From: David Rientjes <rientjes@google.com>

Clear node_possible_map if numa_emulation() fails for some reason, such as
a failed hash shift, but setup_node_range() has already set some fake nodes
as online.

Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Eric Dumazet <dada1@cosmosbay.com>
Cc: Christoph Lameter <clameter@engr.sgi.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/x86_64/mm/numa.c |    1 +
 1 files changed, 1 insertion(+)

diff -puN arch/x86_64/mm/numa.c~x86_64-set-node_possible_map-at-runtime-fix arch/x86_64/mm/numa.c
--- a/arch/x86_64/mm/numa.c~x86_64-set-node_possible_map-at-runtime-fix
+++ a/arch/x86_64/mm/numa.c
@@ -500,6 +500,7 @@ void __init numa_initmem_init(unsigned l
 #ifdef CONFIG_NUMA_EMU
 	if (cmdline && !numa_emulation(start_pfn, end_pfn))
  		return;
+	nodes_clear(node_possible_map);
 #endif
 
 #ifdef CONFIG_ACPI_NUMA
_