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

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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>
This commit is contained in:
Paul E. McKenney 2026-07-11 16:51:41 -07:00
parent 86fa5387b4
commit ed55bb9150
1 changed files with 2 additions and 2 deletions
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4
kernel/rcu/rcutorture.c
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@ -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)