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

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Message-ID: <20230419100214.x6y6jgpvnupmgplr@bogus>
Date:   Wed, 19 Apr 2023 11:02:14 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc:     catalin.marinas@....com, will@...nel.org, peterz@...radead.org,
        jpoimboe@...nel.org, rafael.j.wysocki@...el.com,
        vschneid@...hat.com, ben-linux@...ff.org, Pierre.Gondois@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Peng Fan <peng.fan@....com>
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 ?

--
Regards,
Sudeep

[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2013-June/174324.html
[2] https://yhbt.net/lore/all/1524697712-20208-1-git-send-email-rokhanna@nvidia.com/