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@xxxxxxxxxx>
---
kernel/rcu/tree_stall.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h
index 42847caa3909b..6dd6c9aa3f757 100644
--- a/kernel/rcu/tree_stall.h
+++ b/kernel/rcu/tree_stall.h
@@ -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))
--
2.31.1.189.g2e36527f23
