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Commit 9ce91685 authored by Yang Li's avatar Yang Li Committed by Benjamin Herrenschmidt
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powerpc: Disable SPARSE_IRQ by default 



The SPARSE_IRQ considerably adds overhead to critical path of IRQ
handling.  However it doesn't benefit much in space for most systems with
limited IRQ_NR.  Should be disabled unless really necessary.

Signed-off-by: default avatarLi Yang <leoli@freescale.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 5afd878a

arch/powerpc/Kconfig

+2 −2
Original line number Original line Diff line number Diff line
@@ -400,7 +400,7 @@ config IRQ_ALL_CPUS 




config SPARSE_IRQ

config SPARSE_IRQ

	bool "Support sparse irq numbering"

	bool "Support sparse irq numbering"

	default y

	default n

	help

	help

	  This enables support for sparse irqs. This is useful for distro

	  This enables support for sparse irqs. This is useful for distro

	  kernels that want to define a high CONFIG_NR_CPUS value but still

	  kernels that want to define a high CONFIG_NR_CPUS value but still
@@ -409,7 +409,7 @@ config SPARSE_IRQ 
	  ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread

	  ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread

	    out the irq_desc[] array in a more NUMA-friendly way. )

	    out the irq_desc[] array in a more NUMA-friendly way. )





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

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





config NUMA

config NUMA

	bool "NUMA support"

	bool "NUMA support"