linux-kernel - Re: [PATCH 0/7] xen/events: bug fixes and some diagnostic aids

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Message-ID: <9f07dae5-050c-da2c-edc1-e1587dbae9c4@xen.org>
Date:   Mon, 8 Feb 2021 14:35:14 +0000
From:   Julien Grall <julien@....org>
To:     Jürgen Groß <jgross@...e.com>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, netdev@...r.kernel.org,
        linux-scsi@...r.kernel.org
Cc:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        stable@...r.kernel.org,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Roger Pau Monné <roger.pau@...rix.com>,
        Jens Axboe <axboe@...nel.dk>, Wei Liu <wei.liu@...nel.org>,
        Paul Durrant <paul@....org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH 0/7] xen/events: bug fixes and some diagnostic aids



On 08/02/2021 14:20, Julien Grall wrote:
>>>> I believe this will be the case before our "lateeoi" handling is
>>>> becoming active (more precise: when our IRQ handler is returning to
>>>> handle_fasteoi_irq()), resulting in the possibility of the same race we
>>>> are experiencing now.
>>>
>>> I am a bit confused what you mean by "lateeoi" handling is becoming 
>>> active. Can you clarify?
>>
>> See above: the next call of the handler should be allowed only after
>> xen_irq_lateeoi() for the IRQ has been called.
>>
>> If the handler is being called earlier we have the race resulting
>> in the WARN() splats.
> 
> I feel it is dislike to understand race with just words. Can you provide

Sorry I meant difficult rather than dislike.

Cheers,

-- 
Julien Grall