linux-kernel - RE: [PATCH] arm64: kernel: smp: ignore disabled cpu node

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Date:   Wed, 19 Apr 2023 11:22:09 +0000
From:   Peng Fan <peng.fan@....com>
To:     Sudeep Holla <sudeep.holla@....com>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>
CC:     "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "jpoimboe@...nel.org" <jpoimboe@...nel.org>,
        "rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
        "vschneid@...hat.com" <vschneid@...hat.com>,
        "ben-linux@...ff.org" <ben-linux@...ff.org>,
        "Pierre.Gondois@....com" <Pierre.Gondois@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] arm64: kernel: smp: ignore disabled cpu node

> Subject: Re: [PATCH] arm64: kernel: smp: ignore disabled cpu node
>
> On Wed, Apr 19, 2023 at 05:40:39PM +0800, Peng Fan (OSS) wrote:
> > From: Peng Fan <peng.fan@....com>
> >
> > If the cpu node is set disabled in device tree, we should ignore the
> > node. i.MX8MP has some variants, which have one or two or four A53
> cores.
> > The current imx8mp device tree use the full feature SoC. With such
> > device tree to bring the variant with one or two A53 cores will cause
> > issue.
> >
> > The firmware will update the status property, and kernel will check
> > the property before bring up the core.
> >
>
> IIRC it has been discussed in the past[1][2], has anything changed now ?

Ok, removing cpu nodes also means we need also runtime update
cooling devices node, and etc.

Thanks,
Peng.
>
> --
> Regards,
> Sudeep
>
> [1]
> http://lists.in/
> fradead.org%2Fpipermail%2Flinux-arm-kernel%2F2013-
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> 0%7C0%7C638174953417504770%7CUnknown%7CTWFpbGZsb3d8eyJWIjoi
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> 00%7C%7C%7C&sdata=4wUcFCMArXHGL%2BGu4gAkRFzrqITYvWfe2uyw9Wj
> n00w%3D&reserved=0
> [2]
> https://yhbt/.
> net%2Flore%2Fall%2F1524697712-20208-1-git-send-email-
> rokhanna%40nvidia.com%2F&data=05%7C01%7Cpeng.fan%40nxp.com%7Cf
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> 35%7C0%7C0%7C638174953417504770%7CUnknown%7CTWFpbGZsb3d8ey
> JWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D
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