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rncbc's picture

main reason is that rtc is seldom used if at all on modern kernels and applications.

check /proc/interrupts for IRQ line 8 (rtc0) ... how many times does a cpu, any cpu core, is being interrupted by rtc ? probably only once on just a single core due on system boot, so making the rtc irq service thread on highest priority has been a pure waste of scheduler real-time priority queue range. whatever.