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rcutorture: Make rcu_torture_fakewriter() use blocking wait primitives

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Full testing of the new SRCU polling API requires that the fake
writers also use it in order to test concurrent calls to all of the API
members, especially start_poll_synchronize_srcu().  This commit makes
rcu_torture_fakewriter() use all available blocking grace-period-wait
primitives available from the RCU flavor under test.

Link: https://lore.kernel.org/rcu/20201112201547.GF3365678@moria.home.lan/
Reported-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-11-16 17:10:39 -08:00
parent 18fbf307b7
commit 682189a3f8
1 changed files with 32 additions and 8 deletions
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40
kernel/rcu/rcutorture.c
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@ -1289,6 +1289,8 @@ rcu_torture_writer(void *arg)
static int
rcu_torture_fakewriter(void *arg)
{
unsigned long gp_snap;
int i;
DEFINE_TORTURE_RANDOM(rand);
VERBOSE_TOROUT_STRING("rcu_torture_fakewriter task started");
@ -1300,15 +1302,37 @@ rcu_torture_fakewriter(void *arg)
if (cur_ops->cb_barrier != NULL &&
torture_random(&rand) % (nfakewriters * 8) == 0) {
cur_ops->cb_barrier();
} else if (gp_normal == gp_exp) {
if (cur_ops->sync && torture_random(&rand) & 0x80)
cur_ops->sync();
else if (cur_ops->exp_sync)
} else {
switch (synctype[torture_random(&rand) % nsynctypes]) {
case RTWS_DEF_FREE:
break;
case RTWS_EXP_SYNC:
cur_ops->exp_sync();
} else if (gp_normal && cur_ops->sync) {
cur_ops->sync();
} else if (cur_ops->exp_sync) {
cur_ops->exp_sync();
break;
case RTWS_COND_GET:
gp_snap = cur_ops->get_gp_state();
i = torture_random(&rand) % 16;
if (i != 0)
schedule_timeout_interruptible(i);
udelay(torture_random(&rand) % 1000);
cur_ops->cond_sync(gp_snap);
break;
case RTWS_POLL_GET:
gp_snap = cur_ops->start_gp_poll();
while (!cur_ops->poll_gp_state(gp_snap)) {
i = torture_random(&rand) % 16;
if (i != 0)
schedule_timeout_interruptible(i);
udelay(torture_random(&rand) % 1000);
}
break;
case RTWS_SYNC:
cur_ops->sync();
break;
default:
WARN_ON_ONCE(1);
break;
}
}
stutter_wait("rcu_torture_fakewriter");
} while (!torture_must_stop());