linux-kernel - Re: [PATCH] x86: Fix calculation of size of numa

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Date:	Fri, 25 Feb 2011 16:03:39 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jack Steiner <steiner@....com>, Tejun Heo <tj@...nel.org>
Cc:	yinghai@...nel.org, tglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: Fix calculation of size of numa_distance


* Jack Steiner <steiner@....com> wrote:

> Fix the calculation of the size of numa_distance array. It is 2-dimemsional
> array. This fixes early panics seen on large numa systems.
> 
> Signed-off-by: Jack Steiner <steiner@....com>
> 
> Index: linux/arch/x86/mm/numa_64.c
> ===================================================================
> --- linux.orig/arch/x86/mm/numa_64.c	2011-02-23 17:46:38.000000000 -0600
> +++ linux/arch/x86/mm/numa_64.c	2011-02-25 08:53:45.781921592 -0600
> @@ -414,7 +414,8 @@ static int __init numa_alloc_distance(vo
>  
>  	for_each_node_mask(i, nodes_parsed)
>  		cnt = i;
> -	size = ++cnt * sizeof(numa_distance[0]);
> +	cnt++;
> +	size = cnt * cnt * sizeof(numa_distance[0]);
>  
>  	phys = memblock_find_in_range(0, (u64)max_pfn_mapped << PAGE_SHIFT,
>  				      size, PAGE_SIZE);

Tejun has queued up a fix for this already. Tejun, mind sending the fix to me ASAP?

Thanks,

	Ingo
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