linux-kernel - Re: [PATCHSET tip] x86, NUMA: Unify 32 and 64bit NUMA initialization

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Date:	Sat, 30 Apr 2011 09:31:50 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Tejun Heo <tj@...nel.org>
CC:	mingo@...hat.com, rientjes@...gle.com, tglx@...utronix.de,
	hpa@...or.com, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHSET tip] x86, NUMA: Unify 32 and 64bit NUMA initialization

On 04/30/2011 05:17 AM, Tejun Heo wrote:
> Hello, Yinghai.
> 
> Nice catch, but,
> 
> On Fri, Apr 29, 2011 at 01:14:14PM -0700, Yinghai Lu wrote:
>> [PATCH] x86, numa: Trim numa meminfo correctly
>>
>> During testing 32bit numa unifying code from tj, found one system with more than 64g
>> fail to use numa.
>>
>> It turn out we do not trim that numa meminfo correctly with max_pfn.
>> start could be bigger than 64g too.
>>
>> Also need to make the checking in seperated loop.
> 
> Why?

so do not need to compare them with low/high in following inner loop.


> 
> Isn't all that necessary the following?
> 
> ---
>  arch/x86/mm/numa.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: work/arch/x86/mm/numa.c
> ===================================================================
> --- work.orig/arch/x86/mm/numa.c
> +++ work/arch/x86/mm/numa.c
> @@ -278,7 +278,7 @@ int __init numa_cleanup_meminfo(struct n
>  		bi->end = min(bi->end, high);
>  
>  		/* and there's no empty block */
> -		if (bi->start == bi->end) {
> +		if (bi->start >= bi->end) {
>  			numa_remove_memblk_from(i--, mi);
>  			continue;
>  		}

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