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Subject[patch 44/67] cpu to node relationship fixup: acpi_map_cpu2node

-stable review patch. If anyone has any objections, please let us know.

From: KAMEZAWA Hiroyuki <>

Problem description:

We have additional_cpus= option for allocating possible_cpus. But nid
for possible cpus are not fixed at boot time. cpus which is offlined at
boot or cpus which is not on SRAT is not tied to its node. This will
cause panic at cpu onlining.

Usually, pxm_to_nid() mapping is fixed at boot time by SRAT.

But, unfortunately, some system (my system!) do not include
full SRAT table for possible cpus. (Then, I use
additiona_cpus= option.)

For such possible cpus, pxm<->nid should be fixed at
hot-add. We now have acpi_map_pxm_to_node() which is also
used at boot. It's suitable here.

Signed-off-by: KAMEZAWA Hiroyuki <>
Cc: Tony Luck <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Greg Kroah-Hartman <>

arch/ia64/kernel/acpi.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)

--- linux-2.6.18.orig/arch/ia64/kernel/acpi.c
+++ linux-2.6.18/arch/ia64/kernel/acpi.c
@@ -771,16 +771,19 @@ int acpi_map_cpu2node(acpi_handle handle
int pxm_id;
+ int nid;

pxm_id = acpi_get_pxm(handle);
- * Assuming that the container driver would have set the proximity
- * domain and would have initialized pxm_to_node(pxm_id) && pxm_flag
+ * We don't have cpu-only-node hotadd. But if the system equips
+ * SRAT table, pxm is already found and node is ready.
+ * So, just pxm_to_nid(pxm) is OK.
+ * This code here is for the system which doesn't have full SRAT
+ * table for possible cpus.
- node_cpuid[cpu].nid = (pxm_id < 0) ? 0 : pxm_to_node(pxm_id);
+ nid = acpi_map_pxm_to_node(pxm_id);
node_cpuid[cpu].phys_id = physid;
+ node_cpuid[cpu].nid = nid;
return (0);
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