1 #ifndef _PERF_BITOPS_H
2 #define _PERF_BITOPS_H
3
4 #include <string.h>
5 #include <linux/bitops.h>
6
7 int __bitmap_weight(const unsigned long *bitmap, int bits);
8 void __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
bitmap_zero(unsigned long * dst,int nbits)20 static 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
bitmap_weight(const unsigned long * src,int nbits)30 static 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
bitmap_or(unsigned long * dst,const unsigned long * src1,const unsigned long * src2,int nbits)37 static 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 */
47