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SubjectRe: [PATCH 1/4] make dev_to_node return online node
please use this one instead. this one is less intrusive, and pcibus_to_node will work too
and don't need other changes.



[PATCH] make dev_to_node return online node v2

some numa system ( with multi HT chains) may return node without ram. aka it
is not online.
try to get one online node, otherwise return -1

Signed-off-by: Yinghai Lu <>

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index c163ad1..2c1a651 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -213,6 +213,9 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int do
set_mp_bus_to_node(busnum, node);
node = get_mp_bus_to_node(busnum);
+ if (node != -1 && !node_online(node))
+ node = -1;

/* Allocate per-root-bus (not per bus) arch-specific data.

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