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Message-ID: <9e65a37b8220943a540cc3aaf660a79cef4041dc.camel@linux.intel.com>
Subject: Re: [PATCH] thermal: intel: powerclamp: Fix cpumask and max_idle
 module parameters
From:   srinivas pandruvada <srinivas.pandruvada@linux.intel.com>
To:     David Arcari <darcari@redhat.com>, linux-pm@vger.kernel.org
Cc:     "Rafael J. Wysocki" <rafael@kernel.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Amit Kucheria <amitk@kernel.org>,
        Zhang Rui <rui.zhang@intel.com>, Chen Yu <yu.c.chen@intel.com>,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org
Date:   Thu, 30 Mar 2023 10:36:33 -0700
In-Reply-To: <20230330134218.1897786-1-darcari@redhat.com>
References: <20230330134218.1897786-1-darcari@redhat.com>
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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.=C2=A0 This can easily be fixed
> by checking to see if the mask has already been allocated in the
> init routine.
>=20
> 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.
>=20
> Fixes: ebf519710218 ("thermal: intel: powerclamp: Add two module
> parameters")
>=20
> Signed-off-by: David Arcari <darcari@redhat.com>
Reviewed-by: Srinivas Pandruvada<srinivas.pandruvada@linux.intel.com>

>=20
> Cc: "Rafael J. Wysocki" <rafael@kernel.org>
> Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
> Cc: Amit Kucheria <amitk@kernel.org>
> Cc: Zhang Rui <rui.zhang@intel.com>
> Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
> Cc: David Arcari <darcari@redhat.com>
> Cc: Chen Yu <yu.c.chen@intel.com>
> Cc: linux-kernel@vger.kernel.org
> Cc: stable@vger.kernel.org
>=20
> ---
> =C2=A0drivers/thermal/intel/intel_powerclamp.c | 9 ++++++++-
> =C2=A01 file changed, 8 insertions(+), 1 deletion(-)
>=20
> 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)
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0goto skip_limit_set;
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0}
> =C2=A0
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (!cpumask_available(idle_in=
jection_cpu_mask)) {
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0ret =3D
> allocate_copy_idle_injection_mask(cpu_present_mask);
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0if (ret)
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0goto skip=
_limit_set;
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0}
> +
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (check_invalid(idle_in=
jection_cpu_mask, new_max_idle)) {
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0ret =3D -EINVAL;
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0goto skip_limit_set;
> @@ -791,7 +797,8 @@ static int __init powerclamp_init(void)
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0return retval;
> =C2=A0
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0mutex_lock(&powerclamp_lo=
ck);
> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0retval =3D allocate_copy_idle_=
injection_mask(cpu_present_mask);
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (!cpumask_available(idle_in=
jection_cpu_mask))
> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0retval =3D
> allocate_copy_idle_injection_mask(cpu_present_mask);
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0mutex_unlock(&powerclamp_=
lock);
> =C2=A0
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (retval)