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From: John Ogness <john.ogness@linutronix.de>
Subject: [PATCH next v1 0/3] printk: remove safe buffers
Date: Wed, 17 Mar 2021 00:33:23 +0100
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To: Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>, Sergey Senozhatsky <sergey.senozhatsky@gmail.com>, Steven Rostedt <rostedt@goodmis.org>, Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org, Michael Ellerman <mpe@ellerman.id.au>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, Eric Biederman <ebiederm@xmission.com>, Nicholas Piggin <npiggin@gmail.com>, Christophe Leroy <christophe.leroy@csgroup.eu>, Alistair Popple <alistair@popple.id.au>, Jordan Niethe <jniethe5@gmail.com>, Peter Zijlstra <peterz@infradead.org>, =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@kaod.org>, Andrew Morton <akpm@linux-foundation.org>, Kees Cook <keescook@chromium.org>, Yue Hu <huyue2@yulong.com>, Alexey Kardashevskiy <aik@ozlabs.ru>, Rafael Aquini <aquini@redhat.com>, Tiezhu Yang <yangtiezhu@loongson.cn>, "Guilherme G. Piccoli" <gpiccoli@canonical.com>, "Paul E. McKenney" <paulmck@kernel.org>, linuxppc-dev@lists.ozlabs.org, kexec@lists.infradead.org

Hello,

Here is v1 of a series to remove the safe buffers. They are no
longer needed because messages can be stored directly into the
log buffer from any context.

However, the safe buffers also provided a form of recursion
protection. For that reason, explicit recursion protection is
also implemented for this series.

This series falls in line with the printk-rework plan as
presented [0] at Linux Plumbers in Lisbon 2019.

This series is based on next-20210316.

John Ogness

[0] https://linuxplumbersconf.org/event/4/contributions/290/attachments/276/463/lpc2019_jogness_printk.pdf (slide 23)

John Ogness (3):
  printk: track/limit recursion
  printk: remove safe buffers
  printk: convert @syslog_lock to spin_lock

 arch/powerpc/kernel/traps.c    |   1 -
 arch/powerpc/kernel/watchdog.c |   5 -
 include/linux/printk.h         |  10 -
 kernel/kexec_core.c            |   1 -
 kernel/panic.c                 |   3 -
 kernel/printk/internal.h       |   2 -
 kernel/printk/printk.c         | 171 +++++++++--------
 kernel/printk/printk_safe.c    | 332 +--------------------------------
 lib/nmi_backtrace.c            |   6 -
 9 files changed, 100 insertions(+), 431 deletions(-)

-- 
2.20.1


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