CONFIG_CLOCKSOURCE_WATCHDOG is not available for thedefaultarchitecture x86.
Result is shown for architecture i386

CONFIG_CLOCKSOURCE_WATCHDOG (not configurable)

configname: CONFIG_CLOCKSOURCE_WATCHDOG

Linux Kernel Configuration
└─>CLOCKSOURCE_WATCHDOG
In linux kernel since version 2.6.21 (release Date: 2007-04-25)