The PREEMPT_RT patch set has only a handful patches left until it can be
enabled on the X86 Architecture at the time of writing.
The work has not finished once the patches are fully merged. A new issue
is how to not break parts of PREEMPT_RT in future development by making
assumption which are not compatible or lead to large latencies.
Another problem is how to address limitations on PREEMPT_RT like the
big softirq/ bottom halves lock which can lead to high latencies.
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