Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0 */
2 : #ifndef __LINUX_FIND_H_
3 : #define __LINUX_FIND_H_
4 :
5 : #ifndef __LINUX_BITMAP_H
6 : #error only <linux/bitmap.h> can be included directly
7 : #endif
8 :
9 : #include <linux/bitops.h>
10 :
11 : unsigned long _find_next_bit(const unsigned long *addr1, unsigned long nbits,
12 : unsigned long start);
13 : unsigned long _find_next_and_bit(const unsigned long *addr1, const unsigned long *addr2,
14 : unsigned long nbits, unsigned long start);
15 : unsigned long _find_next_andnot_bit(const unsigned long *addr1, const unsigned long *addr2,
16 : unsigned long nbits, unsigned long start);
17 : unsigned long _find_next_or_bit(const unsigned long *addr1, const unsigned long *addr2,
18 : unsigned long nbits, unsigned long start);
19 : unsigned long _find_next_zero_bit(const unsigned long *addr, unsigned long nbits,
20 : unsigned long start);
21 : extern unsigned long _find_first_bit(const unsigned long *addr, unsigned long size);
22 : unsigned long __find_nth_bit(const unsigned long *addr, unsigned long size, unsigned long n);
23 : unsigned long __find_nth_and_bit(const unsigned long *addr1, const unsigned long *addr2,
24 : unsigned long size, unsigned long n);
25 : unsigned long __find_nth_andnot_bit(const unsigned long *addr1, const unsigned long *addr2,
26 : unsigned long size, unsigned long n);
27 : unsigned long __find_nth_and_andnot_bit(const unsigned long *addr1, const unsigned long *addr2,
28 : const unsigned long *addr3, unsigned long size,
29 : unsigned long n);
30 : extern unsigned long _find_first_and_bit(const unsigned long *addr1,
31 : const unsigned long *addr2, unsigned long size);
32 : extern unsigned long _find_first_zero_bit(const unsigned long *addr, unsigned long size);
33 : extern unsigned long _find_last_bit(const unsigned long *addr, unsigned long size);
34 :
35 : #ifdef __BIG_ENDIAN
36 : unsigned long _find_first_zero_bit_le(const unsigned long *addr, unsigned long size);
37 : unsigned long _find_next_zero_bit_le(const unsigned long *addr, unsigned
38 : long size, unsigned long offset);
39 : unsigned long _find_next_bit_le(const unsigned long *addr, unsigned
40 : long size, unsigned long offset);
41 : #endif
42 :
43 : #ifndef find_next_bit
44 : /**
45 : * find_next_bit - find the next set bit in a memory region
46 : * @addr: The address to base the search on
47 : * @size: The bitmap size in bits
48 : * @offset: The bitnumber to start searching at
49 : *
50 : * Returns the bit number for the next set bit
51 : * If no bits are set, returns @size.
52 : */
53 : static inline
54 17486 : unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
55 : unsigned long offset)
56 : {
57 17486 : if (small_const_nbits(size)) {
58 : unsigned long val;
59 :
60 0 : if (unlikely(offset >= size))
61 : return size;
62 :
63 0 : val = *addr & GENMASK(size - 1, offset);
64 0 : return val ? __ffs(val) : size;
65 : }
66 :
67 17486 : return _find_next_bit(addr, size, offset);
68 : }
69 : #endif
70 :
71 : #ifndef find_next_and_bit
72 : /**
73 : * find_next_and_bit - find the next set bit in both memory regions
74 : * @addr1: The first address to base the search on
75 : * @addr2: The second address to base the search on
76 : * @size: The bitmap size in bits
77 : * @offset: The bitnumber to start searching at
78 : *
79 : * Returns the bit number for the next set bit
80 : * If no bits are set, returns @size.
81 : */
82 : static inline
83 0 : unsigned long find_next_and_bit(const unsigned long *addr1,
84 : const unsigned long *addr2, unsigned long size,
85 : unsigned long offset)
86 : {
87 0 : if (small_const_nbits(size)) {
88 : unsigned long val;
89 :
90 0 : if (unlikely(offset >= size))
91 : return size;
92 :
93 0 : val = *addr1 & *addr2 & GENMASK(size - 1, offset);
94 0 : return val ? __ffs(val) : size;
95 : }
96 :
97 0 : return _find_next_and_bit(addr1, addr2, size, offset);
98 : }
99 : #endif
100 :
101 : #ifndef find_next_andnot_bit
102 : /**
103 : * find_next_andnot_bit - find the next set bit in *addr1 excluding all the bits
104 : * in *addr2
105 : * @addr1: The first address to base the search on
106 : * @addr2: The second address to base the search on
107 : * @size: The bitmap size in bits
108 : * @offset: The bitnumber to start searching at
109 : *
110 : * Returns the bit number for the next set bit
111 : * If no bits are set, returns @size.
112 : */
113 : static inline
114 : unsigned long find_next_andnot_bit(const unsigned long *addr1,
115 : const unsigned long *addr2, unsigned long size,
116 : unsigned long offset)
117 : {
118 : if (small_const_nbits(size)) {
119 : unsigned long val;
120 :
121 : if (unlikely(offset >= size))
122 : return size;
123 :
124 : val = *addr1 & ~*addr2 & GENMASK(size - 1, offset);
125 : return val ? __ffs(val) : size;
126 : }
127 :
128 : return _find_next_andnot_bit(addr1, addr2, size, offset);
129 : }
130 : #endif
131 :
132 : #ifndef find_next_or_bit
133 : /**
134 : * find_next_or_bit - find the next set bit in either memory regions
135 : * @addr1: The first address to base the search on
136 : * @addr2: The second address to base the search on
137 : * @size: The bitmap size in bits
138 : * @offset: The bitnumber to start searching at
139 : *
140 : * Returns the bit number for the next set bit
141 : * If no bits are set, returns @size.
142 : */
143 : static inline
144 : unsigned long find_next_or_bit(const unsigned long *addr1,
145 : const unsigned long *addr2, unsigned long size,
146 : unsigned long offset)
147 : {
148 : if (small_const_nbits(size)) {
149 : unsigned long val;
150 :
151 : if (unlikely(offset >= size))
152 : return size;
153 :
154 : val = (*addr1 | *addr2) & GENMASK(size - 1, offset);
155 : return val ? __ffs(val) : size;
156 : }
157 :
158 : return _find_next_or_bit(addr1, addr2, size, offset);
159 : }
160 : #endif
161 :
162 : #ifndef find_next_zero_bit
163 : /**
164 : * find_next_zero_bit - find the next cleared bit in a memory region
165 : * @addr: The address to base the search on
166 : * @size: The bitmap size in bits
167 : * @offset: The bitnumber to start searching at
168 : *
169 : * Returns the bit number of the next zero bit
170 : * If no bits are zero, returns @size.
171 : */
172 : static inline
173 1608 : unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size,
174 : unsigned long offset)
175 : {
176 1608 : if (small_const_nbits(size)) {
177 : unsigned long val;
178 :
179 127 : if (unlikely(offset >= size))
180 : return size;
181 :
182 127 : val = *addr | ~GENMASK(size - 1, offset);
183 253 : return val == ~0UL ? size : ffz(val);
184 : }
185 :
186 1481 : return _find_next_zero_bit(addr, size, offset);
187 : }
188 : #endif
189 :
190 : #ifndef find_first_bit
191 : /**
192 : * find_first_bit - find the first set bit in a memory region
193 : * @addr: The address to start the search at
194 : * @size: The maximum number of bits to search
195 : *
196 : * Returns the bit number of the first set bit.
197 : * If no bits are set, returns @size.
198 : */
199 : static inline
200 12047 : unsigned long find_first_bit(const unsigned long *addr, unsigned long size)
201 : {
202 12047 : if (small_const_nbits(size)) {
203 0 : unsigned long val = *addr & GENMASK(size - 1, 0);
204 :
205 0 : return val ? __ffs(val) : size;
206 : }
207 :
208 12047 : return _find_first_bit(addr, size);
209 : }
210 : #endif
211 :
212 : /**
213 : * find_nth_bit - find N'th set bit in a memory region
214 : * @addr: The address to start the search at
215 : * @size: The maximum number of bits to search
216 : * @n: The number of set bit, which position is needed, counting from 0
217 : *
218 : * The following is semantically equivalent:
219 : * idx = find_nth_bit(addr, size, 0);
220 : * idx = find_first_bit(addr, size);
221 : *
222 : * Returns the bit number of the N'th set bit.
223 : * If no such, returns @size.
224 : */
225 : static inline
226 0 : unsigned long find_nth_bit(const unsigned long *addr, unsigned long size, unsigned long n)
227 : {
228 0 : if (n >= size)
229 : return size;
230 :
231 0 : if (small_const_nbits(size)) {
232 0 : unsigned long val = *addr & GENMASK(size - 1, 0);
233 :
234 0 : return val ? fns(val, n) : size;
235 : }
236 :
237 0 : return __find_nth_bit(addr, size, n);
238 : }
239 :
240 : /**
241 : * find_nth_and_bit - find N'th set bit in 2 memory regions
242 : * @addr1: The 1st address to start the search at
243 : * @addr2: The 2nd address to start the search at
244 : * @size: The maximum number of bits to search
245 : * @n: The number of set bit, which position is needed, counting from 0
246 : *
247 : * Returns the bit number of the N'th set bit.
248 : * If no such, returns @size.
249 : */
250 : static inline
251 : unsigned long find_nth_and_bit(const unsigned long *addr1, const unsigned long *addr2,
252 : unsigned long size, unsigned long n)
253 : {
254 : if (n >= size)
255 : return size;
256 :
257 : if (small_const_nbits(size)) {
258 : unsigned long val = *addr1 & *addr2 & GENMASK(size - 1, 0);
259 :
260 : return val ? fns(val, n) : size;
261 : }
262 :
263 : return __find_nth_and_bit(addr1, addr2, size, n);
264 : }
265 :
266 : /**
267 : * find_nth_andnot_bit - find N'th set bit in 2 memory regions,
268 : * flipping bits in 2nd region
269 : * @addr1: The 1st address to start the search at
270 : * @addr2: The 2nd address to start the search at
271 : * @size: The maximum number of bits to search
272 : * @n: The number of set bit, which position is needed, counting from 0
273 : *
274 : * Returns the bit number of the N'th set bit.
275 : * If no such, returns @size.
276 : */
277 : static inline
278 : unsigned long find_nth_andnot_bit(const unsigned long *addr1, const unsigned long *addr2,
279 : unsigned long size, unsigned long n)
280 : {
281 : if (n >= size)
282 : return size;
283 :
284 : if (small_const_nbits(size)) {
285 : unsigned long val = *addr1 & (~*addr2) & GENMASK(size - 1, 0);
286 :
287 : return val ? fns(val, n) : size;
288 : }
289 :
290 : return __find_nth_andnot_bit(addr1, addr2, size, n);
291 : }
292 :
293 : /**
294 : * find_nth_and_andnot_bit - find N'th set bit in 2 memory regions,
295 : * excluding those set in 3rd region
296 : * @addr1: The 1st address to start the search at
297 : * @addr2: The 2nd address to start the search at
298 : * @addr3: The 3rd address to start the search at
299 : * @size: The maximum number of bits to search
300 : * @n: The number of set bit, which position is needed, counting from 0
301 : *
302 : * Returns the bit number of the N'th set bit.
303 : * If no such, returns @size.
304 : */
305 : static __always_inline
306 : unsigned long find_nth_and_andnot_bit(const unsigned long *addr1,
307 : const unsigned long *addr2,
308 : const unsigned long *addr3,
309 : unsigned long size, unsigned long n)
310 : {
311 : if (n >= size)
312 : return size;
313 :
314 : if (small_const_nbits(size)) {
315 : unsigned long val = *addr1 & *addr2 & (~*addr3) & GENMASK(size - 1, 0);
316 :
317 : return val ? fns(val, n) : size;
318 : }
319 :
320 : return __find_nth_and_andnot_bit(addr1, addr2, addr3, size, n);
321 : }
322 :
323 : #ifndef find_first_and_bit
324 : /**
325 : * find_first_and_bit - find the first set bit in both memory regions
326 : * @addr1: The first address to base the search on
327 : * @addr2: The second address to base the search on
328 : * @size: The bitmap size in bits
329 : *
330 : * Returns the bit number for the next set bit
331 : * If no bits are set, returns @size.
332 : */
333 : static inline
334 0 : unsigned long find_first_and_bit(const unsigned long *addr1,
335 : const unsigned long *addr2,
336 : unsigned long size)
337 : {
338 0 : if (small_const_nbits(size)) {
339 0 : unsigned long val = *addr1 & *addr2 & GENMASK(size - 1, 0);
340 :
341 0 : return val ? __ffs(val) : size;
342 : }
343 :
344 0 : return _find_first_and_bit(addr1, addr2, size);
345 : }
346 : #endif
347 :
348 : #ifndef find_first_zero_bit
349 : /**
350 : * find_first_zero_bit - find the first cleared bit in a memory region
351 : * @addr: The address to start the search at
352 : * @size: The maximum number of bits to search
353 : *
354 : * Returns the bit number of the first cleared bit.
355 : * If no bits are zero, returns @size.
356 : */
357 : static inline
358 119 : unsigned long find_first_zero_bit(const unsigned long *addr, unsigned long size)
359 : {
360 119 : if (small_const_nbits(size)) {
361 0 : unsigned long val = *addr | ~GENMASK(size - 1, 0);
362 :
363 0 : return val == ~0UL ? size : ffz(val);
364 : }
365 :
366 119 : return _find_first_zero_bit(addr, size);
367 : }
368 : #endif
369 :
370 : #ifndef find_last_bit
371 : /**
372 : * find_last_bit - find the last set bit in a memory region
373 : * @addr: The address to start the search at
374 : * @size: The number of bits to search
375 : *
376 : * Returns the bit number of the last set bit, or size.
377 : */
378 : static inline
379 12092 : unsigned long find_last_bit(const unsigned long *addr, unsigned long size)
380 : {
381 12092 : if (small_const_nbits(size)) {
382 0 : unsigned long val = *addr & GENMASK(size - 1, 0);
383 :
384 0 : return val ? __fls(val) : size;
385 : }
386 :
387 12092 : return _find_last_bit(addr, size);
388 : }
389 : #endif
390 :
391 : /**
392 : * find_next_and_bit_wrap - find the next set bit in both memory regions
393 : * @addr1: The first address to base the search on
394 : * @addr2: The second address to base the search on
395 : * @size: The bitmap size in bits
396 : * @offset: The bitnumber to start searching at
397 : *
398 : * Returns the bit number for the next set bit, or first set bit up to @offset
399 : * If no bits are set, returns @size.
400 : */
401 : static inline
402 : unsigned long find_next_and_bit_wrap(const unsigned long *addr1,
403 : const unsigned long *addr2,
404 : unsigned long size, unsigned long offset)
405 : {
406 : unsigned long bit = find_next_and_bit(addr1, addr2, size, offset);
407 :
408 : if (bit < size)
409 : return bit;
410 :
411 : bit = find_first_and_bit(addr1, addr2, offset);
412 : return bit < offset ? bit : size;
413 : }
414 :
415 : /**
416 : * find_next_bit_wrap - find the next set bit in both memory regions
417 : * @addr: The first address to base the search on
418 : * @size: The bitmap size in bits
419 : * @offset: The bitnumber to start searching at
420 : *
421 : * Returns the bit number for the next set bit, or first set bit up to @offset
422 : * If no bits are set, returns @size.
423 : */
424 : static inline
425 : unsigned long find_next_bit_wrap(const unsigned long *addr,
426 : unsigned long size, unsigned long offset)
427 : {
428 : unsigned long bit = find_next_bit(addr, size, offset);
429 :
430 : if (bit < size)
431 : return bit;
432 :
433 : bit = find_first_bit(addr, offset);
434 : return bit < offset ? bit : size;
435 : }
436 :
437 : /*
438 : * Helper for for_each_set_bit_wrap(). Make sure you're doing right thing
439 : * before using it alone.
440 : */
441 : static inline
442 : unsigned long __for_each_wrap(const unsigned long *bitmap, unsigned long size,
443 : unsigned long start, unsigned long n)
444 : {
445 : unsigned long bit;
446 :
447 : /* If not wrapped around */
448 : if (n > start) {
449 : /* and have a bit, just return it. */
450 : bit = find_next_bit(bitmap, size, n);
451 : if (bit < size)
452 : return bit;
453 :
454 : /* Otherwise, wrap around and ... */
455 : n = 0;
456 : }
457 :
458 : /* Search the other part. */
459 : bit = find_next_bit(bitmap, start, n);
460 : return bit < start ? bit : size;
461 : }
462 :
463 : /**
464 : * find_next_clump8 - find next 8-bit clump with set bits in a memory region
465 : * @clump: location to store copy of found clump
466 : * @addr: address to base the search on
467 : * @size: bitmap size in number of bits
468 : * @offset: bit offset at which to start searching
469 : *
470 : * Returns the bit offset for the next set clump; the found clump value is
471 : * copied to the location pointed by @clump. If no bits are set, returns @size.
472 : */
473 : extern unsigned long find_next_clump8(unsigned long *clump,
474 : const unsigned long *addr,
475 : unsigned long size, unsigned long offset);
476 :
477 : #define find_first_clump8(clump, bits, size) \
478 : find_next_clump8((clump), (bits), (size), 0)
479 :
480 : #if defined(__LITTLE_ENDIAN)
481 :
482 : static inline unsigned long find_next_zero_bit_le(const void *addr,
483 : unsigned long size, unsigned long offset)
484 : {
485 : return find_next_zero_bit(addr, size, offset);
486 : }
487 :
488 : static inline unsigned long find_next_bit_le(const void *addr,
489 : unsigned long size, unsigned long offset)
490 : {
491 : return find_next_bit(addr, size, offset);
492 : }
493 :
494 : static inline unsigned long find_first_zero_bit_le(const void *addr,
495 : unsigned long size)
496 : {
497 : return find_first_zero_bit(addr, size);
498 : }
499 :
500 : #elif defined(__BIG_ENDIAN)
501 :
502 : #ifndef find_next_zero_bit_le
503 : static inline
504 : unsigned long find_next_zero_bit_le(const void *addr, unsigned
505 : long size, unsigned long offset)
506 : {
507 : if (small_const_nbits(size)) {
508 : unsigned long val = *(const unsigned long *)addr;
509 :
510 : if (unlikely(offset >= size))
511 : return size;
512 :
513 : val = swab(val) | ~GENMASK(size - 1, offset);
514 : return val == ~0UL ? size : ffz(val);
515 : }
516 :
517 : return _find_next_zero_bit_le(addr, size, offset);
518 : }
519 : #endif
520 :
521 : #ifndef find_first_zero_bit_le
522 : static inline
523 : unsigned long find_first_zero_bit_le(const void *addr, unsigned long size)
524 : {
525 : if (small_const_nbits(size)) {
526 : unsigned long val = swab(*(const unsigned long *)addr) | ~GENMASK(size - 1, 0);
527 :
528 : return val == ~0UL ? size : ffz(val);
529 : }
530 :
531 : return _find_first_zero_bit_le(addr, size);
532 : }
533 : #endif
534 :
535 : #ifndef find_next_bit_le
536 : static inline
537 : unsigned long find_next_bit_le(const void *addr, unsigned
538 : long size, unsigned long offset)
539 : {
540 : if (small_const_nbits(size)) {
541 : unsigned long val = *(const unsigned long *)addr;
542 :
543 : if (unlikely(offset >= size))
544 : return size;
545 :
546 : val = swab(val) & GENMASK(size - 1, offset);
547 : return val ? __ffs(val) : size;
548 : }
549 :
550 : return _find_next_bit_le(addr, size, offset);
551 : }
552 : #endif
553 :
554 : #else
555 : #error "Please fix <asm/byteorder.h>"
556 : #endif
557 :
558 : #define for_each_set_bit(bit, addr, size) \
559 : for ((bit) = 0; (bit) = find_next_bit((addr), (size), (bit)), (bit) < (size); (bit)++)
560 :
561 : #define for_each_and_bit(bit, addr1, addr2, size) \
562 : for ((bit) = 0; \
563 : (bit) = find_next_and_bit((addr1), (addr2), (size), (bit)), (bit) < (size);\
564 : (bit)++)
565 :
566 : #define for_each_andnot_bit(bit, addr1, addr2, size) \
567 : for ((bit) = 0; \
568 : (bit) = find_next_andnot_bit((addr1), (addr2), (size), (bit)), (bit) < (size);\
569 : (bit)++)
570 :
571 : #define for_each_or_bit(bit, addr1, addr2, size) \
572 : for ((bit) = 0; \
573 : (bit) = find_next_or_bit((addr1), (addr2), (size), (bit)), (bit) < (size);\
574 : (bit)++)
575 :
576 : /* same as for_each_set_bit() but use bit as value to start with */
577 : #define for_each_set_bit_from(bit, addr, size) \
578 : for (; (bit) = find_next_bit((addr), (size), (bit)), (bit) < (size); (bit)++)
579 :
580 : #define for_each_clear_bit(bit, addr, size) \
581 : for ((bit) = 0; \
582 : (bit) = find_next_zero_bit((addr), (size), (bit)), (bit) < (size); \
583 : (bit)++)
584 :
585 : /* same as for_each_clear_bit() but use bit as value to start with */
586 : #define for_each_clear_bit_from(bit, addr, size) \
587 : for (; (bit) = find_next_zero_bit((addr), (size), (bit)), (bit) < (size); (bit)++)
588 :
589 : /**
590 : * for_each_set_bitrange - iterate over all set bit ranges [b; e)
591 : * @b: bit offset of start of current bitrange (first set bit)
592 : * @e: bit offset of end of current bitrange (first unset bit)
593 : * @addr: bitmap address to base the search on
594 : * @size: bitmap size in number of bits
595 : */
596 : #define for_each_set_bitrange(b, e, addr, size) \
597 : for ((b) = 0; \
598 : (b) = find_next_bit((addr), (size), b), \
599 : (e) = find_next_zero_bit((addr), (size), (b) + 1), \
600 : (b) < (size); \
601 : (b) = (e) + 1)
602 :
603 : /**
604 : * for_each_set_bitrange_from - iterate over all set bit ranges [b; e)
605 : * @b: bit offset of start of current bitrange (first set bit); must be initialized
606 : * @e: bit offset of end of current bitrange (first unset bit)
607 : * @addr: bitmap address to base the search on
608 : * @size: bitmap size in number of bits
609 : */
610 : #define for_each_set_bitrange_from(b, e, addr, size) \
611 : for (; \
612 : (b) = find_next_bit((addr), (size), (b)), \
613 : (e) = find_next_zero_bit((addr), (size), (b) + 1), \
614 : (b) < (size); \
615 : (b) = (e) + 1)
616 :
617 : /**
618 : * for_each_clear_bitrange - iterate over all unset bit ranges [b; e)
619 : * @b: bit offset of start of current bitrange (first unset bit)
620 : * @e: bit offset of end of current bitrange (first set bit)
621 : * @addr: bitmap address to base the search on
622 : * @size: bitmap size in number of bits
623 : */
624 : #define for_each_clear_bitrange(b, e, addr, size) \
625 : for ((b) = 0; \
626 : (b) = find_next_zero_bit((addr), (size), (b)), \
627 : (e) = find_next_bit((addr), (size), (b) + 1), \
628 : (b) < (size); \
629 : (b) = (e) + 1)
630 :
631 : /**
632 : * for_each_clear_bitrange_from - iterate over all unset bit ranges [b; e)
633 : * @b: bit offset of start of current bitrange (first set bit); must be initialized
634 : * @e: bit offset of end of current bitrange (first unset bit)
635 : * @addr: bitmap address to base the search on
636 : * @size: bitmap size in number of bits
637 : */
638 : #define for_each_clear_bitrange_from(b, e, addr, size) \
639 : for (; \
640 : (b) = find_next_zero_bit((addr), (size), (b)), \
641 : (e) = find_next_bit((addr), (size), (b) + 1), \
642 : (b) < (size); \
643 : (b) = (e) + 1)
644 :
645 : /**
646 : * for_each_set_bit_wrap - iterate over all set bits starting from @start, and
647 : * wrapping around the end of bitmap.
648 : * @bit: offset for current iteration
649 : * @addr: bitmap address to base the search on
650 : * @size: bitmap size in number of bits
651 : * @start: Starting bit for bitmap traversing, wrapping around the bitmap end
652 : */
653 : #define for_each_set_bit_wrap(bit, addr, size, start) \
654 : for ((bit) = find_next_bit_wrap((addr), (size), (start)); \
655 : (bit) < (size); \
656 : (bit) = __for_each_wrap((addr), (size), (start), (bit) + 1))
657 :
658 : /**
659 : * for_each_set_clump8 - iterate over bitmap for each 8-bit clump with set bits
660 : * @start: bit offset to start search and to store the current iteration offset
661 : * @clump: location to store copy of current 8-bit clump
662 : * @bits: bitmap address to base the search on
663 : * @size: bitmap size in number of bits
664 : */
665 : #define for_each_set_clump8(start, clump, bits, size) \
666 : for ((start) = find_first_clump8(&(clump), (bits), (size)); \
667 : (start) < (size); \
668 : (start) = find_next_clump8(&(clump), (bits), (size), (start) + 8))
669 :
670 : #endif /*__LINUX_FIND_H_ */
|
