Hello,

On Mon, Jan 25, 2016 at 04:44:50PM +0100, Petr Mladek wrote:

timer_pending() checks whether the list of callbacks is empty.
Each callback is removed from the list before it is called,
see call_timer_fn() in __run_timers().

Sometimes we need to make sure that the callback has finished.
For example, if we want to free some resources that are accessed
by the callback.

For this purpose, this patch adds timer_active(). It checks both
the list of callbacks and the running_timer. It takes the base_lock
to see a consistent state.

I plan to use it to implement delayed works in kthread worker.
But I guess that it will have wider use. In fact, I wonder if
timer_pending() is misused in some situations.

I don't think this is still necessary.  More on this later.

Thanks.

-- 
tejun

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