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Subject: Re: [PATCH 2/2] arm64: mm: make pfn always valid with flat memory
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From: Chen Feng <puck.chen@hisilicon.com>
Message-ID: <57060E97.7060101@hisilicon.com>
Date: Thu, 7 Apr 2016 15:39:03 +0800
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add Mel Gorman

On 2016/4/5 16:22, Chen Feng wrote:
> Make the pfn always valid when using flat memory.
> If the reserved memory is not align to memblock-size,
> there will be holes in zone.
> 
> This patch makes the memory in buddy always in the
> array of mem-map.
> 
> Signed-off-by: Chen Feng <puck.chen@hisilicon.com>
> Signed-off-by: Fu Jun <oliver.fu@hisilicon.com>
> ---
>  arch/arm64/mm/init.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index ea989d8..0e1d5b7 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -306,7 +306,8 @@ static void __init free_unused_memmap(void)
>  	struct memblock_region *reg;
>  
>  	for_each_memblock(memory, reg) {
> -		start = __phys_to_pfn(reg->base);
> +		start = round_down(__phys_to_pfn(reg->base),
> +				   MAX_ORDER_NR_PAGES);
>  
>  #ifdef CONFIG_SPARSEMEM
>  		/*
> @@ -327,8 +328,8 @@ static void __init free_unused_memmap(void)
>  		 * memmap entries are valid from the bank end aligned to
>  		 * MAX_ORDER_NR_PAGES.
>  		 */
> -		prev_end = ALIGN(__phys_to_pfn(reg->base + reg->size),
> -				 MAX_ORDER_NR_PAGES);
> +		prev_end = round_up(__phys_to_pfn(reg->base + reg->size),
> +				    MAX_ORDER_NR_PAGES);
>  	}
>  
>  #ifdef CONFIG_SPARSEMEM
>