• Feng Tang's avatar
    timekeeping: Add persistent_clock_exist flag · 31ade306
    Feng Tang authored
    In current kernel, there are several places which need to check
    whether there is a persistent clock for the platform. Current check
    is done by calling the read_persistent_clock() and validating its
    return value.
    
    So one optimization is to do the check only once in timekeeping_init(),
    and use a flag persistent_clock_exist to record it.
    
    v2: Add a has_persistent_clock() helper function, as suggested by John.
    
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: John Stultz <john.stultz@linaro.org>
    Signed-off-by: default avatarFeng Tang <feng.tang@intel.com>
    Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
    31ade306
timekeeping.c 36 KB