linux-kernel - Re: [PATCH 2/2] arm64: mm: make pfn always valid with flat memory

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Date:	Mon, 11 Apr 2016 19:08:38 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Chen Feng <puck.chen@...ilicon.com>
CC:	<catalin.marinas@....com>, <will.deacon@....com>,
	<ard.biesheuvel@...aro.org>, <mark.rutland@....com>,
	<akpm@...ux-foundation.org>, <robin.murphy@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <mhocko@...e.com>,
	<kirill.shutemov@...ux.intel.com>, <rientjes@...gle.com>,
	<linux-mm@...ck.org>, <dan.zhao@...ilicon.com>,
	<puck.chen@...mail.com>, <suzhuangluan@...ilicon.com>,
	<linuxarm@...wei.com>, <saberlily.xia@...ilicon.com>,
	<oliver.fu@...ilicon.com>, <yudongbin@...licon.com>
Subject: Re: [PATCH 2/2] arm64: mm: make pfn always valid with flat memory

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@...ilicon.com>
> Signed-off-by: Fu Jun <oliver.fu@...ilicon.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)

How about let free_unused_memmap() support for CONFIG_SPARSEMEM_VMEMMAP?

Thanks,
Xishi Qiu

>  	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