linux-kernel - Re: [PATCH v4 5/5] mm: enable CONFIG_MOVABLE

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Date:   Wed, 12 Oct 2016 00:17:31 +1100
From:   Balbir Singh <bsingharora@...il.com>
To:     Reza Arbab <arbab@...ux.vnet.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Bharata B Rao <bharata@...ux.vnet.ibm.com>,
        Nathan Fontenot <nfont@...ux.vnet.ibm.com>,
        Stewart Smith <stewart@...ux.vnet.ibm.com>,
        Alistair Popple <apopple@....ibm.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Tang Chen <tangchen@...fujitsu.com>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        devicetree@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v4 5/5] mm: enable CONFIG_MOVABLE_NODE on non-x86 arches



On 07/10/16 05:36, Reza Arbab wrote:
> To support movable memory nodes (CONFIG_MOVABLE_NODE), at least one of
> the following must be true:
> 
> 1. We're on x86. This arch has the capability to identify movable nodes
>    at boot by parsing the ACPI SRAT, if the movable_node option is used.
> 
> 2. Our config supports memory hotplug, which means that a movable node
>    can be created by hotplugging all of its memory into ZONE_MOVABLE.
> 
> Fix the Kconfig definition of CONFIG_MOVABLE_NODE, which currently
> recognizes (1), but not (2).
> 
> Signed-off-by: Reza Arbab <arbab@...ux.vnet.ibm.com>
> ---
>  mm/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/Kconfig b/mm/Kconfig
> index be0ee11..5d0818f 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -153,7 +153,7 @@ config MOVABLE_NODE
>  	bool "Enable to assign a node which has only movable memory"
>  	depends on HAVE_MEMBLOCK
>  	depends on NO_BOOTMEM
> -	depends on X86_64
> +	depends on X86_64 || MEMORY_HOTPLUG
>  	depends on NUMA
>  	default n
>  	help
> 

Acked-by: Balbir Singh <bsingharora@...il.com>