[GIT PULL] printk for 6.7

[GIT PULL] printk for 6.7

[Petr Mladek]

Hi Linus,

please pull the latest printk changes from

  git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux.git tags/printk-for-6.7

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

- Another preparation step for introducing printk kthreads. The main piece
  is a per-console lock with several features:

    - Support three priorities: normal, emergency, and panic. They will be
      defined by a context where the lock is taken. A context with a higher
      priority is allowed to take over the lock from a context with a lower
      one.

      The plan is to use the emergency context for Oops and WARN() messages,
      and also by watchdogs.

      The panic() context will be used on panic CPU.

    - The owner might enter/exit regions where it is not safe to take over
      the lock. It allows the take over the lock a safe way in the middle
      of a message.

      For example, serial drivers emit characters one by one. And
      the serial port is in a safe state in between.

      Only the final console_flush_in_panic() will be allowed to take over
      the lock even in the unsafe state (last chance, pray, and hope).

    - A higher priority context might busy wait with a timeout. The current
      owner is informed about the waiter and releases the lock on exit from
      the unsafe state.

    - The new lock is safe even in atomic contexts, including NMI.

  Another change is a safe manipulation of per-console sequence number
  counter under the new lock.

- simple_strntoull() micro-optimization

- Reduce pr_flush() pooling time.

- Calm down false warning about possible buffer invalid access to
  console buffers when CONFIG_PRINTK is disabled.

----------------------------------------------------------------
Alexey Dobriyan (1):
      vsprintf: uninline simple_strntoull(), reorder arguments

John Ogness (3):
      printk: Make static printk buffers available to nbcon
      printk: fix illegal pbufs access for !CONFIG_PRINTK
      printk: flush consoles before checking progress

Li kunyu (1):
      printk: printk: Remove unnecessary statements＇len = 0;＇

Petr Mladek (5):
      Merge branch 'rework/misc-cleanups' into for-linus
      printk: Reduce pr_flush() pooling time
      Merge branch 'for-6.7' into for-linus
      Merge branch 'rework/misc-cleanups' into for-linus
      Merge branch 'rework/nbcon-base' into for-linus

Thomas Gleixner (7):
      printk: Add non-BKL (nbcon) console basic infrastructure
      printk: nbcon: Add acquire/release logic
      printk: nbcon: Add buffer management
      printk: nbcon: Add ownership state functions
      printk: nbcon: Add sequence handling
      printk: nbcon: Add emit function and callback function for atomic printing
      printk: nbcon: Allow drivers to mark unsafe regions and check state

 include/linux/console.h  |  129 ++++++
 kernel/printk/Makefile   |    2 +-
 kernel/printk/internal.h |   31 ++
 kernel/printk/nbcon.c    | 1029 ++++++++++++++++++++++++++++++++++++++++++++++
 kernel/printk/printk.c   |  158 ++++---
 lib/vsprintf.c           |   25 +-
 6 files changed, 1295 insertions(+), 79 deletions(-)
 create mode 100644 kernel/printk/nbcon.c

Re: [GIT PULL] printk for 6.7

[Thomas Gleixner]

On Thu, Nov 02 2023 at 17:22, Petr Mladek wrote:
> Thomas Gleixner (7):
>       printk: Add non-BKL (nbcon) console basic infrastructure
>       printk: nbcon: Add acquire/release logic
>       printk: nbcon: Add buffer management
>       printk: nbcon: Add ownership state functions
>       printk: nbcon: Add sequence handling
>       printk: nbcon: Add emit function and callback function for atomic printing
>       printk: nbcon: Allow drivers to mark unsafe regions and check state

TBH, I'm truly surprised to still see my name there as the author.

I definitely authored the early revisions and was influential on the
design, but comparing the final result to my initial hacked up POC
patches does not really reflect that.

It's probably too late to correct that, but I nevertheless want to make
it clear that:

   John Ogness and Peter Mladek have been the ones who sorted out the
   details and really should be those who get the credit.

Kodos to John and Peter for making this work!

Thanks,

        Thomas

Re: [GIT PULL] printk for 6.7

[pr-tracker-bot]

The pull request you sent on Thu, 2 Nov 2023 17:22:45 +0100:

> git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux.git tags/printk-for-6.7

has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/2a80532c0745e140852e6b579bbe8371332bb45d

Thank you!

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