BITS_PER_LONG_LONG 21 include/asm-generic/bitsperlong.h #ifndef BITS_PER_LONG_LONG BITS_PER_LONG_LONG 10 include/linux/bitops.h #define BIT_ULL_MASK(nr) (1ULL << ((nr) % BITS_PER_LONG_LONG)) BITS_PER_LONG_LONG 11 include/linux/bitops.h #define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG) BITS_PER_LONG_LONG 25 include/linux/bitops.h (((~0ULL) << (l)) & (~0ULL >> (BITS_PER_LONG_LONG - 1 - (h))))