[PATCH] arm64, defconfig: Increase NR_CPUS default to 64
rric at kernel.org
Tue Sep 23 03:44:31 PDT 2014
On 08.09.14 13:44:48, Robert Richter wrote:
> From: Robert Richter <rrichter at cavium.com>
> Raising the current maximum limit to 64. This is needed for Cavium's
> Thunder systems that will have at least 48 cores per die.
> The change keeps the current memory footprint in cpu mask structures.
> It does not break existing code. Setting the maximum to 64 cpus still
> boots systems with less cpus.
> Mark's Juno happily booted with a NR_CPUS=64 kernel.
> Tested on our Thunder system with 48 cores. We could see interrupts to
> all cores.
please consider applying this patch.
> Cc: Radha Mohan Chintakuntla <rchintakuntla at cavium.com>
> Cc: Mark Rutland <mark.rutland at arm.com>
> Signed-off-by: Robert Richter <rrichter at cavium.com>
> arch/arm64/Kconfig | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index fd4e81a4e1ce..67fca2ea81a7 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -252,11 +252,11 @@ config SCHED_SMT
> places. If unsure say N here.
> config NR_CPUS
> - int "Maximum number of CPUs (2-32)"
> - range 2 32
> + int "Maximum number of CPUs (2-64)"
> + range 2 64
> depends on SMP
> # These have to remain sorted largest to smallest
> - default "8"
> + default "64"
> config HOTPLUG_CPU
> bool "Support for hot-pluggable CPUs"
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