All of lore.kernel.org
 help / color / mirror / Atom feed
From: John Ogness <john.ogness@linutronix.de>
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
Subject: [PATCH printk-rework 00/12] printk: remove logbuf_lock
Date: Tue, 26 Jan 2021 22:21:39 +0106	[thread overview]
Message-ID: <20210126211551.26536-1-john.ogness@linutronix.de> (raw)

Hello,

This series removes @logbuf_lock, exposing the ringbuffer locklessly
to both readers and writers. And since @logbuf_lock was protecting
much more than just the ringbuffer, this series clarifies and cleans
up the various protections using comments, lockless accessors,
atomic types, and a new finer-grained @syslog_log.

This series takes into account the feedback from [0], which was a
series that was partially merged in 5.11.

The first few patches (1-5) are general cleanups to help simplify
later patches. They probably are important enough to stand alone.

John Ogness

[0] https://lkml.kernel.org/r/20201201205341.3871-1-john.ogness@linutronix.de

John Ogness (12):
  printk: kmsg_dump: remove unused fields
  printk: refactor kmsg_dump_get_buffer()
  printk: consolidate kmsg_dump_get_buffer/syslog_print_all code
  printk: define CONSOLE_LOG_MAX in printk.h
  printk: use seqcount_latch for clear_seq
  printk: use atomic64_t for devkmsg_user.seq
  printk: add syslog_lock
  printk: introduce a kmsg_dump iterator
  um: synchronize kmsg_dumper
  hv: synchronize kmsg_dumper
  printk: remove logbuf_lock
  printk: kmsg_dump: remove _nolock() variants

 arch/powerpc/kernel/nvram_64.c             |  12 +-
 arch/powerpc/platforms/powernv/opal-kmsg.c |   3 +-
 arch/powerpc/xmon/xmon.c                   |   6 +-
 arch/um/kernel/kmsg_dump.c                 |  13 +-
 drivers/hv/vmbus_drv.c                     |  17 +-
 drivers/mtd/mtdoops.c                      |   5 +-
 fs/pstore/platform.c                       |   5 +-
 include/linux/kmsg_dump.h                  |  52 +--
 include/linux/printk.h                     |   1 +
 kernel/debug/kdb/kdb_main.c                |  10 +-
 kernel/printk/internal.h                   |   4 +-
 kernel/printk/printk.c                     | 427 ++++++++++-----------
 kernel/printk/printk_safe.c                |  29 +-
 13 files changed, 281 insertions(+), 303 deletions(-)

-- 
2.20.1


             reply	other threads:[~2021-01-27  3:28 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-26 21:15 John Ogness [this message]
2021-01-26 21:15 ` [PATCH printk-rework 01/12] printk: kmsg_dump: remove unused fields John Ogness
2021-01-26 21:15 ` [PATCH printk-rework 02/12] printk: refactor kmsg_dump_get_buffer() John Ogness
2021-01-26 21:15 ` [PATCH printk-rework 03/12] printk: consolidate kmsg_dump_get_buffer/syslog_print_all code John Ogness
     [not found]   ` <YBQgTQYTA5p6Wgj6@alley>
2021-02-01  9:49     ` John Ogness
2021-02-02 12:31       ` Petr Mladek
2021-01-26 21:15 ` [PATCH printk-rework 04/12] printk: define CONSOLE_LOG_MAX in printk.h John Ogness
     [not found]   ` <YBQtbKrdwUAZQB9v@alley>
2021-02-01  8:24     ` LINE_MAX: was: " John Ogness
2021-02-02 11:22       ` Petr Mladek
2021-01-26 21:15 ` [PATCH printk-rework 05/12] printk: use seqcount_latch for clear_seq John Ogness
2021-01-26 21:15 ` [PATCH printk-rework 06/12] printk: use atomic64_t for devkmsg_user.seq John Ogness
2021-01-26 21:15 ` [PATCH printk-rework 07/12] printk: add syslog_lock John Ogness
2021-02-01 12:26   ` Petr Mladek
2021-02-01 13:11     ` John Ogness
2021-02-02 12:50       ` Petr Mladek
2021-01-26 21:15 ` [PATCH printk-rework 08/12] printk: introduce a kmsg_dump iterator John Ogness
2021-02-01 13:17   ` Petr Mladek
2021-02-01 13:32     ` John Ogness
2021-01-26 21:15 ` [PATCH printk-rework 09/12] um: synchronize kmsg_dumper John Ogness
2021-02-01 10:26   ` Petr Mladek
2021-02-01 14:15   ` Petr Mladek
2021-02-01 16:51     ` John Ogness
2021-02-01 16:54       ` Richard Weinberger
2021-02-01 20:25         ` John Ogness
2021-02-01 20:40           ` Richard Weinberger
2021-02-02 13:26       ` Petr Mladek
2021-01-26 21:15 ` [PATCH printk-rework 10/12] hv: " John Ogness
2021-01-27 21:32   ` Michael Kelley
2021-02-01 10:56     ` John Ogness
2021-01-26 21:15 ` [PATCH printk-rework 11/12] printk: remove logbuf_lock John Ogness
2021-02-02  9:15   ` Petr Mladek
2021-02-02 11:41     ` John Ogness
2021-02-02 16:11       ` Petr Mladek
2021-01-26 21:15 ` [PATCH printk-rework 12/12] printk: kmsg_dump: remove _nolock() variants John Ogness
2021-02-02  9:45   ` Petr Mladek

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210126211551.26536-1-john.ogness@linutronix.de \
    --to=john.ogness@linutronix.de \
    --cc=linux-kernel@vger.kernel.org \
    --cc=pmladek@suse.com \
    --cc=rostedt@goodmis.org \
    --cc=sergey.senozhatsky.work@gmail.com \
    --cc=sergey.senozhatsky@gmail.com \
    --cc=tglx@linutronix.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.