Badari hit a problem when configuring PAE off (ie CONFIG_4G) where the
pkmap area could end up overlapping the fixmap area.  For some reason,
PKMAP_BASE was defined statically, which seems rather pointless, and asking
for trouble.  Patch below definines it dynamically, under the fixmap area. 
The ordering of the VMALLOC_RESERVE space is:

FIXADDR_TOP
			fixed_addresses
FIXADDR_START
			temp fixed addresses
FIXADDR_BOOT_START
			Persistent kmap area
PKMAP_BASE
VMALLOC_END
			Vmalloc area
VMALLOC_START
high_memory
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>