linux-kernel - Re: [PATCH] thermal: intel: powerclamp: Fix cpumask and max

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Date:   Thu, 30 Mar 2023 20:06:18 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>,
        David Arcari <darcari@...hat.com>
Cc:     linux-pm@...r.kernel.org, "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>, Chen Yu <yu.c.chen@...el.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] thermal: intel: powerclamp: Fix cpumask and max_idle
 module parameters

On Thu, Mar 30, 2023 at 7:36 PM srinivas pandruvada
<srinivas.pandruvada@...ux.intel.com> wrote:
>
> On Thu, 2023-03-30 at 09:42 -0400, David Arcari wrote:
> Reviewed-by: Srinivas Pandruvada <>> When cpumask is specified as a module parameter the value is
> > overwritten by the module init routine.  This can easily be fixed
> > by checking to see if the mask has already been allocated in the
> > init routine.
> >
> > When max_idle is specified as a module parameter a panic will occur.
> > The problem is that the idle_injection_cpu_mask is not allocated
> > until
> > the module init routine executes. This can easily be fixed by
> > allocating
> > the cpumask if it's not already allocated.
> >
> > Fixes: ebf519710218 ("thermal: intel: powerclamp: Add two module
> > parameters")
> >
> > Signed-off-by: David Arcari <darcari@...hat.com>
> Reviewed-by: Srinivas Pandruvada<srinivas.pandruvada@...ux.intel.com>

Applied as 6.3-rc material, thanks!

> > Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> > Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
> > Cc: Amit Kucheria <amitk@...nel.org>
> > Cc: Zhang Rui <rui.zhang@...el.com>
> > Cc: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> > Cc: David Arcari <darcari@...hat.com>
> > Cc: Chen Yu <yu.c.chen@...el.com>
> > Cc: linux-kernel@...r.kernel.org
> > Cc: stable@...r.kernel.org
> >
> > ---
> >  drivers/thermal/intel/intel_powerclamp.c | 9 ++++++++-
> >  1 file changed, 8 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/thermal/intel/intel_powerclamp.c
> > b/drivers/thermal/intel/intel_powerclamp.c
> > index c7ba5680cd48..91fc7e239497 100644
> > --- a/drivers/thermal/intel/intel_powerclamp.c
> > +++ b/drivers/thermal/intel/intel_powerclamp.c
> > @@ -235,6 +235,12 @@ static int max_idle_set(const char *arg, const
> > struct kernel_param *kp)
> >                 goto skip_limit_set;
> >         }
> >
> > +       if (!cpumask_available(idle_injection_cpu_mask)) {
> > +               ret =
> > allocate_copy_idle_injection_mask(cpu_present_mask);
> > +               if (ret)
> > +                       goto skip_limit_set;
> > +       }
> > +
> >         if (check_invalid(idle_injection_cpu_mask, new_max_idle)) {
> >                 ret = -EINVAL;
> >                 goto skip_limit_set;
> > @@ -791,7 +797,8 @@ static int __init powerclamp_init(void)
> >                 return retval;
> >
> >         mutex_lock(&powerclamp_lock);
> > -       retval = allocate_copy_idle_injection_mask(cpu_present_mask);
> > +       if (!cpumask_available(idle_injection_cpu_mask))
> > +               retval =
> > allocate_copy_idle_injection_mask(cpu_present_mask);
> >         mutex_unlock(&powerclamp_lock);
> >
> >         if (retval)
>