[PATCH] rcu: add rcu_sync torture type to rcutorture

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>
Acked-by: Paul E. McKenney <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 19 insertions, 5 deletions

diff --git a/Documentation/RCU/torture.txt b/Documentation/RCU/torture.txt
index 2180ef93accc..6714b5361158 100644
--- a/Documentation/RCU/torture.txt
+++ b/Documentation/RCU/torture.txt
@@ -53,9 +53,10 @@ test_no_idle_hz	Whether or not to test the ability of RCU to operate in
                 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 6e2f0a8344c2..1c329df60bcc 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -58,7 +58,7 @@ static int stat_interval;	/* Interval between stats, in seconds. */
 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