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 
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 
bitmap_zero(unsigned long * dst,int nbits)18 static 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 
bitmap_weight(const unsigned long * src,int nbits)28 static 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 */
36