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rcu: Mark ->expmask access in synchronize_rcu_expedited_wait() 

This commit adds a READ_ONCE() to an access to the rcu_node structure's
->expmask field to prevent compiler mischief.  Detected by KCSAN.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2021-12-13 21:00:02 -08:00
parent 4d266c247d
commit 63c564da11
1 changed files with 2 additions and 1 deletions
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3
kernel/rcu/tree_exp.h
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@ -502,7 +502,8 @@ static void synchronize_rcu_expedited_wait(void)
if (synchronize_rcu_expedited_wait_once(1))
return;
rcu_for_each_leaf_node(rnp) {
for_each_leaf_node_cpu_mask(rnp, cpu, rnp->expmask) {
mask = READ_ONCE(rnp->expmask);
for_each_leaf_node_cpu_mask(rnp, cpu, mask) {
rdp = per_cpu_ptr(&rcu_data, cpu);
if (rdp->rcu_forced_tick_exp)
continue;