Re: [PATCH 00/19] printk cleanup - part 3

Marcos Paulo de Souza
2026-02-20T11:44:08Z

On Sat, 2025-12-27 at 09:16 -0300, Marcos Paulo de Souza wrote:
> 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@suse.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(-)

This patchset, without the recent cleanup from Petr Mladek [1], has a
regression. I'll wait for it to be merged first before sending a new
version of this patchset. Thanks for all the reviews!

[1]:
https://lore.kernel.org/lkml/20260206165002.496724-1-pmladek@suse.com/

> ---
> base-commit: 93d65587479cfc97c0d7e41b5e8c6378ca681632
> change-id: 20251202-printk-cleanup-part3-ea116b11b3a6
>
> Best regards,
> --
> Marcos Paulo de Souza <mpdesouza@suse.com>