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authorYang Li <leoli@freescale.com>2010-06-28 23:32:57 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-07-08 18:11:40 +1000
commit9ce91685f9db48b7050bed916bea097fcbaea093 (patch)
tree7620a92ba3ea6d2ab87deb00992698d89f002722
parent5afd878a958191a3f32911f1f5f03beee5368e68 (diff)
downloadlinux-linaro-9ce91685f9db48b7050bed916bea097fcbaea093.tar.gz
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: Li Yang <leoli@freescale.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--arch/powerpc/Kconfig4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 328774bd41e..6506bf4fbff 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -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"