linux-kernel - [PATCH 0/2] Handle NBCON consoles on KDB

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Message-Id: <20250713-nbcon-kgdboc-v1-0-51eccd9247a8@suse.com>
Date: Sun, 13 Jul 2025 02:09:17 -0300
From: Marcos Paulo de Souza <mpdesouza@...e.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Petr Mladek <pmladek@...e.com>, Steven Rostedt <rostedt@...dmis.org>, 
 John Ogness <john.ogness@...utronix.de>, 
 Sergey Senozhatsky <senozhatsky@...omium.org>, 
 Jason Wessel <jason.wessel@...driver.com>, 
 Daniel Thompson <danielt@...nel.org>, 
 Douglas Anderson <dianders@...omium.org>
Cc: linux-kernel@...r.kernel.org, kgdb-bugreport@...ts.sourceforge.net, 
 Marcos Paulo de Souza <mpdesouza@...e.com>
Subject: [PATCH 0/2] Handle NBCON consoles on KDB

After the proposed patches [1], it was suggested to start using
console_is_usable instead of checking if that console is enabled. It was
noticies that KDB was always calling con->write method, but this
callback is not usable for NBCON consoles.

As a first step into making console_is_usable public, I prepared these
two patches that makes public some nbcon functions, and also fixes the
KDB to also handle NBCON consoles.

Thanks to all reviewers of the patches posted on [1]! I hope this is the
first step into implementing all the changes suggested in that patchset.

[1]: https://lore.kernel.org/lkml/20250606-printk-cleanup-part2-v1-0-f427c743dda0@suse.com/

Signed-off-by: Marcos Paulo de Souza <mpdesouza@...e.com>
---
Marcos Paulo de Souza (2):
      printk: nbcon: Export console_is_usage and other nbcon symbols
      kdb: Adapt kdb_msg_write to work with NBCON consoles

 include/linux/console.h   | 48 +++++++++++++++++++++++++++++++++++++++++++++++
 kernel/debug/kdb/kdb_io.c | 46 +++++++++++++++++++++++++++++++++++++++++----
 kernel/printk/internal.h  | 41 ----------------------------------------
 kernel/printk/nbcon.c     |  4 ++--
 4 files changed, 92 insertions(+), 47 deletions(-)
---
base-commit: d0b3b7b22dfa1f4b515fd3a295b3fd958f9e81af
change-id: 20250713-nbcon-kgdboc-efcfc37fde46

Best regards,
-- 
Marcos Paulo de Souza <mpdesouza@...e.com>