* Daniel Walker <[email protected]> wrote:
> I don't know. irqs_off_preempt_count() could get used someplace else,
> where you would want to flip the preempt_count() check .. It seems
> sane to combine your patch with mine ..
>
> irqs_off_preempt_count() (!__get_cpu_var(trace_cpu_idle) &&
> preempt_count())
>
> You can't call __get_cpu_var() without the a positive preempt_count(),
> so the check seems backwards regardless of the other factors ..
yeah. The whole trace_preempt_enter_idle() thing looks a bit suspect.
Why cannot those architectures simply disable/enable preemption and get
the same effect? It's not like we ever want to allow the preemption of
the idle task.
and once that is solved, irqs_off_preempt_count() can again include the
hardirq and preempt count check only and doesnt have to check the
idle_cpu flag. This would make the whole thing simpler and would avoid
silly bugs like this.
Ingo
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