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Subject[PATCH 4/5] Add call_rcu_sched() and friends to rcutorture
[Reresend, this time I promise with corrected subject: line!!!]

Add entry to rcu_torture_ops allowing the correct barrier function to
be used upon exit from rcutorture. Also add torture options for the
new call_rcu_sched() API.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
rcutorture.c | 34 +++++++++++++++++++++++++++++++---
1 file changed, 31 insertions(+), 3 deletions(-)
diff -urpNa -X dontdiff linux-2.6.25-C3-rcu_barrier_sched/kernel/rcutorture.c linux-2.6.25-C4-rcutorture/kernel/rcutorture.c
--- linux-2.6.25-C3-rcu_barrier_sched/kernel/rcutorture.c 2008-04-16 19:49:44.000000000 -0700
+++ linux-2.6.25-C4-rcutorture/kernel/rcutorture.c 2008-04-21 12:08:51.000000000 -0700
@@ -191,6 +191,7 @@ struct rcu_torture_ops {
int (*completed)(void);
void (*deferredfree)(struct rcu_torture *p);
void (*sync)(void);
+ void (*cb_barrier)(void);
int (*stats)(char *page);
char *name;
};
@@ -264,6 +265,7 @@ static struct rcu_torture_ops rcu_ops =
.completed = rcu_torture_completed,
.deferredfree = rcu_torture_deferred_free,
.sync = synchronize_rcu,
+ .cb_barrier = rcu_barrier,
.stats = NULL,
.name = "rcu"
};
@@ -303,6 +305,7 @@ static struct rcu_torture_ops rcu_sync_o
.completed = rcu_torture_completed,
.deferredfree = rcu_sync_torture_deferred_free,
.sync = synchronize_rcu,
+ .cb_barrier = NULL,
.stats = NULL,
.name = "rcu_sync"
};
@@ -363,6 +366,7 @@ static struct rcu_torture_ops rcu_bh_ops
.completed = rcu_bh_torture_completed,
.deferredfree = rcu_bh_torture_deferred_free,
.sync = rcu_bh_torture_synchronize,
+ .cb_barrier = rcu_barrier_bh,
.stats = NULL,
.name = "rcu_bh"
};
@@ -376,6 +380,7 @@ static struct rcu_torture_ops rcu_bh_syn
.completed = rcu_bh_torture_completed,
.deferredfree = rcu_sync_torture_deferred_free,
.sync = rcu_bh_torture_synchronize,
+ .cb_barrier = NULL,
.stats = NULL,
.name = "rcu_bh_sync"
};
@@ -457,6 +462,7 @@ static struct rcu_torture_ops srcu_ops =
.completed = srcu_torture_completed,
.deferredfree = rcu_sync_torture_deferred_free,
.sync = srcu_torture_synchronize,
+ .cb_barrier = NULL,
.stats = srcu_torture_stats,
.name = "srcu"
};
@@ -481,6 +487,11 @@ static int sched_torture_completed(void)
return 0;
}

+static void rcu_sched_torture_deferred_free(struct rcu_torture *p)
+{
+ call_rcu_sched(&p->rtort_rcu, rcu_torture_cb);
+}
+
static void sched_torture_synchronize(void)
{
synchronize_sched();
@@ -493,12 +504,27 @@ static struct rcu_torture_ops sched_ops
.readdelay = rcu_read_delay, /* just reuse rcu's version. */
.readunlock = sched_torture_read_unlock,
.completed = sched_torture_completed,
- .deferredfree = rcu_sync_torture_deferred_free,
+ .deferredfree = rcu_sched_torture_deferred_free,
.sync = sched_torture_synchronize,
+ .cb_barrier = rcu_barrier_sched,
.stats = NULL,
.name = "sched"
};

+static struct rcu_torture_ops sched_ops_sync = {
+ .init = rcu_sync_torture_init,
+ .cleanup = NULL,
+ .readlock = sched_torture_read_lock,
+ .readdelay = rcu_read_delay, /* just reuse rcu's version. */
+ .readunlock = sched_torture_read_unlock,
+ .completed = sched_torture_completed,
+ .deferredfree = rcu_sync_torture_deferred_free,
+ .sync = sched_torture_synchronize,
+ .cb_barrier = NULL,
+ .stats = NULL,
+ .name = "sched_sync"
+};
+
/*
* RCU torture writer kthread. Repeatedly substitutes a new structure
* for that pointed to by rcu_torture_current, freeing the old structure
@@ -844,7 +870,9 @@ rcu_torture_cleanup(void)
stats_task = NULL;

/* Wait for all RCU callbacks to fire. */
- rcu_barrier();
+
+ if (cur_ops->cb_barrier != NULL)
+ cur_ops->cb_barrier();

rcu_torture_stats_print(); /* -After- the stats thread is stopped! */

@@ -864,7 +892,7 @@ rcu_torture_init(void)
int firsterr = 0;
static struct rcu_torture_ops *torture_ops[] =
{ &rcu_ops, &rcu_sync_ops, &rcu_bh_ops, &rcu_bh_sync_ops,
- &srcu_ops, &sched_ops, };
+ &srcu_ops, &sched_ops, &sched_ops_sync, };

/* Process args and tell the world that the torturer is on the job. */
for (i = 0; i < ARRAY_SIZE(torture_ops); i++) {

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