Re: [PATCH printk 00/18] preparation for threaded/atomic printing

From: Petr Mladek <pmladek@suse.com>
To: John Ogness <john.ogness@linutronix.de>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jiri Slaby <jirislaby@kernel.org>,
	"James E.J. Bottomley" <James.Bottomley@hansenpartnership.com>,
	Helge Deller <deller@gmx.de>,
	Sven Schnelle <svens@stackframe.org>,
	John David Anglin <dave.anglin@bell.net>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Julia Lawall <Julia.Lawall@inria.fr>,
	linux-parisc@vger.kernel.org,
	Jason Wessel <jason.wessel@windriver.com>,
	Daniel Thompson <daniel.thompson@linaro.org>,
	Douglas Anderson <dianders@chromium.org>,
	kgdb-bugreport@lists.sourceforge.net,
	linux-serial@vger.kernel.org, Aaron Tomlin <atomlin@redhat.com>,
	Luis Chamberlain <mcgrof@kernel.org>
Subject: Re: [PATCH printk 00/18] preparation for threaded/atomic printing
Date: Thu, 29 Sep 2022 18:33:35 +0200	[thread overview]
Message-ID: <YzXI3ztt3kpMbFt1@alley> (raw)
In-Reply-To: <20220924000454.3319186-1-john.ogness@linutronix.de>

On Sat 2022-09-24 02:10:36, John Ogness wrote:
> Hi,
> 
> This series is essentially the first 18 patches of tglx's RFC series
> [0] with only minor changes in comments and commit messages. It's
> purpose is to lay the groundwork for the upcoming threaded/atomic
> console printing posted as the RFC series and demonstrated at
> LPC2022 [1].
> 
> This series is interesting for mainline because it cleans up various
> code and documentation quirks discovered while working on the new
> console printing implementation.
> 
> Aside from cleanups, the main features introduced here are:
> 
> - Converts the console's DIY linked list implementation to hlist.
> 
> - Introduces a console list lock (mutex) so that readers (such as
>   /proc/consoles) can safely iterate the consoles without blocking
>   console printing.
> 
> - Adds SRCU support to the console list to prepare for safe console
>   list iterating from any context.
> 
> - Refactors buffer handling to prepare for per-console, per-cpu,
>   per-context atomic printing.
> 
> The series has the following parts:
> 
>    Patches  1 - 5:   Cleanups
> 
>    Patches  6 - 12:  Locking and list conversion
> 
>    Patches 13 - 18:  Improved output buffer handling to prepare for
>                      code sharing
> 
> Thomas Gleixner (18):
>   printk: Make pr_flush() static
>   printk: Declare log_wait properly
>   printk: Remove write only variable nr_ext_console_drivers
>   printk: Remove bogus comment vs. boot consoles
>   printk: Mark __printk percpu data ready __ro_after_init

JFYI, I have pushed the first 5 cleanup patches into printk/linux.git,
branch rework/kthreads. The aim is to get them into 6.1.

The rest of the patchset is still being discussed.

Best Regards,
Petr