CONFIG_MACH_SMDKC100 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
SMDKC100
modulename: mach-smdkc100.ko
configname: CONFIG_MACH_SMDKC100
Linux Kernel Configuration
└─>SMDKC100
In linux kernel since version 2.6.32 (release Date: 2009-12-02)
Machine support for the Samsung SMDKC100