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Thi is the report
1) with RTIRQ_NAME_LIST="rtc usb2 eno1"

RTPRIO PRI COMMAND
93 133 irq/25-xhci_hcd
90 130 irq/8-rtc0
80 120 irq/28-eno1
50 90 irq/9-acpi
50 90 irq/12-i8042
50 90 irq/1-i8042
50 90 irq/16-ehci_hcd
50 90 irq/26-0000:00:
50 90 irq/23-ehci_hcd
50 90 irq/27-mei_me
50 90 irq/29-i915

2) with RTIRQ_NAME_LIST="rtc xhci_hcd eno1"

RTPRIO PRI COMMAND
90 130 irq/8-rtc0
85 125 irq/25-xhci_hcd
80 120 irq/28-eno1
50 90 irq/9-acpi
50 90 irq/12-i8042
50 90 irq/1-i8042
50 90 irq/16-ehci_hcd
50 90 irq/26-0000:00:
50 90 irq/23-ehci_hcd
50 90 irq/27-mei_me
50 90 irq/29-i915
​
This is strange, since in the first case xhci_hcd should be at 85 priority, if RTIRQ_PRIO_DECR=5
The second case is correct.