linux-kernel - Re: [PATCH] arm64: Kconfig: Enable NODES_SPAN_OTHER

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Message-ID: <20200206102340.GA17074@willie-the-truck>
Date:   Thu, 6 Feb 2020 10:23:40 +0000
From:   Will Deacon <will@...nel.org>
To:     Hoan Tran <Hoan@...amperecomputing.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        patches@...amperecomputing.com
Subject: Re: [PATCH] arm64: Kconfig: Enable NODES_SPAN_OTHER_NODES config for
 NUMA

On Mon, Feb 03, 2020 at 11:55:14AM -0800, Hoan Tran wrote:
> Some NUMA nodes have memory ranges that span other nodes.
> Even though a pfn is valid and between a node's start and end pfns,
> it may not reside on that node.
> 
> This patch enables NODES_SPAN_OTHER_NODES config for NUMA to support
> this type of NUMA layout.
> 
> Signed-off-by: Hoan Tran <Hoan@...amperecomputing.com>
> ---
>  arch/arm64/Kconfig | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index e688dfa..939d28f 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -959,6 +959,13 @@ config NEED_PER_CPU_EMBED_FIRST_CHUNK
>  config HOLES_IN_ZONE
>  	def_bool y
>  
> +# Some NUMA nodes have memory ranges that span other nodes.
> +# Even though a pfn is valid and between a node's start and end pfns,
> +# it may not reside on that node.
> +config NODES_SPAN_OTHER_NODES
> +	def_bool y
> +	depends on ACPI_NUMA
> +

I thought we agreed to do this in the core code?

https://lore.kernel.org/lkml/1562887528-5896-1-git-send-email-Hoan@os.amperecomputing.com

Will