skel

Section: VM Functions (9)
Updated: $Date:$
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NAME

MAP_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 ALSO

get_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.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
AVAILABILITY
SEE ALSO
AUTHOR
BUGS
LinuxReviews : manual page archive : man9