/proc/irq/4
NameSizeModeActions
ttyS0/-0555rm
affinity_hint00444editdlrm
effective_affinity00444editdlrm
effective_affinity_list00444editdlrm
node00444editdlrm
smp_affinity00644editdlrm
smp_affinity_list00644editdlrm
spurious00444editdlrm
Edit: /proc/irq/4/spurious (0B)
count 9 unhandled 3 last_unhandled 4294697822 ms