linux-kernel - Re: [PATCH v3 3/6] arch_topology: update CPU map to use of_cpu_phandle_to

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Message-ID: <20250718121419.00007bfe@huawei.com>
Date: Fri, 18 Jul 2025 12:14:19 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Alireza Sanaee <alireza.sanaee@...wei.com>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<coresight@...ts.linaro.org>, <dianders@...omium.org>,
	<james.clark@...aro.org>, <krzk@...nel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-perf-users@...r.kernel.org>,
	<linuxarm@...wei.com>, <mark.rutland@....com>, <mike.leach@...aro.org>,
	<robh@...nel.org>, <ruanjinjie@...wei.com>, <saravanak@...gle.com>,
	<shameerali.kolothum.thodi@...wei.com>, <suzuki.poulose@....com>
Subject: Re: [PATCH v3 3/6] arch_topology: update CPU map to use
 of_cpu_phandle_to_id

On Fri, 18 Jul 2025 10:48:45 +0100
Alireza Sanaee <alireza.sanaee@...wei.com> wrote:

> Refactor get_cpu_for_node to use of_cpu_phandle_to_id instead of
> of_cpu_node_to_id.

If respinning, perhaps link this to the fact it's enabled by
the cpu_node no longer being used if we fail to get the related
cpu id as enabled by previous patch.

> 
> Signed-off-by: Alireza Sanaee <alireza.sanaee@...wei.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>

> ---
>  drivers/base/arch_topology.c | 13 ++++++-------
>  1 file changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
> index 6fafd86f608a..72bf23cdf469 100644
> --- a/drivers/base/arch_topology.c
> +++ b/drivers/base/arch_topology.c
> @@ -474,20 +474,19 @@ static unsigned int max_smt_thread_num = 1;
>  static int __init get_cpu_for_node(struct device_node *node)
>  {
>  	int cpu;
> -	struct device_node *cpu_node __free(device_node) =
> -		of_parse_phandle(node, "cpu", 0);
> +	struct device_node *cpu_node = NULL;
>  
> -	if (!cpu_node)
> -		return -1;
> -
> -	cpu = of_cpu_node_to_id(cpu_node);
> -	if (cpu < 0) {
> +	cpu = of_cpu_phandle_to_id(node, &cpu_node, 0);
> +	if (cpu == -ENODEV) {
>  		pr_info("CPU node exist but the possible cpu range is :%*pbl\n",
>  			cpumask_pr_args(cpu_possible_mask));
>  		return cpu;
> +	} else if (cpu < 0) {
> +		return -1;
>  	}
>  
>  	topology_parse_cpu_capacity(cpu_node, cpu);
> +	of_node_put(cpu_node);
>  	return cpu;
>  }
>