powerpc: Disable SPARSE_IRQ by default

The SPARSE_IRQ considerably adds overhead to critical path of IRQ
handling.  However it doesn't benefit much in space for most systems with
limited IRQ_NR.  Should be disabled unless really necessary.

Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 328774bd41ee..6506bf4fbff1 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -400,7 +400,7 @@ config IRQ_ALL_CPUS
 
 config SPARSE_IRQ
         bool "Support sparse irq numbering"
-        default y
+        default n
         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
@@ -409,7 +409,7 @@ config SPARSE_IRQ
           ( 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.
+          If you don't know what to do here, say N.
 
 config NUMA
         bool "NUMA support"