(Comment changes only)

The bootmem allocator is initialised before the kernel virtual address
space has been fully established.  As a result, any allocations which are
made before paging_init() has completed may point to invalid kernel
addresses.  This patch notes this limitation and indicates where the
allocator is fully available.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>