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

Buffalo Linkstation LS-HGL

modulename: ls_hgl-setup.ko

configname: CONFIG_MACH_LINKSTATION_LS_HGL

Linux Kernel Configuration
└─>Orion Implementations
└─>Buffalo Linkstation LS-HGL
In linux kernel since version 2.6.34 (release Date: 2010-05-16)  
Say 'Y' here if you want your kernel to support the
Buffalo Linkstation LS-HGL platform.

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