linux-kernel - [RELEASE] Userspace RCU 0.12.4 and 0.13.2

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Date:   Thu, 18 Aug 2022 16:07:34 -0400 (EDT)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     linux-kernel <linux-kernel@...r.kernel.org>,
        lttng-dev <lttng-dev@...ts.lttng.org>, rp <rp@...s.cs.pdx.edu>
Cc:     paulmck <paulmck@...nel.org>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Lai Jiangshan <jiangshanlai@...il.com>, lwn <lwn@....net>
Subject: [RELEASE] Userspace RCU 0.12.4 and 0.13.2

[ re-sending without html headers. My email client managed to add those without me realizing it. ]

Hi,

This is stable release announcement for the Userspace RCU project.
It covers the two currently maintained stable branches: 0.12 and 0.13,
respectively with releases v0.12.4 and v0.13.2.

Especially for the spurious futex wakeup fix, users of the 0.12 and 0.13 (or older)
liburcu branches are recommended to upgrade.

* Noteworthy in these releases:

- Handle spurious futex wakeups in urcu-qsbr, urcu, urcu-wait, defer_rcu, call_rcu,
  and workqueue code. This has been known to cause issues where the workqueue
  worker thread spuriously takes nearly 100% of CPU time.

- Change method used by _rcu_dereference ot strip type constness.
  Rather than using pointer arithmetic (which does not work with opaque types),
  rely on a statement expression trick.

- Fix support for Linux systems where sysconf(_SC_NPROCESSORS_CONF) can
  return a value less than max cpu id.

Project website: https://liburcu.org

Feedback is welcome!

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com