CONFIG_MACH_SMDK2413 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
SMDK2413
modulename: mach-smdk2413.ko
configname: CONFIG_MACH_SMDK2413
Linux Kernel Configuration
└─>SAMSUNG S3C24XX SoCs Support
└─>SMDK2413
In linux kernel since version 2.6.18 (release Date: 2006-09-19)
Say Y here if you are using an SMDK2413