1 #ifndef _PERF_BITOPS_H 2 #define _PERF_BITOPS_H 3 4 #include <string.h> 5 #include <linux/bitops.h> 6 7 #define DECLARE_BITMAP(name,bits) \ 8 unsigned long name[BITS_TO_LONGS(bits)] 9 10 int __bitmap_weight(const unsigned long *bitmap, int bits); 11 void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1, 12 const unsigned long *bitmap2, int bits); 13 14 #define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1))) 15 16 #define BITMAP_LAST_WORD_MASK(nbits) \ 17 ( \ 18 ((nbits) % BITS_PER_LONG) ? \ 19 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \ 20 ) 21 22 #define small_const_nbits(nbits) \ 23 (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG) 24 25 static inline void bitmap_zero(unsigned long *dst, int nbits) 26 { 27 if (small_const_nbits(nbits)) 28 *dst = 0UL; 29 else { 30 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); 31 memset(dst, 0, len); 32 } 33 } 34 35 static inline int bitmap_weight(const unsigned long *src, int nbits) 36 { 37 if (small_const_nbits(nbits)) 38 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits)); 39 return __bitmap_weight(src, nbits); 40 } 41 42 static inline void bitmap_or(unsigned long *dst, const unsigned long *src1, 43 const unsigned long *src2, int nbits) 44 { 45 if (small_const_nbits(nbits)) 46 *dst = *src1 | *src2; 47 else 48 __bitmap_or(dst, src1, src2, nbits); 49 } 50 51 /** 52 * test_and_set_bit - Set a bit and return its old value 53 * @nr: Bit to set 54 * @addr: Address to count from 55 */ 56 static inline int test_and_set_bit(int nr, unsigned long *addr) 57 { 58 unsigned long mask = BIT_MASK(nr); 59 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); 60 unsigned long old; 61 62 old = *p; 63 *p = old | mask; 64 65 return (old & mask) != 0; 66 } 67 68 #endif /* _PERF_BITOPS_H */ 69