From: John Ogness <john.ogness@linutronix.de>
To: Petr Mladek <pmladek@suse.com>
Cc: "Sergey Senozhatsky" <senozhatsky@chromium.org>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Marcos Paulo de Souza" <mpdesouza@suse.com>,
"Samuel Thibault" <samuel.thibault@ens-lyon.org>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Jiri Slaby" <jirislaby@kernel.org>,
"Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>,
"Hugo Villeneuve" <hvilleneuve@dimonoff.com>,
"Fushuai Wang" <wangfushuai@baidu.com>,
"Kees Cook" <kees@kernel.org>,
"Stepan Ionichev" <sozdayvek@gmail.com>,
linux-serial@vger.kernel.org,
"Manuel Lauss" <manuel.lauss@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/2] braille: nbcon: Allow using a serial driver converted to nbcon API as a Braille console
Date: Fri, 25 Sep 2026 17:11:44 +0206 [thread overview]
Message-ID: <877bk9id6f.fsf@jogness.linutronix.de> (raw)
In-Reply-To: <araJ-EBntyqOGPkT@pathway.suse.cz>
On 2026-09-25, Petr Mladek <pmladek@suse.com> wrote:
>> > This shows that braille_write() is called form printk() even when
>> > braille_co is not in console_list. It is called via vt_console_print()
>> > because the graphical console driver (ttyX) is registered.
>>
>> But isn't that a bug? I thought Braille consoles were not supposed to be
>> handled by printk(). Even in this new series you added that exact
>> comment.
>
> I believe that it is not a bug. I understand it the way that the
> Braille device should show everything that is shown on the virtual
> terminal. It should show the printk() messages when they are
> printed there by the related console driver.
>
> It is just that printk() is only one source of messages shown
> on the terminal. The vt code maintains what is displayed.
But how do you register "the terminal" so that printk messages appear
there?
John
next prev parent reply other threads:[~2026-09-25 15:05 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-22 7:25 Petr Mladek
2026-09-22 7:25 ` [PATCH 1/2] printk: nbcon: Introduce Braille helpers Petr Mladek
2026-09-25 13:48 ` John Ogness
2026-09-25 14:34 ` Petr Mladek
2026-09-22 7:25 ` [PATCH 2/2] braille: nbcon: Use nbcon atomic console callbacks Petr Mladek
[not found] ` <20260922073728.2ADCD1F000FF@smtp.kernel.org>
2026-09-23 14:39 ` Petr Mladek
2026-09-25 14:34 ` John Ogness
2026-09-24 23:53 ` [PATCH 0/2] braille: nbcon: Allow using a serial driver converted to nbcon API as a Braille console Samuel Thibault
2026-09-25 13:08 ` John Ogness
2026-09-25 14:10 ` Petr Mladek
2026-09-25 14:36 ` John Ogness
2026-09-25 14:49 ` Petr Mladek
2026-09-25 15:05 ` John Ogness [this message]
2026-09-25 15:41 ` Petr Mladek
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