tree 3ad05b0b5f83d174eb2a7efdfd95d09f171aa51d
parent 8603ec81487a5fefbc29611ff0d635b33b6da990
author Jeff Dike <jdike@addtoit.com> 1178488305 -0700
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1178565184 -0700

uml: speed page fault path

Give the page fault code a specialized path.  There is only one page to look
at, so there's no point in going into the general page table walking code.
There's only going to be one host operation, so there are no opportunities for
merging.  So, we go straight to the pte we want, figure out what needs doing,
and do it.

While I was in here, I fixed the wart where the address passed to unmap was a
void *, but an unsigned long to map and protect.

This gives me just under 10% on a kernel build.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>