[PATCH 1/2] arm64: mem-model: add flatmem model for arm64

[puck.chen@hisilicon.com (Chen Feng)]

add Mel Gorman

On 2016/4/5 16:22, Chen Feng wrote:
> We can reduce the memory allocated at mem-map
> by flatmem.
> 
> currently, the default memory-model in arm64 is
> sparse memory. The mem-map array is not freed in
> this scene. If the physical address is too long,
> it will reserved too much memory for the mem-map
> array.
> 
> Signed-off-by: Chen Feng <puck.chen@hisilicon.com>
> Signed-off-by: Fu Jun <oliver.fu@hisilicon.com>
> ---
>  arch/arm64/Kconfig | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 4f43622..c18930d 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -559,6 +559,9 @@ config ARCH_SPARSEMEM_ENABLE
>  	def_bool y
>  	select SPARSEMEM_VMEMMAP_ENABLE
>  
> +config ARCH_FLATMEM_ENABLE
> +	def_bool y
> +
>  config ARCH_SPARSEMEM_DEFAULT
>  	def_bool ARCH_SPARSEMEM_ENABLE
>  
>