From: "Paul E. McKenney" <[email protected]> It turns out that only one CPU at a time will ever invoke rcu_torture_pipe_update_one() on a given rcu_torture structure. This commit therefore adds three ASSERT_EXCLUSIVE_WRITER() calls to enlist KCSAN's aid in checking this.
Signed-off-by: Paul E. McKenney <[email protected]> Cc: Linus Torvalds <[email protected]> Reviewed-by: Joel Fernandes (Google) <[email protected]> Signed-off-by: Uladzislau Rezki (Sony) <[email protected]> --- kernel/rcu/rcutorture.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index eff51a26216f..d8c12eba35b7 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -466,6 +466,7 @@ rcu_torture_pipe_update_one(struct rcu_torture *rp) i = RCU_TORTURE_PIPE_LEN; atomic_inc(&rcu_torture_wcount[i]); WRITE_ONCE(rp->rtort_pipe_count, i + 1); + ASSERT_EXCLUSIVE_WRITER(rp->rtort_pipe_count); if (rp->rtort_pipe_count >= RCU_TORTURE_PIPE_LEN) { rp->rtort_mbtest = 0; return true; @@ -1399,6 +1400,7 @@ rcu_torture_writer(void *arg) if (rp == NULL) continue; rp->rtort_pipe_count = 0; + ASSERT_EXCLUSIVE_WRITER(rp->rtort_pipe_count); rcu_torture_writer_state = RTWS_DELAY; udelay(torture_random(&rand) & 0x3ff); rcu_torture_writer_state = RTWS_REPLACE; @@ -1414,6 +1416,7 @@ rcu_torture_writer(void *arg) atomic_inc(&rcu_torture_wcount[i]); WRITE_ONCE(old_rp->rtort_pipe_count, old_rp->rtort_pipe_count + 1); + ASSERT_EXCLUSIVE_WRITER(old_rp->rtort_pipe_count); // Make sure readers block polled grace periods. if (cur_ops->get_gp_state && cur_ops->poll_gp_state) { -- 2.39.2
