.@paulmckrcu Would it be possible to do "norcu" as "synchronize on every return to userspace and every cpu_idle entry"?
Mainly frustration that embed/dt/server systems need huge complex feedback system "designed for...hundreds or thousands of CPUs"
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...when they would perform at least as well, and much more predictably, with simple rwlocks or similar.
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You could write a SMP RCU for small systems. However, it would still have CPU stall warnings. Not clear it would help you.
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It seems like, in principle, TINY_RCU+locks should work for SMP.
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In practice, as discussed earlier, use of lock for RCU in Linux kernel gets you deadlock, etc.
End of conversation
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