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Re: [PATCH v3 06/10] drivers base/arch_topology: allow inlining cpu-invariant accounting support

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On 27-07-17, 20:33, Dietmar Eggemann wrote:
> Allow inlining of topology_get_cpu_scale() into the task
> scheduler fast path (e.g. __update_load_avg_se()) by coding it as a
> static inline function in the arch topology header file.
> 
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Juri Lelli <juri.lelli@arm.com>
> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
> ---
>  drivers/base/arch_topology.c  | 7 +------
>  include/linux/arch_topology.h | 8 +++++++-
>  2 files changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
> index af9ab98a233e..c8cd92ba4cc0 100644
> --- a/drivers/base/arch_topology.c
> +++ b/drivers/base/arch_topology.c
> @@ -37,12 +37,7 @@ void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq,
>  }
>  
>  static DEFINE_MUTEX(cpu_scale_mutex);
> -static DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
> -
> -unsigned long topology_get_cpu_scale(struct sched_domain *sd, int cpu)
> -{
> -	return per_cpu(cpu_scale, cpu);
> -}
> +DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
>  
>  void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity)
>  {
> diff --git a/include/linux/arch_topology.h b/include/linux/arch_topology.h
> index 3e3c2657c9a1..0c4e43d6a3bb 100644
> --- a/include/linux/arch_topology.h
> +++ b/include/linux/arch_topology.h
> @@ -11,8 +11,14 @@ void topology_normalize_cpu_scale(void);
>  struct device_node;
>  int topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu);
>  
> +DECLARE_PER_CPU(unsigned long, cpu_scale);
> +
>  struct sched_domain;
> -unsigned long topology_get_cpu_scale(struct sched_domain *sd, int cpu);
> +static inline
> +unsigned long topology_get_cpu_scale(struct sched_domain *sd, int cpu)
> +{
> +	return per_cpu(cpu_scale, cpu);
> +}
>  
>  void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity);

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

-- 
viresh

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[PATCH v3 06/10] drivers base/arch_topology: allow inlining cpu-invariant accounting support Dietmar Eggemann <dietmar.eggemann@arm.com> - 2017-07-27 21:40 +0200
  Re: [PATCH v3 06/10] drivers base/arch_topology: allow inlining  cpu-invariant accounting support Viresh Kumar <viresh.kumar@linaro.org> - 2017-07-28 10:30 +0200

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