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    SubjectDeleting timers
    Thomas:

    The major difference -- in fact, almost the only difference -- between
    del_timer() and try_to_del_timer_sync() is that try_to_del_timer_sync
    returns a special code (-1) if the timer couldn't be deleted because it
    is currently running, whereas del_timer doesn't check this.

    Furthermore, the "_sync" in the name suggests that
    try_to_del_timer_sync will wait until a running timer has finished,
    which it clearly does not do.

    Despite these facts, the kerneldoc for try_to_del_timer_sync states
    that it must not be called in interrupt context. Why not? Isn't that
    advice simply wrong?

    With this in mind, would there be any objection if I renamed it to
    try_to_del_timer(), removed the comment forbidding it to be used in
    interrupt context, and made it available even on non-SMP builds?

    Alan Stern

    P.S.: The only other difference is that del_timer calls
    timer_stats_timer_clear_start_info. Why doesn't try_to_del_timer_sync
    do the same thing?



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