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    Subjectquestion about periodic clocks
    How does the clock period get set on periodic timers?  In my clock
    driver, I'm seeing a call to ->set_mode(CLOCK_EVT_MODE_PERIODIC, evt),
    but then... nothing. I was expecting a call to set_next_event to set
    the timer period.

    The calltrace is:

    #0 xen_new_set_mode (mode=CLOCK_EVT_MODE_PERIODIC, evt=0xc10a2ac0)
    at arch/i386/xen/time.c:275
    #1 0xc01323da in clockevents_set_mode (dev=0xc10a2ac0,
    mode=CLOCK_EVT_MODE_PERIODIC) at kernel/time/clockevents.c:64
    #2 0xc0132854 in tick_setup_periodic (dev=0xc10a2ac0,
    broadcast=<value optimized out>) at kernel/time/tick-common.c:111

    and tick_setup_periodic does just call clockevents_set_mode, but nothing
    to set a period.

    Am I supposed to assume some default period? HZ? (That's what hpet
    seems to do.)

    Is set_next_event only ever called if the timer is in ONESHOT mode?

    Thanks,
    J
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