linux-kernel - Re: [PATCH v4] xen: avoid crash in disable_hotplug

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Message-ID: <972dd70f-3fab-c8f4-0c9a-3916931c8ca8@oracle.com>
Date:   Mon, 10 Sep 2018 13:55:25 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Olaf Hering <olaf@...fle.de>
Cc:     xen-devel@...ts.xenproject.org, Juergen Gross <jgross@...e.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] xen: avoid crash in disable_hotplug_cpu

On 09/10/2018 11:58 AM, Olaf Hering wrote:
> Am Fri, 7 Sep 2018 12:56:37 -0400
> schrieb Boris Ostrovsky <boris.ostrovsky@...cle.com>:
>
>> I was hoping you'd respond to my question about warning.
>>
>> root@...well> xl vcpu-set 3 0  
>> and in the guest
>>
>> [root@...0238 ~]# [   32.866955] ------------[ cut here ]------------
>> [   32.866963] spinlock on CPU0 exists on IRQ1!
>> [   32.866984] WARNING: CPU: 0 PID: 14 at arch/x86/xen/spinlock.c:90
>> xen_init_lock_cpu+0xbf/0xd0
> This happens to work for me, on X5550. Please send your .config.
>


Attached. I suspect it may be CONFIG_PARAVIRT_SPINLOCKS.

-boris

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