netdev - Re: [PATCH net-next 0/2] net: netconsole: convert to NBCON console infrastructure

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Message-ID: <b7b10bf1-5294-4515-8d82-31c870525ff7@redhat.com>
Date: Tue, 23 Dec 2025 08:12:08 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Breno Leitao <leitao@...ian.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 asantostc@...il.com, efault@....de, gustavold@...il.com, calvin@...nvd.org,
 jv@...sburgh.net, kernel-team@...a.com, Petr Mladek <pmladek@...e.com>,
 Simon Horman <horms@...nel.org>, Andrew Lunn <andrew+netdev@...n.ch>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next 0/2] net: netconsole: convert to NBCON console
 infrastructure

On 12/22/25 3:52 PM, Breno Leitao wrote:
> This series adds support for the nbcon (new buffer console) infrastructure
> to netconsole, enabling lock-free, priority-based console operations that
> are safer in crash scenarios.
> 
> The implementation is introduced in three steps:
> 
> 1) Refactor the message fragmentation logic into a reusable helper function
> 2) Extend nbcon support to non-extended (basic) consoles using the same
> infrastructure.
> 
> The initial discussion about it appeared a while ago in [1], in order to
> solve Mike's HARDIRQ-safe -> HARDIRQ-unsafe lock order warning, and the root
> cause is that some hosts were calling IRQ unsafe locks from inside console
> lock.
> 
> At that time, we didn't have the CON_NBCON_ATOMIC_UNSAFE yet. John
> kindly implemented CON_NBCON_ATOMIC_UNSAFE in 187de7c212e5 ("printk:
> nbcon: Allow unsafe write_atomic() for panic"), and now we can
> implement netconsole on top of nbcon.
> 
> Important to note that netconsole continues to call netpoll and the
> network TX helpers with interrupt disable, given the TX are called with
> target_list_lock.
> 
> Link:
> https://lore.kernel.org/all/b2qps3uywhmjaym4mht2wpxul4yqtuuayeoq4iv4k3zf5wdgh3@tocu6c7mj4lt/
> [1]
> 
> Signed-off-by: Breno Leitao <leitao@...ian.org>

## Form letter - net-next-closed

The net-next tree is closed for new drivers, features, code refactoring
and optimizations due to the merge window and the winter break. We are
currently accepting bug fixes only.

Please repost when net-next reopens after Jan 2nd.

RFC patches sent for review only are obviously welcome at any time.
---
To save me a few moments, I will not send the same messages in reply to
the others pending  net-next patches of yours, but this still applies :-P