linux/kernel/irq/Kconfig

config HAVE_GENERIC_HARDIRQS
	def_bool n

if HAVE_GENERIC_HARDIRQS
menu "IRQ subsystem"
#
# Interrupt subsystem related configuration options
#
config GENERIC_HARDIRQS
       def_bool y

# Select this to disable the deprecated stuff
config GENERIC_HARDIRQS_NO_DEPRECATED
       def_bool n

# Options selectable by the architecture code
config HAVE_SPARSE_IRQ
       def_bool n

config GENERIC_IRQ_PROBE
	def_bool n

config GENERIC_PENDING_IRQ
	def_bool n

config AUTO_IRQ_AFFINITY
       def_bool n

config IRQ_PER_CPU
       def_bool n

config HARDIRQS_SW_RESEND
       def_bool n

config SPARSE_IRQ
	bool "Support sparse irq numbering"
	depends on HAVE_SPARSE_IRQ
	---help---

	  Sparse irq numbering is useful for distro kernels that want
	  to define a high CONFIG_NR_CPUS value but still want to have
	  low kernel memory footprint on smaller machines.

	  ( Sparse irqs can also be beneficial on NUMA boxes, as they spread
	    out the interrupt descriptors in a more NUMA-friendly way. )

	  If you don't know what to do here, say N.

endmenu
endif