_fetch_dec_relaxed(v) atomic_fetch_sub_relaxed(1, (v))
257#define atomic_fetch_dec_acquire(v) atomic_fetch_sub_acquire(1, (v))
258#define atomic_fetch_dec_release(v) atomic_fetch_sub_release(1, (v))
259#else /* atomic_fetch_dec */
260#define atomic_fetch_dec_relaxed atomic_fetch_dec
261#define atomic_fetch_dec_acquire atomic_fetch_dec
262#define atomic_fetch_dec_release atomic_fetch_dec
263#endif /* atomic_fetch_dec */
264
265#else /* atomic_fetch_dec_relaxed */
266
267#ifndef atomic_fetch_dec_acquire
268#define atomic_fetch_dec_acquire(...) \
269 __atomic_op_acquire(atomic_fetch_dec, __VA_ARGS__)
270#endif
271
272#ifndef atomic_fetch_dec_release
273#define atomic_fetch_dec_release(...) \
274 __atomic_op_release(atomic_fetch_dec, __VA_ARGS__)
275#endif
276
277#ifndef atomic_fetch_dec
278#define atomic_fetch_dec(...) \
279 __atomic_op_fence(atomic_fetch_dec, __VA_ARGS__)
280#endif
281#endif /* atomic_fetch_dec_relaxed */
282
28aa2bda
PZ		 283/* atomic_fetch_or_relaxed */
284#ifndef atomic_fetch_or_relaxed
285#define atomic_fetch_or_relaxed atomic_fetch_or
286#define atomic_fetch_or_acquire atomic_fetch_or
287#define atomic_fetch_or_release atomic_fetch_or
288
289#else /* atomic_fetch_or_relaxed */
290
291#ifndef atomic_fetch_or_acquire
292#define atomic_fetch_or_acquire(...) \
293 __atomic_op_acquire(atomic_fetch_or, __VA_ARGS__)
294#endif
295
296#ifndef atomic_fetch_or_release
297#define atomic_fetch_or_release(...) \
298 __atomic_op_release(atomic_fetch_or, __VA_ARGS__)
299#endif
300
301#ifndef atomic_fetch_or
302#define atomic_fetch_or(...) \
303 __atomic_op_fence(atomic_fetch_or, __VA_ARGS__)
304#endif
305#endif /* atomic_fetch_or_relaxed */
306
307/* atomic_fetch_and_relaxed */
308#ifndef atomic_fetch_and_relaxed
309#define atomic_fetch_and_relaxed atomic_fetch_and
310#define atomic_fetch_and_acquire atomic_fetch_and
311#define atomic_fetch_and_release atomic_fetch_and
312
313#else /* atomic_fetch_and_relaxed */
314
315#ifndef atomic_fetch_and_acquire
316#define atomic_fetch_and_acquire(...) \
317 __atomic_op_acquire(atomic_fetch_and, __VA_ARGS__)
318#endif
319
320#ifndef atomic_fetch_and_release
321#define atomic_fetch_and_release(...) \
322 __atomic_op_release(atomic_fetch_and, __VA_ARGS__)
323#endif
324
325#ifndef atomic_fetch_and
326#define atomic_fetch_and(...) \
327 __atomic_op_fence(atomic_fetch_and, __VA_ARGS__)
328#endif
329#endif /* atomic_fetch_and_relaxed */
330
331#ifdef atomic_andnot
332/* atomic_fetch_andnot_relaxed */
333#ifndef atomic_fetch_andnot_relaxed
334#define atomic_fetch_andnot_relaxed atomic_fetch_andnot
335#define atomic_fetch_andnot_acquire atomic_fetch_andnot
336#define atomic_fetch_andnot_release atomic_fetch_andnot
337
338#else /* atomic_fetch_andnot_relaxed */
339
340#ifndef atomic_fetch_andnot_acquire
341#define atomic_fetch_andnot_acquire(...) \
342 __atomic_op_acquire(atomic_fetch_andnot, __VA_ARGS__)
343#endif
344
345#ifndef atomic_fetch_andnot_release
346#define atomic_fetch_andnot_release(...) \
347 __atomic_op_release(atomic_fetch_andnot, __VA_ARGS__)
348#endif
349
350#ifndef atomic_fetch_andnot
351#define atomic_fetch_andnot(...) \
352 __atomic_op_fence(atomic_fetch_andnot, __VA_ARGS__)
353#endif
354#endif /* atomic_fetch_andnot_relaxed */
355#endif /* atomic_andnot */
356
357/* atomic_fetch_xor_relaxed */
358#ifndef atomic_fetch_xor_relaxed
359#define atomic_fetch_xor_relaxed atomic_fetch_xor
360#define atomic_fetch_xor_acquire atomic_fetch_xor
361#define atomic_fetch_xor_release atomic_fetch_xor
362
363#else /* atomic_fetch_xor_relaxed */
364
365#ifndef atomic_fetch_xor_acquire
366#define atomic_fetch_xor_acquire(...) \
367 __atomic_op_acquire(atomic_fetch_xor, __VA_ARGS__)
368#endif
369
370#ifndef atomic_fetch_xor_release
371#define atomic_fetch_xor_release(...) \
372 __atomic_op_release(atomic_fetch_xor, __VA_ARGS__)
373#endif
374
375#ifndef atomic_fetch_xor
376#define atomic_fetch_xor(...) \
377 __atomic_op_fence(atomic_fetch_xor, __VA_ARGS__)
378#endif
379#endif /* atomic_fetch_xor_relaxed */
380
381
654672d4
WD		 382/* atomic_xchg_relaxed */
383#ifndef atomic_xchg_relaxed
384#define atomic_xchg_relaxed atomic_xchg
385#define atomic_xchg_acquire atomic_xchg
386#define atomic_xchg_release atomic_xchg
387
388#else /* atomic_xchg_relaxed */
389
390#ifndef atomic_xchg_acquire
391#define atomic_xchg_acquire(...) \
392 __atomic_op_acquire(atomic_xchg, __VA_ARGS__)
393#endif
394
395#ifndef atomic_xchg_release
396#define atomic_xchg_release(...) \
397 __atomic_op_release(atomic_xchg, __VA_ARGS__)
398#endif
399
400#ifndef atomic_xchg
401#define atomic_xchg(...) \
402 __atomic_op_fence(atomic_xchg, __VA_ARGS__)
403#endif
404#endif /* atomic_xchg_relaxed */
405
406/* atomic_cmpxchg_relaxed */
407#ifndef atomic_cmpxchg_relaxed
408#define atomic_cmpxchg_relaxed atomic_cmpxchg
409#define atomic_cmpxchg_acquire atomic_cmpxchg
410#define atomic_cmpxchg_release atomic_cmpxchg
411
412#else /* atomic_cmpxchg_relaxed */
413
414#ifndef atomic_cmpxchg_acquire
415#define atomic_cmpxchg_acquire(...) \
416 __atomic_op_acquire(atomic_cmpxchg, __VA_ARGS__)
417#endif
418
419#ifndef atomic_cmpxchg_release
420#define atomic_cmpxchg_release(...) \
421 __atomic_op_release(atomic_cmpxchg, __VA_ARGS__)
422#endif
423
424#ifndef atomic_cmpxchg
425#define atomic_cmpxchg(...) \
426 __atomic_op_fence(atomic_cmpxchg, __VA_ARGS__)
427#endif
428#endif /* atomic_cmpxchg_relaxed */
429
a9ebf306
PZ		 430#ifndef atomic_try_cmpxchg
431
432#define __atomic_try_cmpxchg(type, _p, _po, _n) \
433({ \
434 typeof(_po) __po = (_po); \
44fe8445
PZ		 435 typeof(*(_po)) __r, __o = *__po; \
436 __r = atomic_cmpxchg##type((_p), __o, (_n)); \
437 if (unlikely(__r != __o)) \
438 *__po = __r; \
439 likely(__r == __o); \
a9ebf306
PZ		 440})
441
442#define atomic_try_cmpxchg(_p, _po, _n) __atomic_try_cmpxchg(, _p, _po, _n)
443#define atomic_try_cmpxchg_relaxed(_p, _po, _n) __atomic_try_cmpxchg(_relaxed, _p, _po, _n)
444#define atomic_try_cmpxchg_acquire(_p, _po, _n) __atomic_try_cmpxchg(_acquire, _p, _po, _n)
445#define atomic_try_cmpxchg_release(_p, _po, _n) __atomic_try_cmpxchg(_release, _p, _po, _n)
446
447#else /* atomic_try_cmpxchg */
448#define atomic_try_cmpxchg_relaxed atomic_try_cmpxchg
449#define atomic_try_cmpxchg_acquire atomic_try_cmpxchg
450#define atomic_try_cmpxchg_release atomic_try_cmpxchg
451#endif /* atomic_try_cmpxchg */
452
654672d4
WD		 453/* cmpxchg_relaxed */
454#ifndef cmpxchg_relaxed
455#define cmpxchg_relaxed cmpxchg
456#define cmpxchg_acquire cmpxchg
457#define cmpxchg_release cmpxchg
458
459#else /* cmpxchg_relaxed */
460
461#ifndef cmpxchg_acquire
462#define cmpxchg_acquire(...) \
463 __atomic_op_acquire(cmpxchg, __VA_ARGS__)
464#endif
465
466#ifndef cmpxchg_release
467#define cmpxchg_release(...) \
468 __atomic_op_release(cmpxchg, __VA_ARGS__)
469#endif
470
471#ifndef cmpxchg
472#define cmpxchg(...) \
473 __atomic_op_fence(cmpxchg, __VA_ARGS__)
474#endif
475#endif /* cmpxchg_relaxed */
476
477/* cmpxchg64_relaxed */
478#ifndef cmpxchg64_relaxed
479#define cmpxchg64_relaxed cmpxchg64
480#define cmpxchg64_acquire cmpxchg64
481#define cmpxchg64_release cmpxchg64
482
483#else /* cmpxchg64_relaxed */
484
485#ifndef cmpxchg64_acquire
486#define cmpxchg64_acquire(...) \
487 __atomic_op_acquire(cmpxchg64, __VA_ARGS__)
488#endif
489
490#ifndef cmpxchg64_release
491#define cmpxchg64_release(...) \
492 __atomic_op_release(cmpxchg64, __VA_ARGS__)
493#endif
494
495#ifndef cmpxchg64
496#define cmpxchg64(...) \
497 __atomic_op_fence(cmpxchg64, __VA_ARGS__)
498#endif
499#endif /* cmpxchg64_relaxed */
500
501/* xchg_relaxed */
502#ifndef xchg_relaxed
503#define xchg_relaxed xchg
504#define xchg_acquire xchg
505#define xchg_release xchg
506
507#else /* xchg_relaxed */
508
509#ifndef xchg_acquire
510#define xchg_acquire(...) __atomic_op_acquire(xchg, __VA_ARGS__)
511#endif
512
513#ifndef xchg_release
514#define xchg_release(...) __atomic_op_release(xchg, __VA_ARGS__)
515#endif
516
517#ifndef xchg
518#define xchg(...) __atomic_op_fence(xchg, __VA_ARGS__)
519#endif
520#endif /* xchg_relaxed */
3f9d35b9 521
f24219b4
AS		 522/**
523 * atomic_add_unless - add unless the number is already a given value
524 * @v: pointer of type atomic_t
525 * @a: the amount to add to v...
526 * @u: ...unless v is equal to u.
527 *
528 * Atomically adds @a to @v, so long as @v was not already @u.
529 * Returns non-zero if @v was not @u, and zero otherwise.
530 */
531static inline int atomic_add_unless(atomic_t *v, int a, int u)
532{
533 return __atomic_add_unless(v, a, u) != u;
534}
535
60063497
AS		 536/**
537 * atomic_inc_not_zero - increment unless the number is zero
538 * @v: pointer of type atomic_t
539 *
540 * Atomically increments @v by 1, so long as @v is non-zero.
541 * Returns non-zero if @v was non-zero, and zero otherwise.
542 */
b1ada601 543#ifndef atomic_inc_not_zero
60063497 544#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
b1ada601 545#endif
60063497 546
de9e432c
PZ		 547#ifndef atomic_andnot
548static inline void atomic_andnot(int i, atomic_t *v)
549{
550 atomic_and(~i, v);
551}
28aa2bda
PZ		 552
553static inline int atomic_fetch_andnot(int i, atomic_t *v)
554{
555 return atomic_fetch_and(~i, v);
556}
557
558static inline int atomic_fetch_andnot_relaxed(int i, atomic_t *v)
559{
560 return atomic_fetch_and_relaxed(~i, v);
561}
562
563static inline int atomic_fetch_andnot_acquire(int i, atomic_t *v)
564{
565 return atomic_fetch_and_acquire(~i, v);
566}
567
568static inline int atomic_fetch_andnot_release(int i, atomic_t *v)
569{
570 return atomic_fetch_and_release(~i, v);
571}
de9e432c
PZ		 572#endif
573
3f9d35b9
ED		 574/**
575 * atomic_inc_not_zero_hint - increment if not null
576 * @v: pointer of type atomic_t
577 * @hint: probable value of the atomic before the increment
578 *
579 * This version of atomic_inc_not_zero() gives a hint of probable
580 * value of the atomic. This helps processor to not read the memory
581 * before doing the atomic read/modify/write cycle, lowering
582 * number of bus transactions on some arches.
583 *
584 * Returns: 0 if increment was not done, 1 otherwise.
585 */
586#ifndef atomic_inc_not_zero_hint
587static inline int atomic_inc_not_zero_hint(atomic_t *v, int hint)
588{
589 int val, c = hint;
590
591 /* sanity test, should be removed by compiler if hint is a constant */
592 if (!hint)
593 return atomic_inc_not_zero(v);
594
595 do {
596 val = atomic_cmpxchg(v, c, c + 1);
597 if (val == c)
598 return 1;
599 c = val;
600 } while (c);
601
602 return 0;
603}
604#endif
605
07b8ce1e
AV		 606#ifndef atomic_inc_unless_negative
607static inline int atomic_inc_unless_negative(atomic_t *p)
608{
609 int v, v1;
610 for (v = 0; v >= 0; v = v1) {
611 v1 = atomic_cmpxchg(p, v, v + 1);
612 if (likely(v1 == v))
613 return 1;
614 }
615 return 0;
616}
617#endif
618
619#ifndef atomic_dec_unless_positive
620static inline int atomic_dec_unless_positive(atomic_t *p)
621{
622 int v, v1;
623 for (v = 0; v <= 0; v = v1) {
624 v1 = atomic_cmpxchg(p, v, v - 1);
625 if (likely(v1 == v))
626 return 1;
627 }
628 return 0;
629}
630#endif
631
e79bee24
SL		 632/*
633 * atomic_dec_if_positive - decrement by 1 if old value positive
634 * @v: pointer of type atomic_t
635 *
636 * The function returns the old value of *v minus 1, even if
637 * the atomic variable, v, was not decremented.
638 */
639#ifndef atomic_dec_if_positive
640static inline int atomic_dec_if_positive(atomic_t *v)
641{
642 int c, old, dec;
643 c = atomic_read(v);
644 for (;;) {
645 dec = c - 1;
646 if (unlikely(dec < 0))
647 break;
648 old = atomic_cmpxchg((v), c, dec);
649 if (likely(old == c))
650 break;
651 c = old;
652 }
653 return dec;
654}
655#endif
656
4df714be
WD		 657#define atomic_cond_read_acquire(v, c) smp_cond_load_acquire(&(v)->counter, (c))
658
7847777a
AS		 659#ifdef CONFIG_GENERIC_ATOMIC64
660#include <asm-generic/atomic64.h>
661#endif
de9e432c 662
e1213332
PZ		 663#ifndef atomic64_read_acquire
664#define atomic64_read_acquire(v) smp_load_acquire(&(v)->counter)
665#endif
666
667#ifndef atomic64_set_release
668#define atomic64_set_release(v, i) smp_store_release(&(v)->counter, (i))
669#endif
670
671/* atomic64_add_return_relaxed */
672#ifndef atomic64_add_return_relaxed
673#define atomic64_add_return_relaxed atomic64_add_return
674#define atomic64_add_return_acquire atomic64_add_return
675#define atomic64_add_return_release atomic64_add_return
676
677#else /* atomic64_add_return_relaxed */
678
679#ifndef atomic64_add_return_acquire
680#define atomic64_add_return_acquire(...) \
681 __atomic_op_acquire(atomic64_add_return, __VA_ARGS__)
682#endif
683
684#ifndef atomic64_add_return_release
685#define atomic64_add_return_release(...) \
686 __atomic_op_release(atomic64_add_return, __VA_ARGS__)
687#endif
688
689#ifndef atomic64_add_return
690#define atomic64_add_return(...) \
691 __atomic_op_fence(atomic64_add_return, __VA_ARGS__)
692#endif
693#endif /* atomic64_add_return_relaxed */
694
695/* atomic64_inc_return_relaxed */
696#ifndef atomic64_inc_return_relaxed
697#define atomic64_inc_return_relaxed atomic64_inc_return
698#define atomic64_inc_return_acquire atomic64_inc_return
699#define atomic64_inc_return_release atomic64_inc_return
700
701#else /* atomic64_inc_return_relaxed */
702
703#ifndef atomic64_inc_return_acquire
704#define atomic64_inc_return_acquire(...) \
705 __atomic_op_acquire(atomic64_inc_return, __VA_ARGS__)
706#endif
707
708#ifndef atomic64_inc_return_release
709#define atomic64_inc_return_release(...) \
710 __atomic_op_release(atomic64_inc_return, __VA_ARGS__)
711#endif
712
713#ifndef atomic64_inc_return
714#define atomic64_inc_return(...) \
715 __atomic_op_fence(atomic64_inc_return, __VA_ARGS__)
716#endif
717#endif /* atomic64_inc_return_relaxed */
718
719
720/* atomic64_sub_return_relaxed */
721#ifndef atomic64_sub_return_relaxed
722#define atomic64_sub_return_relaxed atomic64_sub_return
723#define atomic64_sub_return_acquire atomic64_sub_return
724#define atomic64_sub_return_release atomic64_sub_return
725
726#else /* atomic64_sub_return_relaxed */
727
728#ifndef atomic64_sub_return_acquire
729#define atomic64_sub_return_acquire(...) \
730 __atomic_op_acquire(atomic64_sub_return, __VA_ARGS__)
731#endif
732
733#ifndef atomic64_sub_return_release
734#define atomic64_sub_return_release(...) \
735 __atomic_op_release(atomic64_sub_return, __VA_ARGS__)
736#endif
737
738#ifndef atomic64_sub_return
739#define atomic64_sub_return(...) \
740 __atomic_op_fence(atomic64_sub_return, __VA_ARGS__)
741#endif
742#endif /* atomic64_sub_return_relaxed */
743
744/* atomic64_dec_return_relaxed */
745#ifndef atomic64_dec_return_relaxed
746#define atomic64_dec_return_relaxed atomic64_dec_return
747#define atomic64_dec_return_acquire atomic64_dec_return
748#define atomic64_dec_return_release atomic64_dec_return
749
750#else /* atomic64_dec_return_relaxed */
751
752#ifndef atomic64_dec_return_acquire
753#define atomic64_dec_return_acquire(...) \
754 __atomic_op_acquire(atomic64_dec_return, __VA_ARGS__)
755#endif
756
757#ifndef atomic64_dec_return_release
758#define atomic64_dec_return_release(...) \
759 __atomic_op_release(atomic64_dec_return, __VA_ARGS__)
760#endif
761
762#ifndef atomic64_dec_return
763#define atomic64_dec_return(...) \
764 __atomic_op_fence(atomic64_dec_return, __VA_ARGS__)
765#endif
766#endif /* atomic64_dec_return_relaxed */
767
28aa2bda
PZ		 768
769/* atomic64_fetch_add_relaxed */
770#ifndef atomic64_fetch_add_relaxed
771#define atomic64_fetch_add_relaxed atomic64_fetch_add
772#define atomic64_fetch_add_acquire atomic64_fetch_add
773#define atomic64_fetch_add_release atomic64_fetch_add
774
775#else /* atomic64_fetch_add_relaxed */
776
777#ifndef atomic64_fetch_add_acquire
778#define atomic64_fetch_add_acquire(...) \
779 __atomic_op_acquire(atomic64_fetch_add, __VA_ARGS__)
780#endif
781
782#ifndef atomic64_fetch_add_release
783#define atomic64_fetch_add_release(...) \
784 __atomic_op_release(atomic64_fetch_add, __VA_ARGS__)
785#endif
786
787#ifndef atomic64_fetch_add
788#define atomic64_fetch_add(...) \
789 __atomic_op_fence(atomic64_fetch_add, __VA_ARGS__)
790#endif
791#endif /* atomic64_fetch_add_relaxed */
792
f0662863
DB		 793/* atomic64_fetch_inc_relaxed */
794#ifndef atomic64_fetch_inc_relaxed
795
796#ifndef atomic64_fetch_inc
797#define atomic64_fetch_inc(v) atomic64_fetch_add(1, (v))
798#define atomic64_fetch_inc_relaxed(v) atomic64_fetch_add_relaxed(1, (v))
799#define atomic64_fetch_inc_acquire(v) atomic64_fetch_add_acquire(1, (v))
800#define atomic64_fetch_inc_release(v) atomic64_fetch_add_release(1, (v))
801#else /* atomic64_fetch_inc */
802#define atomic64_fetch_inc_relaxed atomic64_fetch_inc
803#define atomic64_fetch_inc_acquire atomic64_fetch_inc
804#define atomic64_fetch_inc_release atomic64_fetch_inc
805#endif /* atomic64_fetch_inc */
806
807#else /* atomic64_fetch_inc_relaxed */
808
809#ifndef atomic64_fetch_inc_acquire
810#define atomic64_fetch_inc_acquire(...) \
811 __atomic_op_acquire(atomic64_fetch_inc, __VA_ARGS__)
812#endif
813
814#ifndef atomic64_fetch_inc_release
815#define atomic64_fetch_inc_release(...) \
816 __atomic_op_release(atomic64_fetch_inc, __VA_ARGS__)
817#endif
818
819#ifndef atomic64_fetch_inc
820#define atomic64_fetch_inc(...) \
821 __atomic_op_fence(atomic64_fetch_inc, __VA_ARGS__)
822#endif
823#endif /* atomic64_fetch_inc_relaxed */
824
28aa2bda
PZ		 825/* atomic64_fetch_sub_relaxed */
826#ifndef atomic64_fetch_sub_relaxed
827#define atomic64_fetch_sub_relaxed atomic64_fetch_sub
828#define atomic64_fetch_sub_acquire atomic64_fetch_sub
829#define atomic64_fetch_sub_release atomic64_fetch_sub
830
831#else /* atomic64_fetch_sub_relaxed */
832
833#ifndef atomic64_fetch_sub_acquire
834#define atomic64_fetch_sub_acquire(...) \
835 __atomic_op_acquire(atomic64_fetch_sub, __VA_ARGS__)
836#endif
837
838#ifndef atomic64_fetch_sub_release
839#define atomic64_fetch_sub_release(...) \
840 __atomic_op_release(atomic64_fetch_sub, __VA_ARGS__)
841#endif
842
843#ifndef atomic64_fetch_sub
844#define atomic64_fetch_sub(...) \
845 __atomic_op_fence(atomic64_fetch_sub, __VA_ARGS__)
846#endif
847#endif /* atomic64_fetch_sub_relaxed */
848
f0662863
DB		 849/* atomic64_fetch_dec_relaxed */
850#ifndef atomic64_fetch_dec_relaxed
851
852#ifndef atomic64_fetch_dec
853#define atomic64_fetch_dec(v) atomic64_fetch_sub(1, (v))
854#define atomic64_fetch_dec_relaxed(v) atomic64_fetch_sub_relaxed(1, (v))
855#define atomic64_fetch_dec_acquire(v) atomic64_fetch_sub_acquire(1, (v))
856#define atomic64_fetch_dec_release(v) atomic64_fetch_sub_release(1, (v))
857#else /* atomic64_fetch_dec */
858#define atomic64_fetch_dec_relaxed atomic64_fetch_dec
859#define atomic64_fetch_dec_acquire atomic64_fetch_dec
860#define atomic64_fetch_dec_release atomic64_fetch_dec
861#endif /* atomic64_fetch_dec */
862
863#else /* atomic64_fetch_dec_relaxed */
864
865#ifndef atomic64_fetch_dec_acquire
866#define atomic64_fetch_dec_acquire(...) \
867 __atomic_op_acquire(atomic64_fetch_dec, __VA_ARGS__)
868#endif
869
870#ifndef atomic64_fetch_dec_release
871#define atomic64_fetch_dec_release(...) \
872 __atomic_op_release(atomic64_fetch_dec, __VA_ARGS__)
873#endif
874
875#ifndef atomic64_fetch_dec
876#define atomic64_fetch_dec(...) \
877 __atomic_op_fence(atomic64_fetch_dec, __VA_ARGS__)
878#endif
879#endif /* atomic64_fetch_dec_relaxed */
880
28aa2bda
PZ		 881/* atomic64_fetch_or_relaxed */
882#ifndef atomic64_fetch_or_relaxed
883#define atomic64_fetch_or_relaxed atomic64_fetch_or
884#define atomic64_fetch_or_acquire atomic64_fetch_or
885#define atomic64_fetch_or_release atomic64_fetch_or
886
887#else /* atomic64_fetch_or_relaxed */
888
889#ifndef atomic64_fetch_or_acquire
890#define atomic64_fetch_or_acquire(...) \
891 __atomic_op_acquire(atomic64_fetch_or, __VA_ARGS__)
892#endif
893
894#ifndef atomic64_fetch_or_release
895#define atomic64_fetch_or_release(...) \
896 __atomic_op_release(atomic64_fetch_or, __VA_ARGS__)
897#endif
898
899#ifndef atomic64_fetch_or
900#define atomic64_fetch_or(...) \
901 __atomic_op_fence(atomic64_fetch_or, __VA_ARGS__)
902#endif
903#endif /* atomic64_fetch_or_relaxed */
904
905/* atomic64_fetch_and_relaxed */
906#ifndef atomic64_fetch_and_relaxed
907#define atomic64_fetch_and_relaxed atomic64_fetch_and
908#define atomic64_fetch_and_acquire atomic64_fetch_and
909#define atomic64_fetch_and_release atomic64_fetch_and
910
911#else /* atomic64_fetch_and_relaxed */
912
913#ifndef atomic64_fetch_and_acquire
914#define atomic64_fetch_and_acquire(...) \
915 __atomic_op_acquire(atomic64_fetch_and, __VA_ARGS__)
916#endif
917
918#ifndef atomic64_fetch_and_release
919#define atomic64_fetch_and_release(...) \
920 __atomic_op_release(atomic64_fetch_and, __VA_ARGS__)
921#endif
922
923#ifndef atomic64_fetch_and
924#define atomic64_fetch_and(...) \
925 __atomic_op_fence(atomic64_fetch_and, __VA_ARGS__)
926#endif
927#endif /* atomic64_fetch_and_relaxed */
928
929#ifdef atomic64_andnot
930/* atomic64_fetch_andnot_relaxed */
931#ifndef atomic64_fetch_andnot_relaxed
932#define atomic64_fetch_andnot_relaxed atomic64_fetch_andnot
933#define atomic64_fetch_andnot_acquire atomic64_fetch_andnot
934#define atomic64_fetch_andnot_release atomic64_fetch_andnot
935
936#else /* atomic64_fetch_andnot_relaxed */
937
938#ifndef atomic64_fetch_andnot_acquire
939#define atomic64_fetch_andnot_acquire(...) \
940 __atomic_op_acquire(atomic64_fetch_andnot, __VA_ARGS__)
941#endif
942
943#ifndef atomic64_fetch_andnot_release
944#define atomic64_fetch_andnot_release(...) \
945 __atomic_op_release(atomic64_fetch_andnot, __VA_ARGS__)
946#endif
947
948#ifndef atomic64_fetch_andnot
949#define atomic64_fetch_andnot(...) \
950 __atomic_op_fence(atomic64_fetch_andnot, __VA_ARGS__)
951#endif
952#endif /* atomic64_fetch_andnot_relaxed */
953#endif /* atomic64_andnot */
954
955/* atomic64_fetch_xor_relaxed */
956#ifndef atomic64_fetch_xor_relaxed
957#define atomic64_fetch_xor_relaxed atomic64_fetch_xor
958#define atomic64_fetch_xor_acquire atomic64_fetch_xor
959#define atomic64_fetch_xor_release atomic64_fetch_xor
960
961#else /* atomic64_fetch_xor_relaxed */
962
963#ifndef atomic64_fetch_xor_acquire
964#define atomic64_fetch_xor_acquire(...) \
965 __atomic_op_acquire(atomic64_fetch_xor, __VA_ARGS__)
966#endif
967
968#ifndef atomic64_fetch_xor_release
969#define atomic64_fetch_xor_release(...) \
970 __atomic_op_release(atomic64_fetch_xor, __VA_ARGS__)
971#endif
972
973#ifndef atomic64_fetch_xor
974#define atomic64_fetch_xor(...) \
975 __atomic_op_fence(atomic64_fetch_xor, __VA_ARGS__)
976#endif
977#endif /* atomic64_fetch_xor_relaxed */
978
979
e1213332
PZ		 980/* atomic64_xchg_relaxed */
981#ifndef atomic64_xchg_relaxed
982#define atomic64_xchg_relaxed atomic64_xchg
983#define atomic64_xchg_acquire atomic64_xchg
984#define atomic64_xchg_release atomic64_xchg
985
986#else /* atomic64_xchg_relaxed */
987
988#ifndef atomic64_xchg_acquire
989#define atomic64_xchg_acquire(...) \
990 __atomic_op_acquire(atomic64_xchg, __VA_ARGS__)
991#endif
992
993#ifndef atomic64_xchg_release
994#define atomic64_xchg_release(...) \
995 __atomic_op_release(atomic64_xchg, __VA_ARGS__)
996#endif
997
998#ifndef atomic64_xchg
999#define atomic64_xchg(...) \
1000 __atomic_op_fence(atomic64_xchg, __VA_ARGS__)
1001#endif
1002#endif /* atomic64_xchg_relaxed */
1003
1004/* atomic64_cmpxchg_relaxed */
1005#ifndef atomic64_cmpxchg_relaxed
1006#define atomic64_cmpxchg_relaxed atomic64_cmpxchg
1007#define atomic64_cmpxchg_acquire atomic64_cmpxchg
1008#define atomic64_cmpxchg_release atomic64_cmpxchg
1009
1010#else /* atomic64_cmpxchg_relaxed */
1011
1012#ifndef atomic64_cmpxchg_acquire
1013#define atomic64_cmpxchg_acquire(...) \
1014 __atomic_op_acquire(atomic64_cmpxchg, __VA_ARGS__)
1015#endif
1016
1017#ifndef atomic64_cmpxchg_release
1018#define atomic64_cmpxchg_release(...) \
1019 __atomic_op_release(atomic64_cmpxchg, __VA_ARGS__)
1020#endif
1021
1022#ifndef atomic64_cmpxchg
1023#define atomic64_cmpxchg(...) \
1024 __atomic_op_fence(atomic64_cmpxchg, __VA_ARGS__)
1025#endif
1026#endif /* atomic64_cmpxchg_relaxed */
1027
a9ebf306
PZ		 1028#ifndef atomic64_try_cmpxchg
1029
1030#define __atomic64_try_cmpxchg(type, _p, _po, _n) \
1031({ \
1032 typeof(_po) __po = (_po); \
44fe8445
PZ		 1033 typeof(*(_po)) __r, __o = *__po; \
1034 __r = atomic64_cmpxchg##type((_p), __o, (_n)); \
1035 if (unlikely(__r != __o)) \
1036 *__po = __r; \
1037 likely(__r == __o); \
a9ebf306
PZ		 1038})
1039
1040#define atomic64_try_cmpxchg(_p, _po, _n) __atomic64_try_cmpxchg(, _p, _po, _n)
1041#define atomic64_try_cmpxchg_relaxed(_p, _po, _n) __atomic64_try_cmpxchg(_relaxed, _p, _po, _n)
1042#define atomic64_try_cmpxchg_acquire(_p, _po, _n) __atomic64_try_cmpxchg(_acquire, _p, _po, _n)
1043#define atomic64_try_cmpxchg_release(_p, _po, _n) __atomic64_try_cmpxchg(_release, _p, _po, _n)
1044
1045#else /* atomic64_try_cmpxchg */
1046#define atomic64_try_cmpxchg_relaxed atomic64_try_cmpxchg
1047#define atomic64_try_cmpxchg_acquire atomic64_try_cmpxchg
1048#define atomic64_try_cmpxchg_release atomic64_try_cmpxchg
1049#endif /* atomic64_try_cmpxchg */
1050
de9e432c
PZ		 1051#ifndef atomic64_andnot
1052static inline void atomic64_andnot(long long i, atomic64_t *v)
1053{
1054 atomic64_and(~i, v);
1055}
28aa2bda
PZ		 1056
1057static inline long long atomic64_fetch_andnot(long long i, atomic64_t *v)
1058{
1059 return atomic64_fetch_and(~i, v);
1060}
1061
1062static inline long long atomic64_fetch_andnot_relaxed(long long i, atomic64_t *v)
1063{
1064 return atomic64_fetch_and_relaxed(~i, v);
1065}
1066
1067static inline long long atomic64_fetch_andnot_acquire(long long i, atomic64_t *v)
1068{
1069 return atomic64_fetch_and_acquire(~i, v);
1070}
1071
1072static inline long long atomic64_fetch_andnot_release(long long i, atomic64_t *v)
1073{
1074 return atomic64_fetch_and_release(~i, v);
1075}
de9e432c
PZ		 1076#endif
1077
4df714be
WD		 1078#define atomic64_cond_read_acquire(v, c) smp_cond_load_acquire(&(v)->counter, (c))
1079
90fe6514
PZ		 1080#include <asm-generic/atomic-long.h>
1081
3f9d35b9 1082#endif /* _LINUX_ATOMIC_H */
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