linux-kernel - [RELEASE] Userspace RCU 0.14.2 and 0.15.6

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Message-ID: <d08df9ca-65d5-4873-9205-8b58311c3859@efficios.com>
Date: Mon, 26 Jan 2026 09:36:55 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: linux-kernel@...r.kernel.org, lttng-dev@...ts.lttng.org
Cc: "Paul E. McKenney" <paulmck@...nel.org>,
 Alan Stern <stern@...land.harvard.edu>,
 Lai Jiangshan <jiangshanlai@...il.com>
Subject: [RELEASE] Userspace RCU 0.14.2 and 0.15.6

Hi,

This is a release announcement for liburcu 0.14.2 and 0.15.6,
respectively for the stable 0.14 and 0.15 branches.

The most relevant fix is for the 0.15 branch, where urcu-qsbr
and urcu-mb flavors were missing a barrier between store to
update the per-thread reader counter and the following relaxed
load of the futex waiting state.

* New in this release:

Changelog:

2026-01-26 Userspace RCU 0.15.6
         * urcu-mb: Add missing TSAN annotation to _urcu_mb_read_lock_update
         * lfstack: Coding style cleanup
         * urcu-qsbr: Use CMM_SEQ_CST_FENCE for _urcu_qsbr_thread_online
         * urcu-mb: Use CMM_SEQ_CST_FENCE for _urcu_mb_read_lock_update
         * urcu-qsbr: Use CMM_SEQ_CST_FENCE for quiescent state update and offline
         * urcu-mb: Use CMM_SEQ_CST_FENCE for _urcu_mb_read_unlock_update_and_wakeup
         * Fix: Only include linux/time_types.h when __NR_futex_time64 is defined
         * Use __NR_futex_time64 in futex syscall wrapper

2026-01-26 Userspace RCU 0.14.2
         * Fix: Only include linux/time_types.h when __NR_futex_time64 is defined
         * Use __NR_futex_time64 in futex syscall wrapper
         * Cleanup: Remove useless declarations from urcu-qsbr
         * src/urcu-bp.c: assert => urcu_posix_assert

Project website: https://liburcu.org
Git repository: https://git.liburcu.org/userspace-rcu.git

Thanks,

Mathieu

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