From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: Juergen Gross <jgross@suse.com>,
linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org,
x86@kernel.org
Cc: hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com,
stable@vger.kernel.org
Subject: Re: [PATCH] xen/x86: fix cpu hotplug
Date: Tue, 18 Jul 2017 11:05:18 -0400 [thread overview]
Message-ID: <2b982ef6-aefd-7e52-80c1-3bd87e10a78d@oracle.com> (raw)
In-Reply-To: <20170705140520.4948-1-jgross@suse.com>
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@vger.kernel.org> # 4.12
> Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
prev parent reply other threads:[~2017-07-18 15:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-05 14:05 [PATCH] xen/x86: fix cpu hotplug Juergen Gross
2017-07-18 15:05 ` Boris Ostrovsky [this message]
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