CONFIG_MACH_VSTMS is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
VMSTMS
modulename: mach-vstms.ko
configname: CONFIG_MACH_VSTMS
Linux Kernel Configuration
└─>S3C2412 Machines
└─>VMSTMS
In linux kernel since version 2.6.19 (release Date: 2006-11-29)
Say Y here if you are using an VSTMS board