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rcutorture: Verify NUM_ACTIVE_RCU_POLL_OLDSTATE

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This commit adds code to the RTWS_POLL_GET case of rcu_torture_writer()
to verify that the value of NUM_ACTIVE_RCU_POLL_OLDSTATE is sufficiently
large

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2022-08-25 15:47:09 -07:00
parent 1d5ebc351f
commit 1324d95b1c
1 changed files with 20 additions and 2 deletions
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22
kernel/rcu/rcutorture.c
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@ -357,7 +357,9 @@ struct rcu_torture_ops {
bool (*poll_gp_state_exp)(unsigned long oldstate);
void (*cond_sync_exp)(unsigned long oldstate);
void (*cond_sync_exp_full)(struct rcu_gp_oldstate *rgosp);
unsigned long (*get_comp_state)(void);
void (*get_comp_state_full)(struct rcu_gp_oldstate *rgosp);
bool (*same_gp_state)(unsigned long oldstate1, unsigned long oldstate2);
bool (*same_gp_state_full)(struct rcu_gp_oldstate *rgosp1, struct rcu_gp_oldstate *rgosp2);
unsigned long (*get_gp_state)(void);
void (*get_gp_state_full)(struct rcu_gp_oldstate *rgosp);
@ -537,7 +539,9 @@ static struct rcu_torture_ops rcu_ops = {
.deferred_free = rcu_torture_deferred_free,
.sync = synchronize_rcu,
.exp_sync = synchronize_rcu_expedited,
.same_gp_state = same_state_synchronize_rcu,
.same_gp_state_full = same_state_synchronize_rcu_full,
.get_comp_state = get_completed_synchronize_rcu,
.get_comp_state_full = get_completed_synchronize_rcu_full,
.get_gp_state = get_state_synchronize_rcu,
.get_gp_state_full = get_state_synchronize_rcu_full,
@ -1262,7 +1266,8 @@ static void rcu_torture_write_types(void)
} else if (gp_normal && !cur_ops->deferred_free) {
pr_alert("%s: gp_normal without primitives.\n", __func__);
}
if (gp_poll1 && cur_ops->start_gp_poll && cur_ops->poll_gp_state) {
if (gp_poll1 && cur_ops->get_comp_state && cur_ops->same_gp_state &&
cur_ops->start_gp_poll && cur_ops->poll_gp_state) {
synctype[nsynctypes++] = RTWS_POLL_GET;
pr_info("%s: Testing polling GPs.\n", __func__);
} else if (gp_poll && (!cur_ops->start_gp_poll || !cur_ops->poll_gp_state)) {
@ -1344,6 +1349,7 @@ rcu_torture_writer(void *arg)
struct rcu_gp_oldstate cookie_full;
int expediting = 0;
unsigned long gp_snap;
unsigned long gp_snap1;
struct rcu_gp_oldstate gp_snap_full;
struct rcu_gp_oldstate gp_snap1_full;
int i;
@ -1354,6 +1360,7 @@ rcu_torture_writer(void *arg)
struct rcu_torture *old_rp;
static DEFINE_TORTURE_RANDOM(rand);
bool stutter_waited;
unsigned long ulo[NUM_ACTIVE_RCU_POLL_OLDSTATE];
VERBOSE_TOROUT_STRING("rcu_torture_writer task started");
if (!can_expedite)
@ -1470,11 +1477,22 @@ rcu_torture_writer(void *arg)
break;
case RTWS_POLL_GET:
rcu_torture_writer_state = RTWS_POLL_GET;
for (i = 0; i < ARRAY_SIZE(ulo); i++)
ulo[i] = cur_ops->get_comp_state();
gp_snap = cur_ops->start_gp_poll();
rcu_torture_writer_state = RTWS_POLL_WAIT;
while (!cur_ops->poll_gp_state(gp_snap))
while (!cur_ops->poll_gp_state(gp_snap)) {
gp_snap1 = cur_ops->get_gp_state();
for (i = 0; i < ARRAY_SIZE(ulo); i++)
if (cur_ops->poll_gp_state(ulo[i]) ||
cur_ops->same_gp_state(ulo[i], gp_snap1)) {
ulo[i] = gp_snap1;
break;
}
WARN_ON_ONCE(i >= ARRAY_SIZE(ulo));
torture_hrtimeout_jiffies(torture_random(&rand) % 16,
&rand);
}
rcu_torture_pipe_update(old_rp);
break;
case RTWS_POLL_GET_FULL: