BITMAP_POS_TO_ORD(9)              Basic Kernel Library Functions             BITMAP_POS_TO_ORD(9)



NAME
       bitmap_pos_to_ord - find ordinal of set bit at given position in bitmap

SYNOPSIS
       int bitmap_pos_to_ord(const unsigned long * buf, unsigned int pos, unsigned int nbits);

ARGUMENTS
       buf
           pointer to a bitmap

       pos
           a bit position in buf (0 <= pos < nbits)

       nbits
           number of valid bit positions in buf

DESCRIPTION
       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.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                      BITMAP_POS_TO_ORD(9)