linux-kernel - Re: [PATCH v8 11/13] arm64: topology: enable ACPI/PPTT based CPU topology

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Date:   Thu, 3 May 2018 10:41:43 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Jeremy Linton <jeremy.linton@....com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
        Hanjun Guo <hanjun.guo@...aro.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Will Deacon <Will.Deacon@....com>,
        Catalin Marinas <Catalin.Marinas@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <Mark.Rutland@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-riscv@...ts.infradead.org, wangxiongfeng2@...wei.com,
        vkilari@...eaurora.org, Al Stone <ahs3@...hat.com>,
        Dietmar Eggemann <Dietmar.Eggemann@....com>,
        Morten Rasmussen <Morten.Rasmussen@....com>, palmer@...ive.com,
        Len Brown <lenb@...nel.org>,
        John Garry <john.garry@...wei.com>, austinwc@...eaurora.org,
        tnowicki@...iumnetworks.com, jhugo@....qualcomm.com,
        timur@....qualcomm.com, Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: [PATCH v8 11/13] arm64: topology: enable ACPI/PPTT based CPU topology

On Thu, May 3, 2018 at 12:35 AM, Jeremy Linton <jeremy.linton@....com> wrote:
> Hi,
>
>
> On 05/02/2018 03:24 AM, Rafael J. Wysocki wrote:
>>
>> On Tue, May 1, 2018 at 4:46 PM, Sudeep Holla <sudeep.holla@....com> wrote:
>>>
>>>
>>>
>>> On 26/04/18 00:31, Jeremy Linton wrote:
>>>>
>>>> Propagate the topology information from the PPTT tree to the
>>>> cpu_topology array. We can get the thread id and core_id by assuming
>>>> certain levels of the PPTT tree correspond to those concepts.
>>>> The package_id is flagged in the tree and can be found by calling
>>>> find_acpi_cpu_topology_package() which terminates
>>>> its search when it finds an ACPI node flagged as the physical
>>>> package. If the tree doesn't contain enough levels to represent
>>>> all of the requested levels then the root node will be returned
>>>> for all subsequent levels.
>>>>
>>>
>>> Acked-by: Sudeep Holla <sudeep.holla@....com>
>>>
>>> [..]
>>>
>>>> @@ -304,6 +345,8 @@ void __init init_cpu_topology(void)
>>>>         * Discard anything that was parsed if we hit an error so we
>>>>         * don't use partial information.
>>>>         */
>>>> -     if (of_have_populated_dt() && parse_dt_topology())
>>>> +     if ((!acpi_disabled) && parse_acpi_topology())
>>>
>>>
>>> [nit] not sure if extra () is need above,
>>
>>
>> No, it isn't.
>>
>>> but I am fine either way.
>>
>>
>> The redundant parens need to go away, really.
>>
>
> Yah, I missed this one, is there a linter everyone is using that finds
> these?

I'm not actually sure.  At least I can't recall any right away.