Re: [PATCH v2 1/2] mm/Kconfig: make FLATMEM depend on !NUMA

["Zi Yan" <ziy@nvidia.com>]

On Tue Aug 4, 2026 at 11:11 AM EDT, Sang-Heon Jeon wrote:
> FLATMEM + NUMA is not supported by any architecture and fails to build.
> The constraint is only implicit in the arch Kconfig files.
>
> So make it explicit in mm/Kconfig.
>
> No functional change.
>
> Suggested-by: Zi Yan <ziy@nvidia.com>
> Signed-off-by: Sang-Heon Jeon <ekffu200098@gmail.com>
> ---
>  mm/Kconfig | 2 ++
>  1 file changed, 2 insertions(+)

Hopefully no new arch will try to support it.

Acked-by: Zi Yan <ziy@nvidia.com>

>
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 060190e12bce..331daf7fcfab 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -390,6 +390,7 @@ choice
>  
>  config FLATMEM_MANUAL
>  	bool "Flat Memory"
> +	depends on !NUMA
>  	depends on !ARCH_SPARSEMEM_ENABLE || ARCH_FLATMEM_ENABLE
>  	help
>  	  This option is best suited for non-NUMA systems with
> @@ -424,6 +425,7 @@ config SPARSEMEM
>  
>  config FLATMEM
>  	def_bool y
> +	depends on !NUMA
>  	depends on !SPARSEMEM || FLATMEM_MANUAL
>  
>  #




-- 
Best Regards,
Yan, Zi