CONFIG_MACH_SMDK6410 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

SMDK6410

modulename: mach-smdk6410.ko

configname: CONFIG_MACH_SMDK6410

Linux Kernel Configuration
└─>SMDK6410
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
Machine support for the Samsung SMDK6410

source code:
arch/arm/mach-s3c6410/mach-smdk6410.c