Re: [PATCH AUTOSEL 6.4 01/15] cpu/hotplug: Reset task stack state in _cpu_up()

[David Woodhouse]

On Sun, 2023-07-02 at 15:40 -0400, Sasha Levin wrote:
> From: David Woodhouse <dwmw@xxxxxxxxxxxx>
> 
> [ Upstream commit 6d712b9b3a58018259fb40ddd498d1f7dfa1f4ec ]
> 
> Commit dce1ca0525bf ("sched/scs: Reset task stack state in bringup_cpu()")
> ensured that the shadow call stack and KASAN poisoning were removed from
> a CPU's stack each time that CPU is brought up, not just once.
> 
> This is not incorrect.

No really, it *wasn't* incorrect. This isn't a bugfix that needs
backporting; it's preparation for the parallel CPU bringup which I
*hope* you aren't planning to backport in its entirety :)

Unless I'm missing something, I don't think you want this for stable
(in any of the trees it was just sent out for).

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