5d18c60a93
its use in upcoming code. This is inspired by something in jhb's NUMA IRQ allocation patchset. However, the tricky bit here is that the PXM lookup for a node may fail, requiring a lookup on the parent node. So if it doesn't exist, don't fail - just go up to the parent. Only error out of the lookup is the ACPI lookup returns an error. Sponsored by: Norse Corp, Inc.