====== Default IRQ affinity ======

The ''irqaffinity'' kernel parameter can be used to specify a
default set of CPUs which are allowed to handle the incoming IRQs. The
parameter argument is a CPU list:

  irqaffinity=<cpu number>,….,<cpu number>


References:

  * [[https://docs.kernel.org/admin-guide/kernel-parameters.html#cpu-lists|cpu lists in The kernel's command-line parameters]]
  * [[https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/kernel/irq/irqdesc.c|kernel/irq/irqdesc.c]]
  * see ''irq_default_affinity'' in the sources
  * see ''/proc/irq/default_smp_affinity'' in [[https://docs.kernel.org/core-api/irq/irq-affinity.html|SMP IRQ affinity]]
  * [[realtime:documentation:howto:tools:cpu-partitioning:procfs|smp_affinity in procfs]]