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| author | Joel Fernandes <joelagnelf@nvidia.com> | 2026-07-18 13:15:32 -0400 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2026-07-24 16:59:23 -0700 |
| commit | 4137d69124a29506a09756af0aaf0c7acd2a60f6 (patch) | |
| tree | 9a289f98d69263727075ee0152a857bac2848586 /kernel/rcu | |
| parent | a050e671d3545cf1890ab764387958be6c542f6c (diff) | |
| download | lwn-4137d69124a29506a09756af0aaf0c7acd2a60f6.tar.gz lwn-4137d69124a29506a09756af0aaf0c7acd2a60f6.zip | |
rcu: Remove unused expedited_need_qs field from rcu_state
The ->expedited_need_qs counter was part of the old expedited
grace-period machinery that spun waiting for each CPU to check in.
The current implementation instead tracks holdout CPUs via the
rcu_node structures' ->expmask fields and waits on the ->exp_wq[]
wait queues, so nothing reads or writes ->expedited_need_qs any
longer.
Remove the field to avoid wasting space in rcu_state and to keep
readers of the expedited code from searching for nonexistent users.
Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index 4069132f9d44..587bd71396ea 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -391,7 +391,6 @@ struct rcu_state { struct mutex exp_mutex; /* Serialize expedited GP. */ struct mutex exp_wake_mutex; /* Serialize wakeup. */ unsigned long expedited_sequence; /* Take a ticket. */ - atomic_t expedited_need_qs; /* # CPUs left to check in. */ struct swait_queue_head expedited_wq; /* Wait for check-ins. */ int ncpus_snap; /* # CPUs seen last time. */ u8 cbovld; /* Callback overload now? */ |