linux-kernel - Re: [PATCH] xen/events: reset active flag for lateeoi events later

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Date:   Mon, 5 Jul 2021 11:16:43 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Ross Lagerwall <ross.lagerwall@...rix.com>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Cc:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Julien Grall <julien@....org>
Subject: Re: [PATCH] xen/events: reset active flag for lateeoi events later

On 05.07.21 11:00, Ross Lagerwall wrote:
> On 2021-06-23 14:09, Juergen Gross wrote:
>> In order to avoid a race condition for user events when changing
>> cpu affinity reset the active flag only when EOI-ing the event.
>>
>> This is working fine as all user events are lateeoi events. Note that
>> lateeoi_ack_mask_dynirq() is not modified as there is no explicit call
>> to xen_irq_lateeoi() expected later.
>>
>> Reported-by: Julien Grall <julien@....org>
>> Fixes: b6622798bc50b62 ("xen/events: avoid handling the same event on two cpus at the same time")
>> Tested-by: Julien Grall <julien@....org>
>> Signed-off-by: Juergen Gross <jgross@...e.com>
>> ---
> 
> Hi Juergen,
> 
> Are you planning on backporting this fix to releases <= 5.10?

It is on my todo list. :-)


Juergen

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