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Back in the days of the voluntary preempt kernel patch, there was this option to let some of the soft-IRQ service routines non threaded. I fail to tell whether it's still applicable nowadays to the PREEMPT_VOLUNTARY and PREEMPT_DESKTOP kernel configurations, which are in fact the direct remnants from those days (4-5 years ago?).

Truth is, the rtirq.conf option in subject doesn't mean a thing on PREEMPT_RT kernels and never did, so you can just ignore its intent and original purpose anyhow.

Cheers