linux-kernel - [GIT PULL clocksource] Clocksource watchdog commits for v5.14

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Message-ID: <20210609233723.GA1717240@paulmck-ThinkPad-P17-Gen-1>
Date:   Wed, 9 Jun 2021 16:37:23 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, john.stultz@...aro.org,
        sboyd@...nel.org, corbet@....net, Mark.Rutland@....com,
        maz@...nel.org, kernel-team@...com, neeraju@...eaurora.org,
        ak@...ux.intel.com, feng.tang@...el.com, zhengjun.xing@...el.com,
        luming.yu@...el.com
Subject: [GIT PULL clocksource] Clocksource watchdog commits for v5.14

Hello, Thomas,

This pull request contains changes to cause the clocksource watchdog to
reject measurement noise caused by delays between clocksource reads.
These have been posted a few times to LKML, most recently v15:

https://lore.kernel.org/lkml/20210527190042.GA438700@paulmck-ThinkPad-P17-Gen-1/

These have been acked by Feng Tang and reviewed by Luming Yu.  These have
also been subjected to subjected to the kbuild test robot and -next
testing, and are available in the git repository based on v5.13-rc1 at:

  git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git clocksource

for you to fetch changes up to 023766fbdde49c75c13acd268bf9af810d624c59:

  clocksource: Print deviation in nanoseconds for unstable case (2021-06-04 13:20:31 -0700)

----------------------------------------------------------------
Feng Tang (1):
      clocksource: Print deviation in nanoseconds for unstable case

Paul E. McKenney (5):
      clocksource: Retry clock read if long delays detected
      clocksource: Check per-CPU clock synchronization when marked unstable
      clocksource: Limit number of CPUs checked for clock synchronization
      clocksource: Reduce clocksource-skew threshold for TSC
      clocksource: Provide kernel module to test clocksource watchdog

 Documentation/admin-guide/kernel-parameters.txt |  22 +++
 arch/x86/kernel/tsc.c                           |   4 +-
 include/linux/clocksource.h                     |   8 +-
 kernel/time/Makefile                            |   1 +
 kernel/time/clocksource-wdtest.c                | 202 +++++++++++++++++++++
 kernel/time/clocksource.c                       | 226 ++++++++++++++++++++++--
 kernel/time/jiffies.c                           |  15 +-
 lib/Kconfig.debug                               |  12 ++
 8 files changed, 468 insertions(+), 22 deletions(-)
 create mode 100644 kernel/time/clocksource-wdtest.c