From cd015707176820b86d07b5dffdecfefdd539a497 Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Tue, 13 Oct 2009 19:45:03 +0000 Subject: powerpc: Enable sparse irq_descs on powerpc Defining CONFIG_SPARSE_IRQ enables generic code that gets rid of the static irq_desc array, and replaces it with an array of pointers to irq_descs. It also allows node local allocation of irq_descs, however we currently don't have the information available to do that, so we just allocate them on all on node 0. Signed-off-by: Michael Ellerman Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/Kconfig | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'arch/powerpc/Kconfig') diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 3aa79f8e39e4..61abde11a45e 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -377,6 +377,19 @@ config IRQ_ALL_CPUS CPU. Generally saying Y is safe, although some problems have been reported with SMP Power Macintoshes with this option enabled. +config SPARSE_IRQ + bool "Support sparse irq numbering" + default y + 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 + want to have low kernel memory footprint on smaller machines. + + ( 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. + config NUMA bool "NUMA support" depends on PPC64 -- cgit v1.2.3