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CONFIG_SPARSE_IRQ: Support sparse irq numbering

General informations

The Linux kernel configuration item CONFIG_SPARSE_IRQ has multiple definitions:

Support sparse irq numbering found in kernel/irq/Kconfig

The configuration item CONFIG_SPARSE_IRQ:

Help text

Sparse irq numbering is useful for distro kernels that want to define a high 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.

Support sparse irq numbering found in arch/powerpc/Kconfig

The configuration item CONFIG_SPARSE_IRQ:

Help text

This enables support for sparse irqs. This is useful for distro kernels that want to define a high 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 N.

found in arch/arm/Kconfig

The configuration item CONFIG_SPARSE_IRQ:

Help text

This enables support for sparse irqs. This is useful in general as most CPUs have a fairly sparse array of IRQ vectors, which the irq_desc then maps directly on to. Systems with a high number of off-chip IRQs will want to treat this as experimental until they have been independently verified.

Support sparse irq numbering found in arch/x86/Kconfig

The configuration item CONFIG_SPARSE_IRQ:

Help text

This enables support for sparse irqs. This is useful for distro kernels that want to define a high 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 N.

found in arch/sh/Kconfig

The configuration item CONFIG_SPARSE_IRQ:

Help text

(none)

Support sparse irq numbering found in arch/sh/Kconfig

The configuration item CONFIG_SPARSE_IRQ:

Help text

This enables support for sparse irqs. This is useful in general as most CPUs have a fairly sparse array of IRQ vectors, which the irq_desc then maps directly on to. Systems with a high number of off-chip IRQs will want to treat this as experimental until they have been independently verified.

If you don't know what to do here, say N.

Hardware

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