netdev - Re: pegged softirq and NAPI race (?)

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Message-ID: <CANn89iLzFhXS77T=Hu6SSrL5NR+VqvDwX3AXDxhSy15aCUEWMw@mail.gmail.com>
Date:   Tue, 18 Sep 2018 14:28:36 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     songliubraving@...com, Alexei Starovoitov <ast@...com>,
        netdev <netdev@...r.kernel.org>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Alexander Duyck <alexander.h.duyck@...el.com>,
        michael.chan@...adcom.com, kernel-team <Kernel-team@...com>
Subject: Re: pegged softirq and NAPI race (?)

On Tue, Sep 18, 2018 at 2:25 PM Florian Fainelli <f.fainelli@...il.com> wrote:
>
>
> This would not be the only driver doing this unfortunately... should we
> add a __must_check annotation to help catch those (mis)uses? Though that
> could cause false positives for drivers using NAPI to clean their TX ring.
>

Well, before adding __must_check we would need to cook a (big) patch
series to change all occurrences.


Not clear why netpoll is the trigger ?