arm64: Kconfig: support for nodes spanning other nodes

arm64: Kconfig: support for nodes spanning other nodes

[Janghyuck Kim]

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@samsung.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
+
 source "kernel/Kconfig.hz"
 
 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
-- 
2.28.0

Re: arm64: Kconfig: support for nodes spanning other nodes

[Catalin Marinas]

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@samsung.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