linux-kernel - Re: [PATCH v3] cpufreq: amd-pstate: Fix min_perf assignment in amd_pstate_adjust

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Date: Mon, 12 Feb 2024 16:41:49 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Mario Limonciello <mario.limonciello@....com>, Tor Vic <torvic9@...lbox.org>
Cc: Perry.Yuan@....com, ray.huang@....com, gautham.shenoy@....com, 
	rafael.j.wysocki@...el.com, linux-kernel@...r.kernel.org, 
	linux-pm@...r.kernel.org, Oleksandr Natalenko <oleksandr@...alenko.name>
Subject: Re: [PATCH v3] cpufreq: amd-pstate: Fix min_perf assignment in amd_pstate_adjust_perf()

On Fri, Feb 9, 2024 at 4:50 PM Mario Limonciello
<mario.limonciello@....com> wrote:
>
> On 2/9/2024 09:42, Tor Vic wrote:
> > In the function amd_pstate_adjust_perf(), the 'min_perf' variable is set
> > to 'highest_perf' instead of 'lowest_perf'.
> >
> > Cc: <stable@...r.kernel.org> # 6.1+
> > Fixes: 1d215f0319c2 ("cpufreq: amd-pstate: Add fast switch function for AMD P-State")
> > Reported-by: Oleksandr Natalenko <oleksandr@...alenko.name>
> > Reviewed-by: Perry Yuan <Perry.Yuan@....com>
> > Signed-off-by: Tor Vic <torvic9@...lbox.org>
> Reviewed-by: Mario Limonciello <mario.limonciello@....com>
> > ---
> > v2->v3: Resend with git, misconfigured mail client borked v2
> > v1->v2: Add Perry's 'Reviewed-by' and 'Cc: stable' tag
> > ---
> >   drivers/cpufreq/amd-pstate.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> > index 08e112444c27..aa5e57e27d2b 100644
> > --- a/drivers/cpufreq/amd-pstate.c
> > +++ b/drivers/cpufreq/amd-pstate.c
> > @@ -577,7 +577,7 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
> >       if (target_perf < capacity)
> >               des_perf = DIV_ROUND_UP(cap_perf * target_perf, capacity);
> >
> > -     min_perf = READ_ONCE(cpudata->highest_perf);
> > +     min_perf = READ_ONCE(cpudata->lowest_perf);
> >       if (_min_perf < capacity)
> >               min_perf = DIV_ROUND_UP(cap_perf * _min_perf, capacity);
> >

Applied as 6.9 material, thanks!