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Date:   Wed, 6 Sep 2023 09:38:17 +0100
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Keyon Jie <yang.jie@linux.intel.com>
Cc:     Doug Smythies <dsmythies@telus.net>, stable@vger.kernel.org,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>
Subject: Re: [PATCH] cpufreq: intel_pstate: set stale CPU frequency to minimum
Message-ID: <2023090607-virus-earshot-268d@gregkh>
References: <20230906001646.338935-1-yang.jie@linux.intel.com>
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On Tue, Sep 05, 2023 at 05:16:46PM -0700, Keyon Jie wrote:
> From: Doug Smythies <dsmythies@telus.net>
> 
> commit d51847acb018d83186e4af67bc93f9a00a8644f7 upstream.
> 
> This fix applies to all stable kernel versions 5.18+.
> 
> The intel_pstate CPU frequency scaling driver does not
> use policy->cur and it is 0.
> When the CPU frequency is outdated arch_freq_get_on_cpu()
> will default to the nominal clock frequency when its call to
> cpufreq_quick_getpolicy_cur returns the never updated 0.
> Thus, the listed frequency might be outside of currently
> set limits. Some users are complaining about the high
> reported frequency, albeit stale, when their system is
> idle and/or it is above the reduced maximum they have set.
> 
> This patch will maintain policy_cur for the intel_pstate
> driver at the current minimum CPU frequency.
> 
> Reported-by: Yang Jie <yang.jie@linux.intel.com>
> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217597
> Signed-off-by: Doug Smythies <dsmythies@telus.net>
> [ rjw: White space damage fixes and comment adjustment ]
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
> ---
>  drivers/cpufreq/intel_pstate.c | 5 +++++
>  1 file changed, 5 insertions(+)

What stable kernel(s) is this for?