Message-Id: <20251227-printk-cleanup-part3-v1-0-21a291bcf197@suse.com>
Date: Sat, 27 Dec 2025 09:16:07 -0300
From: Marcos Paulo de Souza <mpdesouza@...e.com>
To: Richard Weinberger <richard@....at>, 
 Anton Ivanov <anton.ivanov@...bridgegreys.com>, 
 Johannes Berg <johannes@...solutions.net>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Jason Wessel <jason.wessel@...driver.com>, 
 Daniel Thompson <danielt@...nel.org>, 
 Douglas Anderson <dianders@...omium.org>, Petr Mladek <pmladek@...e.com>, 
 Steven Rostedt <rostedt@...dmis.org>, 
 John Ogness <john.ogness@...utronix.de>, 
 Sergey Senozhatsky <senozhatsky@...omium.org>, 
 Jiri Slaby <jirislaby@...nel.org>, Breno Leitao <leitao@...ian.org>, 
 Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Geert Uytterhoeven <geert@...ux-m68k.org>, Kees Cook <kees@...nel.org>, 
 Tony Luck <tony.luck@...el.com>, 
 "Guilherme G. Piccoli" <gpiccoli@...lia.com>, 
 Madhavan Srinivasan <maddy@...ux.ibm.com>, 
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, 
 Christophe Leroy <christophe.leroy@...roup.eu>, 
 Andreas Larsson <andreas@...sler.com>, 
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
 Maxime Coquelin <mcoquelin.stm32@...il.com>, 
 Alexandre Torgue <alexandre.torgue@...s.st.com>, 
 Jacky Huang <ychuang3@...oton.com>, Shan-Chun Hung <schung@...oton.com>, 
 Laurentiu Tudor <laurentiu.tudor@....com>
Cc: linux-um@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 kgdb-bugreport@...ts.sourceforge.net, linux-serial@...r.kernel.org, 
 netdev@...r.kernel.org, linux-m68k@...ts.linux-m68k.org, 
 linux-hardening@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, 
 sparclinux@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com, 
 linux-arm-kernel@...ts.infradead.org, linux-fsdevel@...r.kernel.org, 
 Marcos Paulo de Souza <mpdesouza@...e.com>
Subject: [PATCH 00/19] printk cleanup - part 3

The parts 1 and 2 can be found here [1] and here[2].

The changes proposed in this part 3 are mostly to clarify the usage of
the interfaces for NBCON, and use the printk helpers more broadly.
Besides it, it also introduces a new way to register consoles
and drop thes the CON_ENABLED flag. It seems too much, but in reality
the changes are not complex, and as the title says, it's basically a
cleanup without changing the functional changes.

This patchset includes a patch from part 2 that needed more work [3], as
suggested by Petr Mladek.

These changes were tested by reverting f79b163c4231
("Revert "serial: 8250: Switch to nbcon console""), and used qemu to test
suspend/resume cycles, and everything worked as expected.

PS: b4 --auto-to-cc added a bunch of people as CC, so I'm not sure if
I should remove some or not, so I'm leaving the list as it is. If the
patchset needs a v2, and you feel that you don't need to copied, just
let me know.

Thanks for checking the patches, and happy holidays!

[1]: https://lore.kernel.org/lkml/20250226-printk-renaming-v1-0-0b878577f2e6@suse.com/#t
[2]: https://lore.kernel.org/linux-serial/20251121-printk-cleanup-part2-v2-0-57b8b78647f4@suse.com/
[3]: https://lore.kernel.org/linux-serial/aSgeqM3DWvR8-cMY@pathway.suse.cz/

Signed-off-by: Marcos Paulo de Souza <mpdesouza@...e.com>
---
Marcos Paulo de Souza (19):
      printk/nbcon: Use an enum to specify the required callback in console_is_usable()
      printk: Introduce console_is_nbcon
      printk: Drop flags argument from console_is_usable
      printk: Reintroduce consoles_suspended global state
      printk: Add more context to suspend/resume functions
      printk: Introduce register_console_force
      drivers: netconsole: Migrate to register_console_force helper
      debug: debug_core: Migrate to register_console_force helper
      m68k: emu: nfcon.c: Migrate to register_console_force helper
      fs: pstore: platform: Migrate to register_console_force helper
      powerpc: kernel: udbg: Migrate to register_console_force helper
      sparc: kernel: btext: Migrate to register_console_force helper
      um: drivers: mconsole_kern.c: Migrate to register_console_force helper
      drivers: hwtracing: stm: console.c: Migrate to register_console_force helper
      drivers: tty: serial: mux.c: Migrate to register_console_force helper
      drivers: tty: serial: ma35d1_serial: Migrate to register_console_force helper
      drivers: tty: ehv_bytechan: Migrate to register_console_force helper
      drivers: braille: console: Drop CON_ENABLED console flag
      printk: Remove CON_ENABLED flag

 arch/m68k/emu/nfcon.c                           |   5 +-
 arch/powerpc/kernel/udbg.c                      |   4 +-
 arch/sparc/kernel/btext.c                       |   4 +-
 arch/um/drivers/mconsole_kern.c                 |   3 +-
 arch/um/kernel/kmsg_dump.c                      |   2 +-
 drivers/accessibility/braille/braille_console.c |   1 -
 drivers/hwtracing/stm/console.c                 |   4 +-
 drivers/net/netconsole.c                        |  13 +--
 drivers/tty/ehv_bytechan.c                      |   4 +-
 drivers/tty/serial/ma35d1_serial.c              |   4 +-
 drivers/tty/serial/mux.c                        |   4 +-
 drivers/tty/tty_io.c                            |   6 +-
 fs/proc/consoles.c                              |   1 -
 fs/pstore/platform.c                            |   6 +-
 include/linux/console.h                         | 143 +++++++++++++++++++-----
 kernel/debug/debug_core.c                       |   6 +-
 kernel/debug/kdb/kdb_io.c                       |   6 +-
 kernel/printk/nbcon.c                           |  17 +--
 kernel/printk/printk.c                          | 140 ++++++++++++-----------
 19 files changed, 230 insertions(+), 143 deletions(-)
---
base-commit: 93d65587479cfc97c0d7e41b5e8c6378ca681632
change-id: 20251202-printk-cleanup-part3-ea116b11b3a6

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

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