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Date:   Wed, 22 Feb 2017 12:47:06 +0100
From:   Petr Mladek <>
To:     Linus Torvalds <>
Cc:     Sergey Senozhatsky <>,
        Steven Rostedt <>,
        Peter Zijlstra <>,
Subject: [GIT PULL] printk for 4.11


please pull from

  git:// for-linus

to receive printk queue for 4.11 merge window:


- Add Petr Mladek, Sergey Senozhatsky as printk maintainers,
  and Steven Rostedt as the printk reviewer. This idea came up
  after the discussion about printk issues at Kernel Summit.
  It was formulated and discussed at lkml[1].

- Extend a lock-less NMI per-cpu buffers idea to handle recursive
  printk() calls by Sergey Senozhatsky[2]. It is the first step
  in sanitizing printk as discussed at Kernel Summit.

  The change allows to see messages that would normally get ignored
  or would cause a deadlock.

  Also it allows to enable lockdep in printk(). This already paid
  off. The testing in linux-next helped to discover two old
  problems that were hidden before[3][4].

- Remove unused parameter by Sergey Senozhatsky. Clean up
  after a past change.



Petr Mladek (1):
  MAINTAINERS: Add printk maintainers

Sergey Senozhatsky (9):
  printk: use vprintk_func in vprintk()
  printk: rename nmi.c and exported api
  printk: introduce per-cpu safe_print seq buffer
  printk: always use deferred printk when flush printk_safe lines
  printk: report lost messages in printk safe/nmi contexts
  printk: use printk_safe buffers in printk
  printk: remove zap_locks() function
  printk: convert the rest to printk-safe
  printk: drop call_console_drivers() unused param

 MAINTAINERS                 |   8 +
 include/linux/printk.h      |  21 ++-
 init/Kconfig                |  16 +-
 init/main.c                 |   2 +-
 kernel/kexec_core.c         |   2 +-
 kernel/panic.c              |   4 +-
 kernel/printk/Makefile      |   2 +-
 kernel/printk/internal.h    |  79 +++++----
 kernel/printk/nmi.c         | 291 ---------------------------------
 kernel/printk/printk.c      | 232 ++++++++++++--------------
 kernel/printk/printk_safe.c | 385 ++++++++++++++++++++++++++++++++++++++++++++
 lib/nmi_backtrace.c         |   2 +-
 12 files changed, 568 insertions(+), 476 deletions(-)
 delete mode 100644 kernel/printk/nmi.c
 create mode 100644 kernel/printk/printk_safe.c

Best Regards,
Petr Mladek

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