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rcu: Remove unused expedited_need_qs field from rcu_state

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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>
This commit is contained in:
Joel Fernandes 2026-07-18 13:15:32 -04:00 committed by Paul E. McKenney
parent a050e671d3
commit 4137d69124
1 changed files with 0 additions and 1 deletions
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kernel/rcu/tree.h
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@ -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? */