x86, srat: do not register nodes beyond e820 map

The mem= option will truncate the memory map at a specified address so
it's not possible to register nodes with memory beyond the e820 upper
bound.

unparse_node() is only called when then node had memory associated with
it, although with the mem= option it is no longer addressable.

[ Impact: fix boot hang on certain (large) systems ]

Reported-by: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Jack Steiner <steiner@sgi.com>
LKML-Reference: <alpine.DEB.2.00.0905051248150.20021@chino.kir.corp.google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/mm/srat_64.c b/arch/x86/mm/srat_64.c
index 33c5fa5..0176595 100644 (file)
--- a/arch/x86/mm/srat_64.c
+++ b/arch/x86/mm/srat_64.c
@@ -361,6 +361,7 @@ static void __init unparse_node(int node)
 {
        int i;
        node_clear(node, nodes_parsed);
+       node_clear(node, cpu_nodes_parsed);
        for (i = 0; i < MAX_LOCAL_APIC; i++) {
                if (apicid_to_node[i] == node)
                        apicid_to_node[i] = NUMA_NO_NODE;