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
7#define DECLARE_BITMAP(name,bits) \
8 unsigned long name[BITS_TO_LONGS(bits)]
9
10int __bitmap_weight(const unsigned long *bitmap, int bits);
11void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
12 const unsigned long *bitmap2, int bits);
13
14#define BITMAP_LAST_WORD_MASK(nbits) \
15( \
16 ((nbits) % BITS_PER_LONG) ? \
17 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \
18)
19
20#define small_const_nbits(nbits) \
21 (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
22
23static inline void bitmap_zero(unsigned long *dst, int nbits)
24{
25 if (small_const_nbits(nbits))
26 *dst = 0UL;
27 else {
28 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
29 memset(dst, 0, len);
30 }
31}
32
33static inline int bitmap_weight(const unsigned long *src, int nbits)
34{
35 if (small_const_nbits(nbits))
36 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
37 return __bitmap_weight(src, nbits);
38}
39
40static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
41 const unsigned long *src2, int nbits)
42{
43 if (small_const_nbits(nbits))
44 *dst = *src1 | *src2;
45 else
46 __bitmap_or(dst, src1, src2, nbits);
47}
48
49#endif /* _PERF_BITOPS_H */