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static unsigned long round_jiffies_common(unsigned long j, bool force_up)

{

    int rem;

    unsigned long original = j;

    rem = j % HZ;

    /*

     * If the target jiffie is just after a whole second (which can happen

     * due to delays of the timer irq, long irq off times etc etc) then

     * we should round down to the whole second, not up. Use 1/4th second

     * as cutoff for this rounding as an extreme upper bound for this.

     * But never round down if @force_up is set.

     */

    if (rem < HZ/4 && !force_up) /* round down */

            j = j - rem;

    else /* round up */

            j = j - rem + HZ;

    if (j <= GetTimerTicks()) /* rounding ate our timeout entirely; */

            return original;

    return j;

}

unsigned long round_jiffies_up_relative(unsigned long j);