[PATCH 2/4] rcu: Add rcu_sync torture type to rcutorture

[Josh Triplett <josht@us.ibm.com>]

Use the newly-generic synchronous deferred free function to implement torture
testing for RCU using synchronize_rcu rather than the asynchronous call_rcu.

Signed-off-by: Josh Triplett <josh@freedesktop.org>
---
 Documentation/RCU/torture.txt |    7 ++++---
 kernel/rcutorture.c           |   17 +++++++++++++++--
 2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/Documentation/RCU/torture.txt b/Documentation/RCU/torture.txt
index 2180ef9..6714b53 100644
--- a/Documentation/RCU/torture.txt
+++ b/Documentation/RCU/torture.txt
@@ -53,9 +53,10 @@ test_no_idle_hz	Whether or not to test t
 		a kernel that disables the scheduling-clock interrupt to
 		idle CPUs.  Boolean parameter, "1" to test, "0" otherwise.
 
-torture_type	The type of RCU to test: "rcu" for the rcu_read_lock()
-		API, "rcu_bh" for the rcu_read_lock_bh() API, and "srcu"
-		for the "srcu_read_lock()" API.
+torture_type	The type of RCU to test: "rcu" for the rcu_read_lock() API,
+		"rcu_sync" for rcu_read_lock() with synchronous reclamation,
+		"rcu_bh" for the rcu_read_lock_bh() API, and "srcu" for the
+		"srcu_read_lock()" API.
 
 verbose		Enable debug printk()s.  Default is disabled.
 
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 6e2f0a8..1c329df 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -58,7 +58,7 @@ static int stat_interval;	/* Interval be
 static int verbose;		/* Print more debug info. */
 static int test_no_idle_hz;	/* Test RCU's support for tickless idle CPUs. */
 static int shuffle_interval = 5; /* Interval between shuffles (in sec)*/
-static char *torture_type = "rcu"; /* What to torture: rcu, rcu_bh, srcu. */
+static char *torture_type = "rcu"; /* What RCU implementation to torture. */
 
 module_param(nreaders, int, 0);
 MODULE_PARM_DESC(nreaders, "Number of RCU reader threads");
@@ -297,6 +297,19 @@ static void rcu_sync_torture_init(void)
 	INIT_LIST_HEAD(&rcu_torture_removed);
 }
 
+static struct rcu_torture_ops rcu_sync_ops = {
+	.init = rcu_sync_torture_init,
+	.cleanup = NULL,
+	.readlock = rcu_torture_read_lock,
+	.readdelay = rcu_read_delay,
+	.readunlock = rcu_torture_read_unlock,
+	.completed = rcu_torture_completed,
+	.deferredfree = rcu_sync_torture_deferred_free,
+	.sync = synchronize_rcu,
+	.stats = NULL,
+	.name = "rcu_sync"
+};
+
 /*
  * Definitions for rcu_bh torture testing.
  */
@@ -439,7 +452,7 @@ static struct rcu_torture_ops srcu_ops =
 };
 
 static struct rcu_torture_ops *torture_ops[] =
-	{ &rcu_ops, &rcu_bh_ops, &srcu_ops, NULL };
+	{ &rcu_ops, &rcu_sync_ops, &rcu_bh_ops, &srcu_ops, NULL };
 
 /*
  * RCU torture writer kthread.  Repeatedly substitutes a new structure
-- 
1.4.1.1


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