From: Mike Galbraith <efault@gmx.de>
To: Vladimir Oltean <olteanv@gmail.com>,
Heiner Kallweit <hkallweit1@gmail.com>
Cc: netdev <netdev@vger.kernel.org>,
Realtek linux nic maintainers <nic_swsd@realtek.com>
Subject: Re: [patchlet] r8169: fix napi_schedule_irqoff() called with irqs enabled warning
Date: Fri, 16 Oct 2020 19:11:22 +0200 [thread overview]
Message-ID: <42ff951039f3c92def8490d3842e3f7eaf6900ff.camel@gmx.de> (raw)
In-Reply-To: <20201016142611.zpp63qppmazxl4k7@skbuf>
On Fri, 2020-10-16 at 17:26 +0300, Vladimir Oltean wrote:
> On Fri, Oct 16, 2020 at 01:34:55PM +0200, Heiner Kallweit wrote:
> > I'm aware of the topic, but missing the benefits of the irqoff version
> > unconditionally doesn't seem to be the best option.
>
> What are the benefits of the irqoff version? As far as I see it, the
> only use case for that function is when the caller has _explicitly_
> disabled interrupts.
Yeah, it's a straight up correctness issue as it sits. There is a
dinky bit of overhead added to the general case when using the correct
function though, at least on x86. I personally don't see why we should
care deeply enough to want to add more code to avoid it given there are
about a zillions places where we do the same for the same reason, but
that's a maintainer call.
-Mike
next prev parent reply other threads:[~2020-10-16 17:11 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-16 11:26 [patchlet] r8169: fix napi_schedule_irqoff() called with irqs enabled warning Mike Galbraith
2020-10-16 11:34 ` Heiner Kallweit
2020-10-16 11:57 ` Mike Galbraith
2020-10-16 14:26 ` Vladimir Oltean
2020-10-16 14:41 ` Heiner Kallweit
2020-10-16 15:40 ` Vladimir Oltean
2020-10-16 17:11 ` Mike Galbraith [this message]
2020-10-16 17:19 ` Vladimir Oltean
2020-10-16 19:15 ` Heiner Kallweit
2020-10-17 2:26 ` Mike Galbraith
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