Hi; Perhaps Im being an idiot, but it looks to me like the menu-item for SPARSE_IRQ (under General setup -> IRQ subsystem) depends solely on MAY_HAVE_SPARSE_IRQ, but I only see *one* user for that in the kernel now, the SuperH arch (arch/sh/Kconfig). It looks like everyone else explicitly sets SPARSE_IRQ. However the menu-items description implies it is a more generic option... It seems like this menu item used to appear, in a forced on state, then this condition made it disapear, leaving a blank IRQ subsystem menu for me. I was trying to work around that, but now, I am not sure exactly what is supposed to be going on here... Paul (from kernel/irq/Kconfig) config SPARSE_IRQ bool "Support sparse irq numbering" if MAY_HAVE_SPARSE_IRQ ---help--- Sparse irq numbering 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 interrupt descriptors in a more NUMA-friendly way. ) If you don't know what to do here, say N. -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html