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rcu: Mark lockless ->qsmask read in rcu_check_boost_fail()

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Accesses to ->qsmask are normally protected by ->lock, but there is an
exception in the diagnostic code in rcu_check_boost_fail().  This commit
therefore applies data_race() to this access to avoid KCSAN complaining
about the C-language writes protected by ->lock.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2021-06-03 10:17:36 -07:00
parent 65bfdd36c1
commit d9ee962feb
1 changed files with 1 additions and 1 deletions
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2
kernel/rcu/tree_stall.h
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@ -766,7 +766,7 @@ bool rcu_check_boost_fail(unsigned long gp_state, int *cpup)
rcu_for_each_leaf_node(rnp) {
if (!cpup) {
if (READ_ONCE(rnp->qsmask)) {
if (data_race(READ_ONCE(rnp->qsmask))) {
return false;
} else {
if (READ_ONCE(rnp->gp_tasks))