[PATCH] x86_64: Handle empty node zero
From: Daniel Yeisley <dan.yeisley@unisys.com>
It is possible to boot a Unisys ES7000 with CPUs from multiple cells, and not
also include the memory from those cells. This can create a scenario where
node 0 has cpus, but no associated memory. The system will boot fine in a
configuration where node 0 has memory, but nodes 2 and 3 do not.
[AK: I rechecked the code and generic code seems to indeed handle that already.
Dan's original patch had a change for mm/slab.c that seems to be already in now.]
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/x86_64/mm/srat.c b/arch/x86_64/mm/srat.c
index e151353..474df22 100644
--- a/arch/x86_64/mm/srat.c
+++ b/arch/x86_64/mm/srat.c
@@ -399,8 +399,10 @@
/* First clean up the node list */
for (i = 0; i < MAX_NUMNODES; i++) {
cutoff_node(i, start, end);
- if ((nodes[i].end - nodes[i].start) < NODE_MIN_SIZE)
+ if ((nodes[i].end - nodes[i].start) < NODE_MIN_SIZE) {
unparse_node(i);
+ node_set_offline(i);
+ }
}
if (acpi_numa <= 0)