x86, sparseirq: clean up Kconfig entry

Impact: improve help text

Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index d14a8806227d0530ab4e0eedaac2703a7592f2b7..e4c038abb71c10ece08c93bbaac496365c95bb19 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -242,10 +242,14 @@ config SPARSE_IRQ
        bool "Support sparse irq numbering"
        depends on PCI_MSI || HT_IRQ
        help
-         This enables support for sparse irq, esp for msi/msi-x. You may need
-         if you have lots of cards supports msi-x installed.
+         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.
 
-         If you don't know what to do here, say Y.
+         ( 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.
 
 config NUMA_MIGRATE_IRQ_DESC
        bool "Move irq desc when changing irq smp_affinity"