commit 6aab341e0a28aff100a09831c5300a2994b8b986
author Linus Torvalds <torvalds@g5.osdl.org> Mon Nov 28 14:34:23 2005 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> Mon Nov 28 14:34:23 2005 -0800
tree 1af3908275aa5e1b16e80efee554a9a7504c56d4
parent 458af5439fe7ae7d95ca14106844e61f0795166c

mm: re-architect the VM_UNPAGED logic

This replaces the (in my opinion horrible) VM_UNMAPPED logic with very
explicit support for a "remapped page range" aka VM_PFNMAP.  It allows a
VM area to contain an arbitrary range of page table entries that the VM
never touches, and never considers to be normal pages.

Any user of "remap_pfn_range()" automatically gets this new
functionality, and doesn't even have to mark the pages reserved or
indeed mark them any other way.  It just works.  As a side effect, doing
mmap() on /dev/mem works for arbitrary ranges.

Sparc update from David in the next commit.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>