On Fri, 20 Dec 2013 13:23:23 -0500
Steven Rostedt <rost...@goodmis.org> wrote:
>
> CPU 0 CPU 1
> ----- -----
> sched_setattr()
> dl_overflow()
> cpus = __dl_span_weight()
>
> cpu_down()
> raw_spin_lock()
> raw_spin_lock() /* blocks */
>
>
> overflow = __dl_overflow(cpus-1);
> raw_spin_unlock();
>
> /* gets lock */
> __dl_overflow(cpus) /* all OK! */
Forgot to add:
/* new deadline commitment added here */
>
>
>
> /* cpus goes to cpus - 1 making
> __dl_overflow() not OK anymore */
>
also should have stated:
"__dl_overflow(cpus-1) not OK anymore"
-- Steve
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