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rcutorture: Verify NUM_ACTIVE_RCU_POLL_FULL_OLDSTATE 

This commit adds code to the RTWS_POLL_GET_FULL case
of rcu_torture_writer() to verify that the value of
NUM_ACTIVE_RCU_POLL_FULL_OLDSTATE is sufficiently large.

[ paulmck: Fix whitespace issue located by checkpatch.pl. ]

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2022-08-25 13:37:59 -07:00
parent 9abf2313ad
commit 1d5ebc351f
1 changed files with 21 additions and 2 deletions
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23
kernel/rcu/rcutorture.c
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@ -357,6 +357,8 @@ 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);
void (*get_comp_state_full)(struct rcu_gp_oldstate *rgosp);
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);
unsigned long (*get_gp_completed)(void);
@ -535,6 +537,8 @@ static struct rcu_torture_ops rcu_ops = {
.deferred_free = rcu_torture_deferred_free,
.sync = synchronize_rcu,
.exp_sync = synchronize_rcu_expedited,
.same_gp_state_full = same_state_synchronize_rcu_full,
.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,
.get_gp_completed = get_completed_synchronize_rcu,
@ -1264,7 +1268,8 @@ static void rcu_torture_write_types(void)
} else if (gp_poll && (!cur_ops->start_gp_poll || !cur_ops->poll_gp_state)) {
pr_alert("%s: gp_poll without primitives.\n", __func__);
}
if (gp_poll_full1 && cur_ops->start_gp_poll_full && cur_ops->poll_gp_state_full) {
if (gp_poll_full1 && cur_ops->get_comp_state_full && cur_ops->same_gp_state_full
&& cur_ops->start_gp_poll_full && cur_ops->poll_gp_state_full) {
synctype[nsynctypes++] = RTWS_POLL_GET_FULL;
pr_info("%s: Testing polling full-state GPs.\n", __func__);
} else if (gp_poll_full && (!cur_ops->start_gp_poll_full || !cur_ops->poll_gp_state_full)) {
@ -1340,9 +1345,11 @@ rcu_torture_writer(void *arg)
int expediting = 0;
unsigned long gp_snap;
struct rcu_gp_oldstate gp_snap_full;
struct rcu_gp_oldstate gp_snap1_full;
int i;
int idx;
int oldnice = task_nice(current);
struct rcu_gp_oldstate rgo[NUM_ACTIVE_RCU_POLL_FULL_OLDSTATE];
struct rcu_torture *rp;
struct rcu_torture *old_rp;
static DEFINE_TORTURE_RANDOM(rand);
@ -1472,11 +1479,23 @@ rcu_torture_writer(void *arg)
break;
case RTWS_POLL_GET_FULL:
rcu_torture_writer_state = RTWS_POLL_GET_FULL;
for (i = 0; i < ARRAY_SIZE(rgo); i++)
cur_ops->get_comp_state_full(&rgo[i]);
cur_ops->start_gp_poll_full(&gp_snap_full);
rcu_torture_writer_state = RTWS_POLL_WAIT_FULL;
while (!cur_ops->poll_gp_state_full(&gp_snap_full))
while (!cur_ops->poll_gp_state_full(&gp_snap_full)) {
cur_ops->get_gp_state_full(&gp_snap1_full);
for (i = 0; i < ARRAY_SIZE(rgo); i++)
if (cur_ops->poll_gp_state_full(&rgo[i]) ||
cur_ops->same_gp_state_full(&rgo[i],
&gp_snap1_full)) {
rgo[i] = gp_snap1_full;
break;
}
WARN_ON_ONCE(i >= ARRAY_SIZE(rgo));
torture_hrtimeout_jiffies(torture_random(&rand) % 16,
&rand);
}
rcu_torture_pipe_update(old_rp);
break;
case RTWS_POLL_GET_EXP: