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

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