linux-kernel - [GIT PULL] printk for 5.11

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Date:   Mon, 14 Dec 2020 16:18:32 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org,
        Daniel Thompson <daniel.thompson@...aro.org>
Subject: [GIT PULL] printk for 5.11

Linus,

please pull the latest printk changes from

  git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux.git tags/printk-for-5.11

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

- Finally allow parallel writes and reads into/from the lockless
  ringbuffer. But it is not a complete solution. Readers are still
  serialized against each other. And nested writes are still
  prevented by printk_safe per-CPU buffers.

- Use ttynull as the ultimate fallback for /dev/console.

- Officially allow to disable console output by using console="" or
  console=null

- Few code cleanups.

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

We believe that the risk of logbuf_lock removal is small.
It is another important step in the printk rework. We are
moving slowly and carefully.

----------------------------------------------------------------
John Ogness (2):
      printk: inline log_output(),log_store() in vprintk_store()
      printk: remove logbuf_lock writer-protection of ringbuffer

Lukas Bulwahn (1):
      printk: remove obsolete dead assignment

Nikolay Borisov (1):
      printk: ringbuffer: Reference text_data_ring directly in callees.

Petr Mladek (4):
      init/console: Use ttynull as a fallback when there is no console
      printk/console: Allow to disable console output by using console="" or console=null
      Merge branch 'for-5.11-null-console' into for-linus
      Merge branch 'for-5.11' into for-linus

 drivers/tty/Kconfig               |  14 ---
 drivers/tty/Makefile              |   3 +-
 drivers/tty/ttynull.c             |  18 +++
 include/linux/console.h           |   3 +
 init/main.c                       |  10 +-
 kernel/printk/printk.c            | 257 +++++++++++++++++++++++---------------
 kernel/printk/printk_ringbuffer.c |  32 +++--
 7 files changed, 200 insertions(+), 137 deletions(-)