linux-kernel - Re: [PATCH 02/26] x86-64, NUMA: Simplify hotplug node handling in acpi_numa_memory_affinity

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Date:	Sat, 12 Feb 2011 09:47:07 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Tejun Heo <tj@...nel.org>
CC:	linux-kernel@...r.kernel.org, x86@...nel.org, brgerst@...il.com,
	gorcunov@...il.com, shaohui.zheng@...el.com, rientjes@...gle.com,
	mingo@...e.hu, hpa@...ux.intel.com
Subject: Re: [PATCH 02/26] x86-64, NUMA: Simplify hotplug node handling in
 acpi_numa_memory_affinity_init()

On 02/12/2011 09:10 AM, Tejun Heo wrote:
> Hotplug node handling in acpi_numa_memory_affinity_init() was
> unnecessarily complicated with storing the original nodes[] entry and
> restoring it afterwards.  Simplify it by not modifying the nodes[]
> entry for hotplug nodes from the beginning.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Yinghai Lu <yinghai@...nel.org>
> Cc: Brian Gerst <brgerst@...il.com>
> Cc: Cyrill Gorcunov <gorcunov@...il.com>
> Cc: Shaohui Zheng <shaohui.zheng@...el.com>
> Cc: David Rientjes <rientjes@...gle.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: H. Peter Anvin <hpa@...ux.intel.com>
> ---
>  arch/x86/mm/srat_64.c |   31 +++++++++++++------------------
>  1 files changed, 13 insertions(+), 18 deletions(-)
> 
> diff --git a/arch/x86/mm/srat_64.c b/arch/x86/mm/srat_64.c
> index 9a97261..e3e0dd3 100644
> --- a/arch/x86/mm/srat_64.c
> +++ b/arch/x86/mm/srat_64.c
> @@ -251,7 +251,7 @@ update_nodes_add(int node, unsigned long start, unsigned long end)
>  void __init
>  acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
>  {
> -	struct bootnode *nd, oldnode;
> +	struct bootnode *nd;
>  	unsigned long start, end;
>  	int node, pxm;
>  	int i;
> @@ -289,28 +289,23 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
>  		bad_srat();
>  		return;
>  	}
> -	nd = &nodes[node];
> -	oldnode = *nd;
> -	if (!node_test_and_set(node, nodes_parsed)) {
> -		nd->start = start;
> -		nd->end = end;
> -	} else {
> -		if (start < nd->start)
> -			nd->start = start;
> -		if (nd->end < end)
> -			nd->end = end;
> -	}
>  
>  	printk(KERN_INFO "SRAT: Node %u PXM %u %lx-%lx\n", node, pxm,
>  	       start, end);
>  
> -	if (ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) {
> +	if (!(ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)) {
> +		nd = &nodes[node];
> +		if (!node_test_and_set(node, nodes_parsed)) {
> +			nd->start = start;
> +			nd->end = end;
> +		} else {
> +			if (start < nd->start)
> +				nd->start = start;
> +			if (nd->end < end)
> +				nd->end = end;
> +		}
> +	} else
>  		update_nodes_add(node, start, end);
> -		/* restore nodes[node] */
> -		*nd = oldnode;
> -		if ((nd->start | nd->end) == 0)
> -			node_clear(node, nodes_parsed);
> -	}
>  
>  	node_memblk_range[num_node_memblks].start = start;
>  	node_memblk_range[num_node_memblks].end = end;

after change
looks like nodes_parsed is not set anymore for node that only have hotplug memory.

Thanks

Yinghai
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