linux-kernel - Re: [PATCH 4/4] cpufreq/amd-pstate: Remove the redundant amd_pstate_set

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Message-ID: <cf9c146d-bacf-444e-92e2-15ebf513af96@gmail.com>
Date: Sat, 26 Oct 2024 13:58:23 +0200
From: Klara Modin <klarasmodin@...il.com>
To: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>, gautham.shenoy@....com,
 mario.limonciello@....com, perry.yuan@....com, rafael@...nel.org,
 viresh.kumar@...aro.org
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, klara@...m.eu
Subject: Re: [PATCH 4/4] cpufreq/amd-pstate: Remove the redundant
 amd_pstate_set_driver() call

Hi,

On 2024-10-17 12:05, Dhananjay Ugwekar wrote:
> amd_pstate_set_driver() is called twice, once in amd_pstate_init() and once
> as part of amd_pstate_register_driver(). Move around code and eliminate
> the redundancy.
> 
> Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>
> ---
>   drivers/cpufreq/amd-pstate.c | 12 ++++--------
>   1 file changed, 4 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index 13ee5cac901d..6f6d961879cc 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -1848,9 +1848,11 @@ static int __init amd_pstate_init(void)
>   		return -ENODEV;
>   	}
>   
> -	ret = amd_pstate_set_driver(cppc_state);
> -	if (ret)
> +	ret = amd_pstate_register_driver(cppc_state);
> +	if (ret) {
> +		pr_err("failed to register with return %d\n", ret);
>   		return ret;
> +	}
>   
>   	/* capability check */
>   	if (cpu_feature_enabled(X86_FEATURE_CPPC)) {
> @@ -1870,12 +1872,6 @@ static int __init amd_pstate_init(void)
>   			return ret;
>   	}
>   
> -	ret = amd_pstate_register_driver(cppc_state);
> -	if (ret) {
> -		pr_err("failed to register with return %d\n", ret);
> -		return ret;
> -	}
> -
>   	dev_root = bus_get_dev_root(&cpu_subsys);
>   	if (dev_root) {
>   		ret = sysfs_create_group(&dev_root->kobj, &amd_pstate_global_attr_group);


This seems to break boot on my Zen 2 desktop (my Zen 4 laptop is fine, 
however). I don't see any messages on the console and nothing shows up 
in the pstore either.

I'll attach the kernel log from a normal boot (with the patch reverted) 
in case it helps.

Please let me know if there's anything else you need.

Regards,
Klara Modin
View attachment "no-boot-bisect" of type "text/plain" (2861 bytes)

Download attachment "dmesg.gz" of type "application/gzip" (22665 bytes)

Download attachment "config.gz" of type "application/gzip" (46051 bytes)