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