linux-kernel - Re: [RFT/RFC PATCH v3 3/5] cpu-topology: Move cpu topology code to common code.

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Date:   Mon, 15 Apr 2019 16:27:41 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Atish Patra <atish.patra@....com>
Cc:     linux-kernel@...r.kernel.org, Jeffrey Hugo <jhugo@...eaurora.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        devicetree@...r.kernel.org,
        Dmitriy Cherkasov <dmitriy@...-tech.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Jeremy Linton <jeremy.linton@....com>,
        Johan Hovold <johan@...nel.org>,
        linux-riscv@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Otto Sabart <ottosabart@...erm.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Will Deacon <will.deacon@....com>,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [RFT/RFC PATCH v3 3/5] cpu-topology: Move cpu topology code to
 common code.

Hi Atish,

Thanks again for doing this. Overall changes look good except a couple
of minor nit, see below.

On Wed, Mar 20, 2019 at 04:48:04PM -0700, Atish Patra wrote:
> Both RISC-V & ARM64 are using cpu-map device tree to describe
> their cpu topology. It's better to move the relevant code to
> a common place instead of duplicate code.
> 
> Signed-off-by: Atish Patra <atish.patra@....com>
> Tested-by: Jeffrey Hugo <jhugo@...eaurora.org>
> ---
>  arch/arm64/include/asm/topology.h |  23 ---
>  arch/arm64/kernel/topology.c      | 303 +-----------------------------
>  drivers/base/arch_topology.c      | 298 ++++++++++++++++++++++++++++-
>  drivers/base/topology.c           |   1 +
>  include/linux/arch_topology.h     |  28 +++
>  5 files changed, 330 insertions(+), 323 deletions(-)
> 

[...]

> diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
> index edfcf8d9..6cc6a860 100644
> --- a/drivers/base/arch_topology.c
> +++ b/drivers/base/arch_topology.c
> @@ -6,8 +6,8 @@
>   * Written by: Juri Lelli, ARM Ltd.
>   */
>  
> -#include <linux/acpi.h>
>  #include <linux/arch_topology.h>
> +#include <linux/acpi.h>
>  #include <linux/cpu.h>
>  #include <linux/cpufreq.h>
>  #include <linux/device.h>
> @@ -16,6 +16,11 @@
>  #include <linux/string.h>
>  #include <linux/sched/topology.h>
>  #include <linux/cpuset.h>
> +#include <linux/cpumask.h>
> +#include <linux/init.h>
> +#include <linux/percpu.h>
> +#include <linux/sched.h>
> +#include <linux/smp.h>
>  
>  DEFINE_PER_CPU(unsigned long, freq_scale) = SCHED_CAPACITY_SCALE;
>  
> @@ -278,3 +283,294 @@ static void parsing_done_workfn(struct work_struct *work)
>  #else
>  core_initcall(free_raw_capacity);
>  #endif
> +
> +#if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)

Why can't the above one be just GENERIC_ARCH_TOPOLOGY ?
I may be missing to find it myself, but would like to know.

> +
> +#if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)

Ditto.

--
Regards,
Sudeep