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rcu: Mark sync_sched_exp_online_cleanup() ->cpu_no_qs.b.exp load

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The sync_sched_exp_online_cleanup() is called from rcutree_online_cpu(),
which can be invoked with interrupts enabled.  This means that
the ->cpu_no_qs.b.exp field is subject to data races from the
rcu_exp_handler() IPI handler, so this commit marks the load from
that field.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2021-09-28 11:06:35 -07:00
parent 6120b72e25
commit 5401cc5264
1 changed files with 1 additions and 1 deletions
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2
kernel/rcu/tree_exp.h
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@ -759,7 +759,7 @@ static void sync_sched_exp_online_cleanup(int cpu)
my_cpu = get_cpu();
/* Quiescent state either not needed or already requested, leave. */
if (!(READ_ONCE(rnp->expmask) & rdp->grpmask) ||
rdp->cpu_no_qs.b.exp) {
READ_ONCE(rdp->cpu_no_qs.b.exp)) {
put_cpu();
return;
}