bitmap_fold(9) centos man page | unix.com

BITMAP_FOLD(9)						  Basic Kernel Library Functions					    BITMAP_FOLD(9)

NAME
       bitmap_fold - fold larger bitmap into smaller, modulo specified size

SYNOPSIS
       void bitmap_fold(unsigned long * dst, const unsigned long * orig, int sz, int bits);

ARGUMENTS
       dst
	   resulting smaller bitmap

       orig
	   original larger bitmap

       sz
	   specified size

       bits
	   number of bits in each of these bitmaps

DESCRIPTION
       For each bit oldbit in orig, set bit oldbit mod sz in dst. Clear all other bits in dst. See further the comment and Example [2] for
       bitmap_onto for why and how to use this.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							    BITMAP_FOLD(9)