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);
8
9#define BITMAP_LAST_WORD_MASK(nbits) \
10( \
11 ((nbits) % BITS_PER_LONG) ? \
12 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \
13)
14
15#define small_const_nbits(nbits) \
16 (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
17
18static inline void bitmap_zero(unsigned long *dst, int nbits)
19{
20 if (small_const_nbits(nbits))
21 *dst = 0UL;
22 else {
23 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
24 memset(dst, 0, len);
25 }
26}
27
28static inline int bitmap_weight(const unsigned long *src, int nbits)
29{
30 if (small_const_nbits(nbits))
31 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
32 return __bitmap_weight(src, nbits);
33}
34
35#endif /* _PERF_BITOPS_H */