From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Jakub Kicinski <kuba@kernel.org>
Cc: Petr Mladek <pmladek@suse.com>,
John Ogness <john.ogness@linutronix.de>,
Sergey Senozhatsky <senozhatsky@chromium.org>,
Peter Zijlstra <peterz@infradead.org>,
Vlad Poenaru <vlad.wing@gmail.com>,
Thomas Gleixner <tglx@kernel.org>,
netdev@vger.kernel.org, "David S . Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>,
Breno Leitao <leitao@debian.org>,
Clark Williams <clrkwllms@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
linux-rt-devel@lists.linux.dev, linux-kernel@vger.kernel.org,
stable@vger.kernel.org, Frederic Weisbecker <frederic@kernel.org>,
Ingo Molnar <mingo@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
K Prateek Nayak <kprateek.nayak@amd.com>
Subject: Re: [PATCH net] netpoll: run NAPI poll in softirq context to avoid rq->lock self-deadlock
Date: Tue, 16 Jun 2026 17:31:22 +0200 [thread overview]
Message-ID: <20260616153122.keHMKvVT@linutronix.de> (raw)
In-Reply-To: <20260616081128.04e2c8dd@kernel.org>
On 2026-06-16 08:11:28 [-0700], Jakub Kicinski wrote:
> >
> > Adding sched and printk folks for opinions while eyeballing
> > WARN_ON_DEFERRED().
>
> Thanks a lot for looking into this! To be clear - the printk_deferred /
> WARN_DEFERRED would be just for stable? Or there's still some
> sensitivity even with nbcon?
We already have printk_deferred(). WARN_DEFERRED() would be new. I
*think* this is not limited netpoll/ netconsole but all console drivers
not using CON_NBCON if the printk (via WARN) occurs with the rq held.
I don't remember all the details but printk_deferred() was introduced to
circumvent this until printk is fixed.
Once we get rid of those legacy drivers and NBCON is the default we can
get rid of printk_deferred() :)
Sebastian
next prev parent reply other threads:[~2026-06-16 15:31 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-10 18:36 [PATCH net] netpoll: run NAPI poll in softirq context to avoid rq->lock self-deadlock Vlad Poenaru
[not found] ` <20260611191114.5bc43a59@kernel.org>
2026-06-15 13:56 ` Sebastian Andrzej Siewior
2026-06-16 10:35 ` Sebastian Andrzej Siewior
2026-06-16 15:11 ` Jakub Kicinski
2026-06-16 15:31 ` Sebastian Andrzej Siewior [this message]
2026-06-16 16:32 ` Breno Leitao
2026-06-16 17:02 ` Peter Zijlstra
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260616153122.keHMKvVT@linutronix.de \
--to=bigeasy@linutronix.de \
--cc=clrkwllms@kernel.org \
--cc=davem@davemloft.net \
--cc=dietmar.eggemann@arm.com \
--cc=edumazet@google.com \
--cc=frederic@kernel.org \
--cc=horms@kernel.org \
--cc=john.ogness@linutronix.de \
--cc=kprateek.nayak@amd.com \
--cc=kuba@kernel.org \
--cc=leitao@debian.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rt-devel@lists.linux.dev \
--cc=mingo@redhat.com \
--cc=netdev@vger.kernel.org \
--cc=pabeni@redhat.com \
--cc=peterz@infradead.org \
--cc=pmladek@suse.com \
--cc=rostedt@goodmis.org \
--cc=senozhatsky@chromium.org \
--cc=stable@vger.kernel.org \
--cc=tglx@kernel.org \
--cc=vincent.guittot@linaro.org \
--cc=vlad.wing@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox