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rcu: Remove ->rgos_polled field from rcu_gp_oldstate structure

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Because both normal and expedited grace periods increment their respective
counters on their pre-scheduler early boot fastpaths, the rcu_gp_oldstate
structure no longer needs its ->rgos_polled field.  This commit therefore
removes this field, shrinking this structure so that it is the same size
as an rcu_head structure.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2022-08-04 17:54:53 -07:00
parent 43ff97cc99
commit 7ecef0871d
2 changed files with 1 additions and 6 deletions
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1
include/linux/rcutree.h
View File

@ -44,7 +44,6 @@ bool rcu_gp_might_be_stalled(void);
struct rcu_gp_oldstate {
unsigned long rgos_norm;
unsigned long rgos_exp;
unsigned long rgos_polled;
};
unsigned long start_poll_synchronize_rcu_expedited(void);

6
kernel/rcu/tree.c
View File

@ -3526,7 +3526,6 @@ void get_completed_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp)
{
rgosp->rgos_norm = RCU_GET_STATE_COMPLETED;
rgosp->rgos_exp = RCU_GET_STATE_COMPLETED;
rgosp->rgos_polled = RCU_GET_STATE_COMPLETED;
}
EXPORT_SYMBOL_GPL(get_completed_synchronize_rcu_full);
@ -3575,7 +3574,6 @@ void get_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp)
smp_mb(); /* ^^^ */
rgosp->rgos_norm = rcu_seq_snap(&rnp->gp_seq);
rgosp->rgos_exp = rcu_seq_snap(&rcu_state.expedited_sequence);
rgosp->rgos_polled = rcu_seq_snap(&rcu_state.gp_seq_polled);
}
EXPORT_SYMBOL_GPL(get_state_synchronize_rcu_full);
@ -3727,9 +3725,7 @@ bool poll_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp)
if (rgosp->rgos_norm == RCU_GET_STATE_COMPLETED ||
rcu_seq_done_exact(&rnp->gp_seq, rgosp->rgos_norm) ||
rgosp->rgos_exp == RCU_GET_STATE_COMPLETED ||
rcu_seq_done_exact(&rcu_state.expedited_sequence, rgosp->rgos_exp) ||
rgosp->rgos_polled == RCU_GET_STATE_COMPLETED ||
rcu_seq_done_exact(&rcu_state.gp_seq_polled, rgosp->rgos_polled)) {
rcu_seq_done_exact(&rcu_state.expedited_sequence, rgosp->rgos_exp)) {
smp_mb(); /* Ensure GP ends before subsequent accesses. */
return true;
}