linux-kernel - Re: [PATCH] x86: numa: drop ZONE

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Message-ID: <alpine.DEB.2.02.1406081524580.21744@chino.kir.corp.google.com>
Date:	Sun, 8 Jun 2014 15:25:50 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Luiz Capitulino <lcapitulino@...hat.com>
cc:	akpm@...ux-foundation.org, andi@...stfloor.org, riel@...hat.com,
	yinghai@...nel.org, isimatu.yasuaki@...fujitsu.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] x86: numa: drop ZONE_ALIGN

On Sun, 8 Jun 2014, Luiz Capitulino wrote:

> diff --git a/arch/x86/include/asm/numa.h b/arch/x86/include/asm/numa.h
> index 4064aca..01b493e 100644
> --- a/arch/x86/include/asm/numa.h
> +++ b/arch/x86/include/asm/numa.h
> @@ -9,7 +9,6 @@
>  #ifdef CONFIG_NUMA
>  
>  #define NR_NODE_MEMBLKS		(MAX_NUMNODES*2)
> -#define ZONE_ALIGN (1UL << (MAX_ORDER+PAGE_SHIFT))
>  
>  /*
>   * Too small node sizes may confuse the VM badly. Usually they
> diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
> index 1d045f9..69f6362 100644
> --- a/arch/x86/mm/numa.c
> +++ b/arch/x86/mm/numa.c
> @@ -200,8 +200,6 @@ static void __init setup_node_data(int nid, u64 start, u64 end)
>  	if (end && (end - start) < NODE_MIN_SIZE)
>  		return;
>  
> -	start = roundup(start, ZONE_ALIGN);
> -
>  	printk(KERN_INFO "Initmem setup node %d [mem %#010Lx-%#010Lx]\n",
>  	       nid, start, end - 1);
>  

What ensures this start address is page aligned from the BIOS?
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