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

CONFIG_SAMSUNG_CLKSRC (not configurable)

modulename: clock-clksrc.ko

configname: CONFIG_SAMSUNG_CLKSRC

Linux Kernel Configuration
└─>SAMSUNG_CLKSRC
In linux kernel since version 2.6.34 (release Date: 2010-05-16)  
Select the clock code for the clksrc implementation
used by newer systems such as the S3C64XX.

source code:
arch/arm/plat-samsung/clock-clksrc.c