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rcu: Convert ->completedqs to ->gp_seq

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This commit switches the quiescent-state no-backtracking checks from
->gpnum and ->completed to ->gp_seq.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2018-04-28 18:50:06 -07:00
parent 8aa670cdac
commit d43a5d32e1
2 changed files with 4 additions and 4 deletions
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4
kernel/rcu/tree_plugin.h
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@@ -262,7 +262,7 @@ static void rcu_preempt_ctxt_queue(struct rcu_node *rnp, struct rcu_data *rdp)
*/
if (!rnp->gp_tasks && (blkd_state & RCU_GP_BLKD)) {
rnp->gp_tasks = &t->rcu_node_entry;
WARN_ON_ONCE(rnp->completedqs == rnp->gpnum);
WARN_ON_ONCE(rnp->completedqs == rnp->gp_seq);
}
if (!rnp->exp_tasks && (blkd_state & RCU_EXP_BLKD))
rnp->exp_tasks = &t->rcu_node_entry;
@@ -537,7 +537,7 @@ void rcu_read_unlock_special(struct task_struct *t)
WARN_ON_ONCE(rnp != t->rcu_blocked_node);
WARN_ON_ONCE(!rcu_is_leaf_node(rnp));
empty_norm = !rcu_preempt_blocked_readers_cgp(rnp);
WARN_ON_ONCE(rnp->completedqs == rnp->gpnum &&
WARN_ON_ONCE(rnp->completedqs == rnp->gp_seq &&
(!empty_norm || rnp->qsmask));
empty_exp = sync_rcu_preempt_exp_done(rnp);
smp_mb(); /* ensure expedited fastpath sees end of RCU c-s. */