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powerpc: Disable SPARSE_IRQ by default

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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: Li Yang <leoli@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Yang Li 2010-06-28 23:32:57 +00:00 committed by Benjamin Herrenschmidt
parent 5afd878a95
commit 9ce91685f9
1 changed files with 2 additions and 2 deletions
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arch/powerpc/Kconfig
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@ -400,7 +400,7 @@ config IRQ_ALL_CPUS
config SPARSE_IRQ
bool "Support sparse irq numbering"
default y
default n
help
This enables support for sparse irqs. This is useful for distro
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
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
bool "NUMA support"