linux-kernel - [PATCH next v1 0/3] printk: remove safe buffers

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Date:   Wed, 17 Mar 2021 00:33:23 +0100
From:   John Ogness <john.ogness@...utronix.de>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Eric Biederman <ebiederm@...ssion.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Alistair Popple <alistair@...ple.id.au>,
        Jordan Niethe <jniethe5@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Cédric Le Goater <clg@...d.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>, Yue Hu <huyue2@...ong.com>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Rafael Aquini <aquini@...hat.com>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        "Guilherme G. Piccoli" <gpiccoli@...onical.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        linuxppc-dev@...ts.ozlabs.org, kexec@...ts.infradead.org
Subject: [PATCH next v1 0/3] printk: remove safe buffers

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