After William did the remap_pfn_range change, a very common pattern became:
	page = page_to_pfn(vmalloc_to_page((void *)pos));
	if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) {

the patch below adds a very simple helper, vmalloc_to_pfn() to simplify this
a bit.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>