[PATCH 11/11] rcutorture: Use this_cpu_inc() for rcu_torture_count[] and rcu_torture_batch[]

["Paul E. McKenney" <paulmck@kernel.org>]

Currently __this_cpu_inc() is used to increment elements of both
the rcu_torture_count[] and rcu_torture_batch[] arrays.  However,
this can fail when the increments can happen in interrupt handlers,
as recently became possible.  This commit therefore upgrades the uses
of __this_cpu_inc() to the interrupt-safe this_cpu_inc().

KCSAN located this issue.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
 kernel/rcu/rcutorture.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 8514fef3ec10b6..9180016d87c0ce 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -2565,13 +2565,13 @@ static void rcu_torture_one_read_end(struct rcu_torture_one_read_state *rtorsp,
 					  rtorsp->ts, rtorsp->started, completed);
 		rcu_ftrace_dump(DUMP_ALL);
 	}
-	__this_cpu_inc(rcu_torture_count[pipe_count]);
+	this_cpu_inc(rcu_torture_count[pipe_count]);
 	completed = rcutorture_seq_diff(completed, rtorsp->started);
 	if (completed > RCU_TORTURE_PIPE_LEN) {
 		/* Should not happen, but... */
 		completed = RCU_TORTURE_PIPE_LEN;
 	}
-	__this_cpu_inc(rcu_torture_batch[completed]);
+	this_cpu_inc(rcu_torture_batch[completed]);
 	preempt_enable();
 	if (rtorsp->checkpolling) {
 		if (cur_ops->get_gp_state && cur_ops->poll_gp_state)
-- 
2.40.1