x86, sparseirq: clean up Kconfig entry

Impact: improve help text

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

1 files changed, 7 insertions, 3 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index d14a8806227d..e4c038abb71c 100644
--- 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"