CONFIG_MACH_N30 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Acer N30

modulename: mach-n30.ko

configname: CONFIG_MACH_N30

Linux Kernel Configuration
└─>S3C24XX Implementations
└─>Acer N30
In linux kernel since version 2.6.12  
Say Y here if you are using the Acer N30

<http://zoo.weinigel.se/n30>.

source code:
arch/arm/mach-s3c2410/mach-n30.c