linux-kernel - Re: [PATCH] cpu/hotplug: check the return value of idle_thread

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Date:   Wed, 18 May 2022 10:55:37 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Chao Liu <liuchao173@...wei.com>, linux-kernel@...r.kernel.org,
        hewenliang4@...wei.com
Cc:     steven.price@....com, Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] cpu/hotplug: check the return value of idle_thread_get

On Mon, Mar 27 2023 at 20:37, Chao Liu wrote:
> ilde may be ERR_PTR()

Yes, but if that happens in bringup_cpu() or finish_cpu() it would be a
serious bug and the error pointer dereference would be the least of the
problems.

If the initial check in _cpu_up() failed for a CPU then the above
functions cannot be invoked for that CPU ever.

Thanks,

        tglx