Re: [PATCH] avoid warning when COMPACTION is selected

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On Fri, 3 Sep 2010 17:38:26 +0200
Andrea Arcangeli <aarcange@xxxxxxxxxx> wrote:

> From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
> 
> COMPACTION enables MIGRATION, but MIGRATION spawns a warning if numa
> or memhotplug aren't selected. However MIGRATION doesn't depend on
> them. I guess it's just trying to be strict doing a double check on
> who's enabling it, but it doesn't know that compaction also enables
> MIGRATION.
> 
> Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
> ---
> 
> diff --git a/mm/Kconfig b/mm/Kconfig
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -189,7 +189,7 @@ config COMPACTION
>  config MIGRATION
>  	bool "Page migration"
>  	def_bool y
> -	depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE
> +	depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE || COMPACTION
>  	help
>  	  Allows the migration of the physical location of pages of processes
>  	  while the virtual addresses are not changed. This is useful in

Could you please send along a copy of the warning?  It's unclear
whether it's a compiler warning or a Kconfig warning or a runtime
warning or what.

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