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x86 kernels on IBM Summit based systems will only online 1 CPU because the phys_cpu_present_map is not set up correctly. Patch below applied to 2.6.26-git10. Signed-off-by: Chris McDermott <lcm@linux.vnet.ibm.com> Tested-by: Tim Pepper <lnxninga@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>