menuconfig RT_USING_CLOCK_TIME
    bool "Using unified clock_time subsystem"
    default n
    help
        Enable the unified clock_time subsystem which consolidates
        hwtimer, ktime, and cputime into a single coherent framework.
        
        This subsystem provides:
        - Clocksource: Free-running counter for timekeeping
        - Clockevent: Programmable timeout events
        - High-resolution timers (hrtimer)
        - POSIX clock support
        - Boottime tracking
        - CPU time APIs (clock_cpu_*, rt_cputime_*)
        - Boottime APIs (rt_boottime_*)