1 #ifndef _LINUX_BITOPS_H 2 #define _LINUX_BITOPS_H 3 #include <asm/types.h> 4 5 /* 6 * Include this here because some architectures need generic_ffs/fls in 7 * scope 8 */ 9 #include <asm/bitops.h> 10 11 static __inline__ int get_bitmask_order(unsigned int count) 12 { 13 int order; 14 15 order = fls(count); 16 return order; /* We could be slightly more clever with -1 here... */ 17 } 18 19 static __inline__ int get_count_order(unsigned int count) 20 { 21 int order; 22 23 order = fls(count) - 1; 24 if (count & (count - 1)) 25 order++; 26 return order; 27 } 28 29 static inline unsigned long hweight_long(unsigned long w) 30 { 31 return sizeof(w) == 4 ? hweight32(w) : hweight64(w); 32 } 33 34 /** 35 * rol32 - rotate a 32-bit value left 36 * @word: value to rotate 37 * @shift: bits to roll 38 */ 39 static inline __u32 rol32(__u32 word, unsigned int shift) 40 { 41 return (word << shift) | (word >> (32 - shift)); 42 } 43 44 /** 45 * ror32 - rotate a 32-bit value right 46 * @word: value to rotate 47 * @shift: bits to roll 48 */ 49 static inline __u32 ror32(__u32 word, unsigned int shift) 50 { 51 return (word >> shift) | (word << (32 - shift)); 52 } 53 54 static inline unsigned fls_long(unsigned long l) 55 { 56 if (sizeof(l) == 4) 57 return fls(l); 58 return fls64(l); 59 } 60 61 #endif 62