Re: [RFC] [PATCH] Performance of del_timer_sync

[Andrew Morton]

"Chen, Kenneth W" <kenneth.w.chen@xxxxxxxxx> wrote:
>
> >  del_again:
>  >  	ret += del_timer(timer);
>  > +	if (!ret)
>  > +		return 0;
>  >
>  >  	for_each_cpu(i) {
>  >  		base = &per_cpu(tvec_bases, i);
> 
> 
>  Hehe ... , first thing we tried :-). But has problem that if timeout
>  function is running while del_timer_sync() is called, it returns
>  without waiting.

eh?  If del_timer() returns non-zero, that means that the timer was
successfully deleted before it triggered.
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