This patch assumes that there is no valid usage of
vmalloced_or_vmaped_page->lru.

In such a case vm_struct->array could be eliminated.
It saves some memory and simplifies code a bit.

In vmap/vunmap case vm_struct->page_list is used only
in map_vm_area(), so it is ok to do:

	addr1 = vmap(pages, count);
	addr2 = vmap(pages, count);
	...
	vunmap(addr1);
	vunmap(addr2);
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>