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Subject[regression 4.14rc] 74def747bcd0 (genirq: Restrict effective affinity to interrupts actually using it)

Fedora rawhide config here.
AMD FX-8370E

Bisected a problem to:
74def747bcd0 (genirq: Restrict effective affinity to interrupts actually using it)

It seems to be causing stalls, short lived or long lived lockups very shortly after boot.
Everything becomes jerky.

The only visible in the log indication is something like :
[ 59.802129] clocksource: timekeeping watchdog on CPU3: Marking clocksource 'tsc' as unstable because the skew is too large:
[ 59.802134] clocksource: 'hpet' wd_now: 3326e7aa wd_last: 329956f8 mask: ffffffff
[ 59.802137] clocksource: 'tsc' cs_now: 423662bc6f cs_last: 41dfc91650 mask: ffffffffffffffff
[ 59.802140] tsc: Marking TSC unstable due to clocksource watchdog
[ 59.802158] TSC found unstable after boot, most likely due to broken BIOS. Use 'tsc=unstable'.
[ 59.802161] sched_clock: Marking unstable (59802142067, 15510)<-(59920871789, -118714277)
[ 60.015604] clocksource: Switched to clocksource hpet
[ 89.015994] INFO: NMI handler (perf_event_nmi_handler) took too long to run: 209.660 msecs
[ 89.016003] perf: interrupt took too long (1638003 > 2500), lowering kernel.perf_event_max_sample_rate to 1000

Just reverting that commit on top of linus mainline cures all the symptoms

- Yanko

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