linux-kernel - Re: [PATCH v4 1/2] arm64: topology: move store_cpu

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Message-ID: <198b0486-29e7-9729-d137-0470e93038fa@microchip.com>
Date:   Tue, 19 Jul 2022 11:51:04 +0000
From:   <Conor.Dooley@...rochip.com>
To:     <catalin.marinas@....com>
CC:     <paul.walmsley@...ive.com>, <palmer@...belt.com>,
        <palmer@...osinc.com>, <aou@...s.berkeley.edu>,
        <sudeep.holla@....com>, <will@...nel.org>,
        <gregkh@...uxfoundation.org>, <rafael@...nel.org>,
        <Daire.McNamara@...rochip.com>, <Conor.Dooley@...rochip.com>,
        <niklas.cassel@....com>, <damien.lemoal@...nsource.wdc.com>,
        <geert@...ux-m68k.org>, <zong.li@...ive.com>, <kernel@...il.dk>,
        <hahnjo@...njo.de>, <guoren@...nel.org>, <anup@...infault.org>,
        <atishp@...shpatra.org>, <heiko@...ech.de>,
        <philipp.tomsich@...ll.eu>, <robh@...nel.org>, <maz@...nel.org>,
        <viresh.kumar@...aro.org>, <linux-riscv@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <Brice.Goglin@...ia.fr>
Subject: Re: [PATCH v4 1/2] arm64: topology: move store_cpu_topology() to
 shared code

On 19/07/2022 12:41, Catalin Marinas wrote:
> On Fri, Jul 15, 2022 at 06:51:55PM +0100, Conor Dooley wrote:
>> From: Conor Dooley <conor.dooley@...rochip.com>
>>
>> arm64's method of defining a default cpu topology requires only minimal
>> changes to apply to RISC-V also. The current arm64 implementation exits
>> early in a uniprocessor configuration by reading MPIDR & claiming that
>> uniprocessor can rely on the default values.
>>
>> This is appears to be a hangover from prior to '3102bc0e6ac7 ("arm64:
>> topology: Stop using MPIDR for topology information")', because the
>> current code just assigns default values for multiprocessor systems.
>>
>> With the MPIDR references removed, store_cpu_topolgy() can be moved to
>> the common arch_topology code.
>>
>> CC: stable@...r.kernel.org
> 
> I'd quantify how far back you want this to go. IIUC based on the Fixes
> tag in the other patch, it should stop at 5.4. If you send a pull
> request instead and have a fixed commit id, you could add it as a
> prerequisite on the following patch without a cc stable here.

I guess a PR might be the easiest way for it anyway, so that both
yourself and Palmer could merge it?

> 
> Either way:
> 
> Acked-by: Catalin Marinas <catalin.marinas@....com>

Thanks.