CONFIG_X86_X2APIC is not available for the selected architecture x86.
Result is shown for architecture x86 or 64BIT

Support x2apic

modulename: x2apic_cluster.ko

and/or

x2apic_phys.ko

configname: CONFIG_X86_X2APIC

Linux Kernel Configuration for x86
└─>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.
source code: