From 9ce91685f9db48b7050bed916bea097fcbaea093 Mon Sep 17 00:00:00 2001 From: Yang Li Date: Mon, 28 Jun 2010 23:32:57 +0000 Subject: [PATCH] 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 Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/Kconfig | 4 ++-- 1 file 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" -- 2.11.4.GIT