linux-kernel - Re: [PATCH 2/3] of/numa: fix a memory@ dt node can only contains one memory block

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Date:	Thu, 26 May 2016 08:13:45 -0500
From:	Rob Herring <robh@...nel.org>
To:	Zhen Lei <thunder.leizhen@...wei.com>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>,
	Robert Richter <rrichter@...ium.com>,
	David Daney <david.daney@...ium.com>,
	Frank Rowand <frowand.list@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	devicetree <devicetree@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Zefan Li <lizefan@...wei.com>, Xinwei Hu <huxinwei@...wei.com>,
	Tianhong Ding <dingtianhong@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>
Subject: Re: [PATCH 2/3] of/numa: fix a memory@ dt node can only contains one
 memory block

On Thu, May 26, 2016 at 10:43:58AM +0800, Zhen Lei wrote:
> For a normal memory@ devicetree node, its reg property can contains more
> memory blocks.
> 
> Because we don't known how many memory blocks maybe contained, so we try
> from index=0, increase 1 until error returned(the end).
> 
> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
> ---
>  drivers/of/of_numa.c | 30 ++++++++++++++++++++----------
>  1 file changed, 20 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/of/of_numa.c b/drivers/of/of_numa.c
> index 21d831f..2c5f249 100644
> --- a/drivers/of/of_numa.c
> +++ b/drivers/of/of_numa.c
> @@ -63,7 +63,7 @@ static int __init of_numa_parse_memory_nodes(void)
>  	struct device_node *np = NULL;
>  	struct resource rsrc;
>  	u32 nid;
> -	int r = 0;
> +	int i, r = 0;
> 
>  	for (;;) {
>  		np = of_find_node_by_type(np, "memory");
> @@ -82,17 +82,27 @@ static int __init of_numa_parse_memory_nodes(void)
>  			/* some other error */
>  			break;
> 
> -		r = of_address_to_resource(np, 0, &rsrc);
> -		if (r) {
> -			pr_err("NUMA: bad reg property in memory node\n");
> -			break;
> +		for (i = 0; ; i++) {
> +			r = of_address_to_resource(np, i, &rsrc);
> +			if (r) {
> +				/* reached the end of of_address */
> +				if (i > 0) {
> +					r = 0;
> +					break;
> +				}
> +
> +				pr_err("NUMA: bad reg property in memory node\n");
> +				goto finished;
> +			}
> +
> +			r = numa_add_memblk(nid, rsrc.start,
> +					    rsrc.end - rsrc.start + 1);
> +			if (r)
> +				goto finished;
>  		}
> -
> -		r = numa_add_memblk(nid, rsrc.start,
> -				    rsrc.end - rsrc.start + 1);
> -		if (r)
> -			break;
>  	}
> +
> +finished:
>  	of_node_put(np);

This function can be simplified down to:

	for_each_node_by_type(np, "memory") {
		r = of_property_read_u32(np, "numa-node-id", &nid);
		if (r == -EINVAL)
			/*
			 * property doesn't exist if -EINVAL, continue
			 * looking for more memory nodes with
			 * "numa-node-id" property
			 */
			continue;
		else if (r)
			/* some other error */
			break;

		r = of_address_to_resource(np, 0, &rsrc);
		for (i = 0; !r; i++, r = of_address_to_resource(np, i, 
&rsrc)) {
			r = numa_add_memblk(nid, rsrc.start,
				    rsrc.end - rsrc.start + 1);
		}
	}
	of_node_put(np);

	return r;


Perhaps with a "if (!i && r) pr_err()" for an error message at the end.

Rob