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

From: Yinghai Lu
Date: Sat Apr 30 2011 - 12:32:31 EST


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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