1 #ifndef _PERF_BITOPS_H 2 #define _PERF_BITOPS_H 3 4 #include <string.h> 5 /* ANDROID_CHANGE_BEGIN */ 6 #if 0 7 #include <linux/bitops.h> 8 #else 9 #include "bitops.h" 10 #endif 11 /* ANDROID_CHANGE_END */ 12 13 int __bitmap_weight(const unsigned long *bitmap, int bits); 14 15 #define BITMAP_LAST_WORD_MASK(nbits) \ 16 ( \ 17 ((nbits) % BITS_PER_LONG) ? \ 18 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \ 19 ) 20 21 #define small_const_nbits(nbits) \ 22 (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG) 23 24 static inline void bitmap_zero(unsigned long *dst, int nbits) 25 { 26 if (small_const_nbits(nbits)) 27 *dst = 0UL; 28 else { 29 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); 30 memset(dst, 0, len); 31 } 32 } 33 34 static inline int bitmap_weight(const unsigned long *src, int nbits) 35 { 36 if (small_const_nbits(nbits)) 37 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits)); 38 return __bitmap_weight(src, nbits); 39 } 40 41 #endif /* _PERF_BITOPS_H */ 42
