Summit/EXA (IBM x440)

modulename: summit_32.ko

configname: CONFIG_X86_SUMMIT

Linux Kernel Configuration
└─>Processor type and features
└─>Summit/EXA (IBM x440)
In linux kernel since version 2.6.12  
This option is needed for IBM systems that use the Summit/EXA chipset.
In particular, it is needed for the x440.

source code:
arch/x86/kernel/apic/summit_32.c