CONFIG_X86_X2APIC is not available for thedefaultarchitecture x86.
Result is shown for architecture 64BIT

Support x2apic

modulename: x2apic_phys.ko

and/or

x2apic_cluster.ko

configname: CONFIG_X86_X2APIC

Linux Kernel Configuration
└─>Processor type and features
└─>Support x2apic
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
This enables x2apic support on CPUs that have this feature.

This allows 32-bit apic IDs (so it can support very large systems),
and accesses the local apic via MSRs not via mmio.

If you don't know what to do here, say N.