__alloc_bootmem_node currently panics if it cant satisfy an allocation for
a particular node.  Thats rather antisocial, we should at the very least
return NULL and allow the caller to proceed (eg try another node).

A quick look at alloc_bootmem_node usage suggests we should fall back to
allocating from other nodes if it fails (as arch/alpha/kernel/pci_iommu.c
and arch/x86_64/kernel/setup64.c do).

The following patch does that.  We fall back to the regular __alloc_bootmem
when __alloc_bootmem_node fails, which means all other nodes are checked
for available memory.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>