5 #include <linux/bitops.h>
8 #define DECLARE_BITMAP(name,bits) \
9 unsigned long name[BITS_TO_LONGS(bits)]
11 int __bitmap_weight(const unsigned long *bitmap, int bits);
12 void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
13 const unsigned long *bitmap2, int bits);
14 int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
15 const unsigned long *bitmap2, unsigned int bits);
17 #define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
19 #define BITMAP_LAST_WORD_MASK(nbits) \
21 ((nbits) % BITS_PER_LONG) ? \
22 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \
25 #define small_const_nbits(nbits) \
26 (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
28 static inline void bitmap_zero(unsigned long *dst, int nbits)
30 memset(dst, 0, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
33 static inline int bitmap_weight(const unsigned long *src, int nbits)
35 if (small_const_nbits(nbits))
36 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
37 return __bitmap_weight(src, nbits);
40 static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
41 const unsigned long *src2, int nbits)
43 if (small_const_nbits(nbits))
46 __bitmap_or(dst, src1, src2, nbits);
49 static inline unsigned long *bitmap_alloc(int nbits)
51 return calloc(1, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
54 static inline int bitmap_and(unsigned long *dst, const unsigned long *src1,
55 const unsigned long *src2, unsigned int nbits)
57 if (small_const_nbits(nbits))
58 return (*dst = *src1 & *src2 & BITMAP_LAST_WORD_MASK(nbits)) != 0;
59 return __bitmap_and(dst, src1, src2, nbits);
62 static inline unsigned long _find_next_bit(const unsigned long *addr,
63 unsigned long nbits, unsigned long start, unsigned long invert)
67 if (!nbits || start >= nbits)
70 tmp = addr[start / BITS_PER_LONG] ^ invert;
72 /* Handle 1st word. */
73 tmp &= BITMAP_FIRST_WORD_MASK(start);
74 start = round_down(start, BITS_PER_LONG);
77 start += BITS_PER_LONG;
81 tmp = addr[start / BITS_PER_LONG] ^ invert;
84 return min(start + __ffs(tmp), nbits);
87 static inline unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
90 return _find_next_bit(addr, size, offset, 0UL);
93 static inline unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size,
96 return _find_next_bit(addr, size, offset, ~0UL);
99 #define find_first_bit(addr, size) find_next_bit((addr), (size), 0)
100 #define find_first_zero_bit(addr, size) find_next_zero_bit((addr), (size), 0)
102 #endif /* _PERF_BITOPS_H */