linux-kernel - Re: [PATCH 12/12] cpufreq/amd-pstate: Remove the unncecessary driver_lock in amd_pstate_update

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Message-ID: <Z6nfB9tbb6uwv2xY@BLRRASHENOY1.amd.com>
Date: Mon, 10 Feb 2025 16:42:07 +0530
From: "Gautham R. Shenoy" <gautham.shenoy@....com>
To: Dhananjay Ugwekar <dhananjay.ugwekar@....com>
Cc: mario.limonciello@....com, rafael@...nel.org, viresh.kumar@...aro.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH 12/12] cpufreq/amd-pstate: Remove the unncecessary
 driver_lock in amd_pstate_update_limits

On Wed, Feb 05, 2025 at 11:25:23AM +0000, Dhananjay Ugwekar wrote:
> There is no need to take a driver wide lock while updating the
> highest_perf value in the percpu cpudata struct. Hence remove it.

Yup!

Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>

-- 
Thanks and Regards
gautham.
> 
> Signed-off-by: Dhananjay Ugwekar <dhananjay.ugwekar@....com>
> ---
>  drivers/cpufreq/amd-pstate.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index ee7e3f0a4c0a..08ae48076812 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -832,8 +832,6 @@ static void amd_pstate_update_limits(unsigned int cpu)
>  	if (!policy)
>  		return;
>  
> -	guard(mutex)(&amd_pstate_driver_lock);
> -
>  	if (amd_get_highest_perf(cpu, &cur_high))
>  		return;
>  
> -- 
> 2.34.1
>