linux-kernel - Re: [PATCH V2 07/11] hwmon: (coretemp) Remove redundant pdata->cpu

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Date: Sun, 4 Feb 2024 06:47:24 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Zhang Rui <rui.zhang@...el.com>
Cc: jdelvare@...e.com, fenghua.yu@...el.com, linux-hwmon@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 07/11] hwmon: (coretemp) Remove redundant
 pdata->cpu_map[]

On Fri, Feb 02, 2024 at 05:21:40PM +0800, Zhang Rui wrote:
> pdata->cpu_map[] saves the mapping between cpu core id and the index in
> pdata->core_data[]. This is used to find the temp_data structure using
> cpu_core_id, by traversing the pdata->cpu_map[] array. But the same goal
> can be achieved by traversing the pdata->core_temp[] array directly.
> 
> Remove redundant pdata->cpu_map[].
> 
> No functional change.
> 
> Signed-off-by: Zhang Rui <rui.zhang@...el.com>

Applied.

Thanks,
Guenter

> ---
>  drivers/hwmon/coretemp.c | 16 ++++++----------
>  1 file changed, 6 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
> index cdd1e069d5c1..29ee8e0c0fe9 100644
> --- a/drivers/hwmon/coretemp.c
> +++ b/drivers/hwmon/coretemp.c
> @@ -96,7 +96,6 @@ struct temp_data {
>  struct platform_data {
>  	struct device		*hwmon_dev;
>  	u16			pkg_id;
> -	u16			cpu_map[NUM_REAL_CORES];
>  	struct ida		ida;
>  	struct cpumask		cpumask;
>  	struct temp_data	*core_data[MAX_CORE_DATA];
> @@ -517,7 +516,6 @@ static int create_core_data(struct platform_device *pdev, unsigned int cpu,
>  		if (index < 0)
>  			return index;
>  
> -		pdata->cpu_map[index] = topology_core_id(cpu);
>  		index += BASE_SYSFS_ATTR_NO;
>  	}
>  
> @@ -696,7 +694,7 @@ static int coretemp_cpu_offline(unsigned int cpu)
>  	struct platform_device *pdev = coretemp_get_pdev(cpu);
>  	struct platform_data *pd;
>  	struct temp_data *tdata;
> -	int i, indx = -1, target;
> +	int i, target;
>  
>  	/* No need to tear down any interfaces for suspend */
>  	if (cpuhp_tasks_frozen)
> @@ -707,18 +705,16 @@ static int coretemp_cpu_offline(unsigned int cpu)
>  	if (!pd->hwmon_dev)
>  		return 0;
>  
> -	for (i = 0; i < NUM_REAL_CORES; i++) {
> -		if (pd->cpu_map[i] == topology_core_id(cpu)) {
> -			indx = i + BASE_SYSFS_ATTR_NO;
> +	for (i = BASE_SYSFS_ATTR_NO; i < MAX_CORE_DATA; i++) {
> +		if (pd->core_data[i] && pd->core_data[i]->cpu_core_id == topology_core_id(cpu))
>  			break;
> -		}
>  	}
>  
>  	/* Too many cores and this core is not populated, just return */
> -	if (indx < 0)
> +	if (i == MAX_CORE_DATA)
>  		return 0;
>  
> -	tdata = pd->core_data[indx];
> +	tdata = pd->core_data[i];
>  
>  	cpumask_clear_cpu(cpu, &pd->cpumask);
>  
> @@ -729,7 +725,7 @@ static int coretemp_cpu_offline(unsigned int cpu)
>  	 */
>  	target = cpumask_any_and(&pd->cpumask, topology_sibling_cpumask(cpu));
>  	if (target >= nr_cpu_ids) {
> -		coretemp_remove_core(pd, indx);
> +		coretemp_remove_core(pd, i);
>  	} else if (tdata && tdata->cpu == cpu) {
>  		mutex_lock(&tdata->update_lock);
>  		tdata->cpu = target;