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 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 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 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
