linux-kernel - Re: [PATCH] arm64, defconfig: Increase NR

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Date:	Tue, 23 Sep 2014 12:44:31 +0200
From:	Robert Richter <rric@...nel.org>
To:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>
Cc:	Robert Richter <rrichter@...ium.com>,
	Radha Mohan Chintakuntla <rchintakuntla@...ium.com>,
	Mark Rutland <mark.rutland@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64, defconfig: Increase NR_CPUS default to 64

On 08.09.14 13:44:48, Robert Richter wrote:
> From: Robert Richter <rrichter@...ium.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.

Catalin, Will,

please consider applying this patch.

Thanks,

-Robert

> 
> Cc: Radha Mohan Chintakuntla <rchintakuntla@...ium.com>
> Cc: Mark Rutland <mark.rutland@....com>
> Signed-off-by: Robert Richter <rrichter@...ium.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"
> -- 
> 2.0.1
> 
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