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| author | Yang Li <leoli@freescale.com> | 2010-06-28 23:32:57 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-07-08 18:11:40 +1000 |
| commit | 9ce91685f9db48b7050bed916bea097fcbaea093 (patch) | |
| tree | 7620a92ba3ea6d2ab87deb00992698d89f002722 /arch/powerpc/Kconfig | |
| parent | 5afd878a958191a3f32911f1f5f03beee5368e68 (diff) | |
| download | lwn-9ce91685f9db48b7050bed916bea097fcbaea093.tar.gz lwn-9ce91685f9db48b7050bed916bea097fcbaea093.zip | |
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>
Diffstat (limited to 'arch/powerpc/Kconfig')
| -rw-r--r-- | arch/powerpc/Kconfig | 4 |
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" |