From: Yang Li Date: Mon, 28 Jun 2010 23:32:57 +0000 (+0000) Subject: powerpc: Disable SPARSE_IRQ by default X-Git-Tag: Ubuntu-5.13.0-19.19~31088^2~6 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=9ce91685f9db48b7050bed916bea097fcbaea093;p=mirror_ubuntu-jammy-kernel.git 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 --- diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 328774bd41ee..6506bf4fbff1 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"