Fake workload for read-side critical section of rcutorture stress test is implemented as a loop of hundred meaningless iterations. However, the loop can be optimized out by compiler because there is nothing to avoid such optimization. This commit protect the fake workload by using a compiler memory barrier, ACCESS_ONCE(). Signed-off-by: SeongJae Park <sj38.park@xxxxxxxxx> --- CodeSamples/defer/rcutorture.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/CodeSamples/defer/rcutorture.h b/CodeSamples/defer/rcutorture.h index 6ea0c09..c5bc87e 100644 --- a/CodeSamples/defer/rcutorture.h +++ b/CodeSamples/defer/rcutorture.h @@ -271,7 +271,7 @@ void *rcu_read_stress_test(void *arg) n_mberror++; rcu_read_lock_nest(); for (i = 0; i < 100; i++) - garbage++; + ACCESS_ONCE(garbage)++; rcu_read_unlock_nest(); pc = p->pipe_count; rcu_read_unlock(); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe perfbook" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
