skel(9) VM Functions skel(9)NAMEMAP_NR - get memory map index for page in kernel memory
SYNOPSIS
#include <linux/mm.h>
#define MAP_NR(page)DESCRIPTION
This macro maps the page of kernel memory to an index into the mem_map
array. The input page is kernel-space page addresses such as those that
come from the get_free_page(9) function. The expression
mem_map[MAP_NR(page)] returns a pointer to a mem_map_t for the page in
question.
Device drivers need access to the page structure if it is implimenting
some special kind of memory segment, i.e. cache for a virtual frame
buffer.
RETURN VALUE
Returns an index into the mem_map array.
AVAILABILITY
Linux 2.0+
SEE ALSOget_free_pages(9)
/usr/include/asm/page.h
AUTHOR
Stephen Williams <steve@icarus.com>
BUGS
There is no check that the page you are passing really is a valid page
address.
Linux DDI $Date:$ skel(9)