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rcu: Move rcu_data.cpu_no_qs.b.exp reset to rcu_export_exp_rdp() 

On non-preemptible RCU, move clearing of the rcu_data structure's
->cpu_no_qs.b.exp filed to the actual expedited quiescent state report
function, matching hw preemptible RCU handles the ->exp_deferred_qs field.

This prepares for removing ->exp_deferred_qs in favor of ->cpu_no_qs.b.exp
for both preemptible and non-preemptible RCU.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Frederic Weisbecker 2021-09-16 14:10:47 +02:00 committed by Paul E. McKenney
parent a438265948
commit 6e16b0f7ba
2 changed files with 3 additions and 4 deletions
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1
kernel/rcu/tree_exp.h
View File

@ -256,6 +256,7 @@ static void rcu_report_exp_cpu_mult(struct rcu_node *rnp,
static void rcu_report_exp_rdp(struct rcu_data *rdp)
{
WRITE_ONCE(rdp->exp_deferred_qs, false);
WRITE_ONCE(rdp->cpu_no_qs.b.exp, false);
rcu_report_exp_cpu_mult(rdp->mynode, rdp->grpmask, true);
}

6
kernel/rcu/tree_plugin.h
View File

@ -849,10 +849,8 @@ static void rcu_qs(void)
trace_rcu_grace_period(TPS("rcu_sched"),
__this_cpu_read(rcu_data.gp_seq), TPS("cpuqs"));
__this_cpu_write(rcu_data.cpu_no_qs.b.norm, false);
if (!__this_cpu_read(rcu_data.cpu_no_qs.b.exp))
return;
__this_cpu_write(rcu_data.cpu_no_qs.b.exp, false);
rcu_report_exp_rdp(this_cpu_ptr(&rcu_data));
if (__this_cpu_read(rcu_data.cpu_no_qs.b.exp))
rcu_report_exp_rdp(this_cpu_ptr(&rcu_data));
}
/*