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: 10+ 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
2026-06-11 18:36 ` sashiko-bot
2026-06-12 2:11 ` Jakub Kicinski
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
2026-06-16 21:17 ` Jakub Kicinski
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