linux-kernel - Re: arm64: Kconfig: support for nodes spanning other nodes

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Date:   Thu, 26 Nov 2020 15:31:44 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Janghyuck Kim <janghyuck.kim@...sung.com>
Cc:     hyesoo.yu@...sung.com, pullip.cho@...sung.com,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: arm64: Kconfig: support for nodes spanning other nodes

On Thu, Oct 29, 2020 at 03:19:50PM +0900, Janghyuck Kim wrote:
> To support NUMA systems whose physical address layout is not continuous
> on one node, nodes spanning other nodes feature is required.
> 
> Signed-off-by: Janghyuck Kim <janghyuck.kim@...sung.com>
> ---
>  arch/arm64/Kconfig | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 49b8d017cba6..18ff7ce9dd60 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -1004,6 +1004,14 @@ 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.  See memmap_init_zone()
> +# for details.
> +config NODES_SPAN_OTHER_NODES
> +	depends on NUMA

I guess this patch no longer makes sense after commit acd3f5c441e9 ("mm:
remove early_pfn_in_nid() and CONFIG_NODES_SPAN_OTHER_NODES").

-- 
Catalin