Re: [PATCH 06/10] PM / OPP: Add dev_pm_opp_get_sharing_cpus()

[Stephen Boyd]

On 04/21, Viresh Kumar wrote:
> diff --git a/drivers/base/power/opp/cpu.c b/drivers/base/power/opp/cpu.c
> index 55cbf9bd8707..9c4eb90759fb 100644
> --- a/drivers/base/power/opp/cpu.c
> +++ b/drivers/base/power/opp/cpu.c
> @@ -329,3 +329,48 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
>  	return ret;
>  }
>  EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus);
> +
> +/**
> + * dev_pm_opp_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with @cpu_dev
> + * @cpu_dev:	CPU device for which we do this operation
> + * @cpumask:	cpumask to update with information of sharing CPUs
> + *
> + * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev.
> + *
> + * Returns -ENODEV if OPP table isn't already present.
> + *
> + * Locking: The internal opp_table and opp structures are RCU protected.
> + * Hence this function internally uses RCU updater strategy with mutex locks
> + * to keep the integrity of the internal data structures. Callers should ensure
> + * that this function is *NOT* called under RCU protection or in contexts where
> + * mutex cannot be locked.
> + */
> +int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)

Is there a reason we use cpumask_var_t instead of struct cpumask *
here? My understanding is that cpumask_var_t is for stack
declarations.

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