Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef _PERF_BITOPS_H
2#define _PERF_BITOPS_H
3
4#include <string.h>
5#include <linux/bitops.h>
6
7int __bitmap_weight(const unsigned long *bitmap, int bits);
8void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
9 const unsigned long *bitmap2, int bits);
10
11#define BITMAP_LAST_WORD_MASK(nbits) \
12( \
13 ((nbits) % BITS_PER_LONG) ? \
14 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \
15)
16
17#define small_const_nbits(nbits) \
18 (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
19
20static inline void bitmap_zero(unsigned long *dst, int nbits)
21{
22 if (small_const_nbits(nbits))
23 *dst = 0UL;
24 else {
25 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
26 memset(dst, 0, len);
27 }
28}
29
30static inline int bitmap_weight(const unsigned long *src, int nbits)
31{
32 if (small_const_nbits(nbits))
33 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
34 return __bitmap_weight(src, nbits);
35}
36
37static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
38 const unsigned long *src2, int nbits)
39{
40 if (small_const_nbits(nbits))
41 *dst = *src1 | *src2;
42 else
43 __bitmap_or(dst, src1, src2, nbits);
44}
45
46#endif /* _PERF_BITOPS_H */