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

Buffalo Linkstation Mini

modulename: lsmini-setup.ko

configname: CONFIG_MACH_LINKSTATION_MINI

Linux Kernel Configuration
└─>Orion Implementations
└─>Buffalo Linkstation Mini
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
Say 'Y' here if you want your kernel to support the
Buffalo Linkstation Mini platform.

source code:
arch/arm/mach-orion5x/lsmini-setup.c