skel(9) VM Functions skel(9)NAME
mem_map_reserve, mem_map_unreserve - Manipulate flags of virtual memory
pages.
SYNOPSIS
#include <linux/mm.h>
#include <linux/wrapper.h>
#define mem_map_reserve(page_nr)
#define mem_map_unreserve(page_nr)DESCRIPTION
These macros cause a page to become reserved/unreserved. A reserved
page is reserved from any further consideration by the linux kernel,
meaning it is not scanned as potentially pageable, or available for
page allocation. The kernel treats reserved pages as memory-mapped
hardware.
It makes sense for a driver to mark a page reserved, for example, if
the driver supports mmap(2) with dynamically allocated pages that the
target device can access via DMA.
RETURN VALUE
None
AVAILABILITY
Linux 2.0+
SEE ALSOMAP_NR(9), get_free_pages(9), mmap(2)AUTHOR
Stephen Williams <steve@icarus.com>
BUGS
If a page is marked reserved, a call to free_page(9) will silenty
ignore it. If the page was originally allocated by get_free_page, you
must remember to unmark the page before releasing it to the system.
Otherwise, the page is lost.
Linux DDI $Date:$ skel(9)