linux-kernel - Re: [PATCH v7 1/4] cpu/SMT: Provide a default topology_is_primary

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Message-ID: <87h68ruwp2.ffs@tglx>
Date: Fri, 01 Nov 2024 10:31:37 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Yicong Yang <yangyicong@...wei.com>, catalin.marinas@....com,
 will@...nel.org, sudeep.holla@....com, peterz@...radead.org,
 mpe@...erman.id.au, linux-arm-kernel@...ts.infradead.org,
 mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
 pierre.gondois@....com, dietmar.eggemann@....com
Cc: yangyicong@...ilicon.com, linuxppc-dev@...ts.ozlabs.org, x86@...nel.org,
 linux-kernel@...r.kernel.org, morten.rasmussen@....com, msuchanek@...e.de,
 gregkh@...uxfoundation.org, rafael@...nel.org,
 jonathan.cameron@...wei.com, prime.zeng@...ilicon.com,
 linuxarm@...wei.com, xuwei5@...wei.com, guohanjun@...wei.com
Subject: Re: [PATCH v7 1/4] cpu/SMT: Provide a default
 topology_is_primary_thread()

On Fri, Nov 01 2024 at 11:18, Yicong Yang wrote:
> On 2024/10/31 21:33, Thomas Gleixner wrote:
>> cpu_smt_control is not guaranteed to have CPU_SMT_ENABLED state, so this
>> argument is bogus.
>> 
> sorry for didn't explain all the cases here.
>
> For cpu_sm_control == {CPU_SMT_ENABLED, CPU_SMT_NOT_SUPPORTED, CPU_SMT_NOT_IMPLEMENTED},
> all the cpu's bootable and we won't check topology_is_primary_thread().

You don't have to copy the code to me. I'm familiar with it.

All I need is a proper explanation why your topology_is_primary_thread()
implementation is correct under all circumstances.

Thanks,

        tglx