linux-kernel - Re: [PATCH] xen/x86: fix cpu hotplug

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Message-ID: <2b982ef6-aefd-7e52-80c1-3bd87e10a78d@oracle.com>
Date:   Tue, 18 Jul 2017 11:05:18 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org, x86@...nel.org
Cc:     hpa@...or.com, tglx@...utronix.de, mingo@...hat.com,
        stable@...r.kernel.org
Subject: Re: [PATCH] xen/x86: fix cpu hotplug

On 07/05/2017 10:05 AM, Juergen Gross wrote:
> Commit dc6416f1d711eb4c1726e845d653235dcaae12e1 ("xen/x86: Call
> cpu_startup_entry(CPUHP_AP_ONLINE_IDLE) from xen_play_dead()")
> introduced an error leading to a stack overflow of the idle task when
> a cpu was brought offline/online many times: by calling
> cpu_startup_entry() instead of returning at the end of xen_play_dead()
> do_idle() would be entered again and again.
>
> Don't use cpu_startup_entry(), but cpuhp_online_idle() instead allowing
> to return from xen_play_dead().
>
> Cc: <stable@...r.kernel.org> # 4.12
> Signed-off-by: Juergen Gross <jgross@...e.com>


Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>