linux-kernel - Re: [PATCH] cpufreq: vexpress-spc: Fix wrong alternation of policy->related

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Date:   Wed, 27 Nov 2019 18:45:42 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     Dietmar Eggemann <dietmar.eggemann@....com>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Liviu Dudau <liviu.dudau@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Lukasz Luba <lukasz.luba@....com>, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: vexpress-spc: Fix wrong alternation of
 policy->related_cpus during CPU hp

On Wed, Nov 27, 2019 at 03:40:29PM +0000, Sudeep Holla wrote:
> 
> diff --git i/arch/arm/mach-vexpress/spc.c w/arch/arm/mach-vexpress/spc.c
> index 354e0e7025ae..e0e2e789a0b7 100644
> --- i/arch/arm/mach-vexpress/spc.c
> +++ w/arch/arm/mach-vexpress/spc.c
> @@ -551,8 +551,9 @@ static struct clk *ve_spc_clk_register(struct device *cpu_dev)
> 
>  static int __init ve_spc_clk_init(void)
>  {
> -       int cpu;
> +       int cpu, cluster;
>         struct clk *clk;
> +       bool init_opp_table[MAX_CLUSTERS] = { false };
> 
>         if (!info)
>                 return 0; /* Continue only if SPC is initialised */
> @@ -578,8 +579,17 @@ static int __init ve_spc_clk_init(void)
>                         continue;
>                 }
> 
> +               cluster = topology_physical_package_id(cpu_dev->id);
> +               if (init_opp_table[cluster])
> +                       continue;
> +
>                 if (ve_init_opp_table(cpu_dev))
>                         pr_warn("failed to initialise cpu%d opp table\n", cpu);
> +               else if (dev_pm_opp_set_sharing_cpus(cpu_dev,
> +                        topology_core_cpumask(cpu_dev->id)))
> +                       pr_warn("failed to mark OPPs shared for cpu%d\n", cpu);

missing else here, found when I was looking at the patch to stash/commit
locally.

> +
> +               init_opp_table[cluster] = true;
>         }
> 
>         platform_device_register_simple("vexpress-spc-cpufreq", -1, NULL, 0);

--
Regards,
Sudeep