[GIT PULL] printk for 7.3-rc3

[GIT PULL] printk for 7.3-rc3

[Petr Mladek]

Hi Linus,

please pull one fix from

  git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux.git tags/printk-for-7.3-rc7

================================================================

- Allow using Braille console with a serial console driver converted
  to NBCON API.

================================================================

Note that Braille console is not a classic printk console. It uses
the printk code for registration and the printk callbacks for emitting
messages. But it is not added into console_list. Instead, it is wired
into the VT code and shows the content displayed on the terminal.

The current solution is a kind of hack. John has started working
on converting the Braille console driver to use the serdev API
so that we do not have to deal with NBCON API in the VT context
which is historically under console_lock...

We would like to get this temporary solution into 7.3 so that
the Braille console does not stop working with the newly converted
uart 8250 serial console driver.

----------------------------------------------------------------
Petr Mladek (1):
      braille: nbcon: Allow to use a serial console with NBCON API as Braille console

 drivers/accessibility/braille/braille_console.c | 57 +++++++++++++++++-
 drivers/tty/serial/8250/8250_port.c             |  5 +-
 drivers/tty/serial/amba-pl011.c                 |  2 +-
 drivers/tty/serial/imx.c                        |  2 +-
 drivers/tty/serial/sifive.c                     |  2 +-
 include/linux/console.h                         | 15 +++++
 kernel/printk/nbcon.c                           | 79 +++++++++++++++++++++++++
 7 files changed, 156 insertions(+), 6 deletions(-)

Re: [GIT PULL] printk for 7.3-rc3

[Petr Mladek]

Hi,

it is obviously for 7.3-rc7 ;-)

Best Regards,
Petr

On Tue 2026-10-06 08:57:44, Petr Mladek wrote:
> Hi Linus,
> 
> please pull one fix from
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux.git tags/printk-for-7.3-rc7
> 
> ================================================================
> 
> - Allow using Braille console with a serial console driver converted
>   to NBCON API.
> 
> ================================================================
> 
> Note that Braille console is not a classic printk console. It uses
> the printk code for registration and the printk callbacks for emitting
> messages. But it is not added into console_list. Instead, it is wired
> into the VT code and shows the content displayed on the terminal.
> 
> The current solution is a kind of hack. John has started working
> on converting the Braille console driver to use the serdev API
> so that we do not have to deal with NBCON API in the VT context
> which is historically under console_lock...
> 
> We would like to get this temporary solution into 7.3 so that
> the Braille console does not stop working with the newly converted
> uart 8250 serial console driver.
> 
> ----------------------------------------------------------------
> Petr Mladek (1):
>       braille: nbcon: Allow to use a serial console with NBCON API as Braille console
> 
>  drivers/accessibility/braille/braille_console.c | 57 +++++++++++++++++-
>  drivers/tty/serial/8250/8250_port.c             |  5 +-
>  drivers/tty/serial/amba-pl011.c                 |  2 +-
>  drivers/tty/serial/imx.c                        |  2 +-
>  drivers/tty/serial/sifive.c                     |  2 +-
>  include/linux/console.h                         | 15 +++++
>  kernel/printk/nbcon.c                           | 79 +++++++++++++++++++++++++
>  7 files changed, 156 insertions(+), 6 deletions(-)

Re: [GIT PULL] printk for 7.3-rc3

[pr-tracker-bot]

The pull request you sent on Tue, 6 Oct 2026 08:57:42 +0200:

> git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux.git tags/printk-for-7.3-rc7

has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/22430ae5d90ab288b0ee2ad99ae941f4a666b694

Thank you!

-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/prtracker.html

[GIT PULL] printk for 7.3-rc3

[Petr Mladek]

Hi Linus,

please pull some printk fixes from

  git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux.git tags/printk-for-7.3-rc3

=======================================

- Use lazy irq_work for waking printk kthreads.

- Flush pending irq_work before destroying printk kthreads.

- Remove redundant WARN() when a printk kthread can't be created.

- Typo fix.

----------------------------------------------------------------

The primary motivation for making the irq_work lazy is that pending
IRQs block suspending and entering idle states on Tegra20 and Tegra30
platforms. They even did not boot after converting uart 8250 console
driver to the nbcon API.

It should be acceptable because printk kthreads are used for
non-emergency messages. They have to wait until they get
scheduled anyway.

This seems to be the least hacky solution which might even have
some positive effect in reducing the IRQ noise. And it allows
to keep the converted uart 8250 console driver in 7.3.

The discussion about the Tegra problems can be found at
https://lore.kernel.org/lkml/f3757a75-0ba1-4558-bf57-f19ab7e59a4c@nvidia.com/
https://lore.kernel.org/all/20260828155811.270462-1-john.ogness@linutronix.de/

----------------------------------------------------------------

Johan Hovold (1):
      console: fix /dev/kmsg reference in flags kernel doc

John Ogness (2):
      printk/nbcon: Flush nbcon_irq_work in nbcon_free()
      printk/nbcon: Change nbcon_irq_work to IRQ_WORK_LAZY

Petr Mladek (1):
      Merge branch 'for-7.4-trivial' into for-linus

Tetsuo Handa (1):
      printk: Don't WARN on kthread_run failure.

 include/linux/console.h | 2 +-
 kernel/printk/nbcon.c   | 6 ++++--
 kernel/printk/printk.c  | 2 +-
 3 files changed, 6 insertions(+), 4 deletions(-)

Re: [GIT PULL] printk for 7.3-rc3

[pr-tracker-bot]

The pull request you sent on Wed, 9 Sep 2026 11:08:43 +0200:

> git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux.git tags/printk-for-7.3-rc3

has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/3f8b8c94a723ab6c0a62005e69a0872717f01709

Thank you!

-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/prtracker.html