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It allows architectures such\nas x86-64 to combine the store and the barrier into a more efficient\ninstruction, e.g. lock-prefixed xchg.\n\nSigned-off-by: Mathieu Desnoyers \u003cmathieu.desnoyers@efficios.com\u003e\nChange-Id: I045a62f6fe75ea114440ea9a919c8d8e4bf48c09\n","web_links":[{"name":"gitweb","tooltip":"Open in GitWeb","url":"/gitweb?p\u003duserspace-rcu.git;a\u003dcommit;h\u003df4ceb54fc7b13e4c60b44008353c6c665c46f43e"}],"resolve_conflicts_web_links":[{"name":"gitweb","tooltip":"Open in GitWeb","url":"/gitweb?p\u003duserspace-rcu.git;a\u003dcommit;h\u003df4ceb54fc7b13e4c60b44008353c6c665c46f43e"}]},"branch":"refs/heads/master"},"527a44a0f0740178c6c52af1f50275c820c2ae38":{"kind":"REWORK","_number":2,"created":"2026-01-08 14:33:20.000000000","uploader":{"_account_id":1000009,"name":"Mathieu Desnoyers","email":"mathieu.desnoyers@efficios.com","username":"compudj","avatars":[{"url":"https://www.gravatar.com/avatar/7326b3e1d32b971a5e69d9730228c428.jpg?d\u003dretro\u0026r\u003dr\u0026s\u003d32","height":32},{"url":"https://www.gravatar.com/avatar/7326b3e1d32b971a5e69d9730228c428.jpg?d\u003dretro\u0026r\u003dr\u0026s\u003d56","height":56},{"url":"https://www.gravatar.com/avatar/7326b3e1d32b971a5e69d9730228c428.jpg?d\u003dretro\u0026r\u003dr\u0026s\u003d100","height":100},{"url":"https://www.gravatar.com/avatar/7326b3e1d32b971a5e69d9730228c428.jpg?d\u003dretro\u0026r\u003dr\u0026s\u003d120","height":120}]},"ref":"refs/changes/53/16153/2","fetch":{"anonymous http":{"url":"https://review.lttng.org/userspace-rcu","ref":"refs/changes/53/16153/2","commands":{"Branch":"git fetch https://review.lttng.org/userspace-rcu refs/changes/53/16153/2 \u0026\u0026 git checkout -b change-16153 FETCH_HEAD","Checkout":"git fetch https://review.lttng.org/userspace-rcu refs/changes/53/16153/2 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.lttng.org/userspace-rcu refs/changes/53/16153/2 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.lttng.org/userspace-rcu refs/changes/53/16153/2 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.lttng.org/userspace-rcu refs/changes/53/16153/2","Reset To":"git fetch https://review.lttng.org/userspace-rcu refs/changes/53/16153/2 \u0026\u0026 git reset --hard FETCH_HEAD"}}},"commit":{"parents":[{"commit":"9e6448da9b9270ece27c9e23460ce98408fa3b51","subject":"urcu-qsbr: Use CMM_SEQ_CST_FENCE for quiescent state update and offline","web_links":[{"name":"gitweb","tooltip":"Open in GitWeb","url":"/gitweb?p\u003duserspace-rcu.git;a\u003dcommit;h\u003d9e6448da9b9270ece27c9e23460ce98408fa3b51"}]}],"author":{"name":"Mathieu Desnoyers","email":"mathieu.desnoyers@efficios.com","date":"2026-01-07 18:13:57.000000000","tz":-300},"committer":{"name":"Mathieu Desnoyers","email":"mathieu.desnoyers@efficios.com","date":"2026-01-08 14:29:18.000000000","tz":-300},"subject":"urcu-mb: Use CMM_SEQ_CST_FENCE for _urcu_mb_read_lock_update","message":"urcu-mb: Use CMM_SEQ_CST_FENCE for _urcu_mb_read_lock_update\n\n_urcu_mb_read_lock_update currently does a relaxed store to\nrcu_reader.ctr followed by a cmm_smp_mb() (full barrier).\n\nThe store and the full barrier can be combined into a CMM_SEQ_CST_FENCE\nstore while preserving the same semantic. 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