|BITMAP_POS_TO_ORD(9)||Basic Kernel Library Functions||BITMAP_POS_TO_ORD(9)|
bitmap_pos_to_ord - find ordinal of set bit at given position in bitmap
int bitmap_pos_to_ord(const unsigned long * buf, unsigned int pos, unsigned int nbits);
Map the bit at position pos in buf (of length nbits) to the ordinal of which set bit it is. If it is not set or if pos is not a valid bit position, map to -1.
If for example, just bits 4 through 7 are set in buf, then pos values 4 through 7 will get mapped to 0 through 3, respectively, and other pos values will get mapped to -1. When pos value 7 gets mapped to (returns) ord value 3 in this example, that means that bit 7 is the 3rd (starting with 0th) set bit in buf.
The bit positions 0 through bits are valid positions in buf.
|January 2017||Kernel Hackers Manual 4.8.|