[PATCH] rcutorture: add call_rcu_bh() operations

Add operations for the call_rcu_bh() variant of RCU.  Also add an
rcu_batches_completed_bh() function, which is needed by rcutorture.

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

1 files changed, 38 insertions, 2 deletions

diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index c96b5edd6ed1..4d1c3d247127 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -66,7 +66,7 @@ MODULE_PARM_DESC(test_no_idle_hz, "Test support for tickless idle CPUs");
 module_param(shuffle_interval, int, 0);
 MODULE_PARM_DESC(shuffle_interval, "Number of seconds between shuffles");
 module_param(torture_type, charp, 0);
-MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu)");
+MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh)");
 
 #define TORTURE_FLAG "-torture:"
 #define PRINTK_STRING(s) \
@@ -246,8 +246,44 @@ static struct rcu_torture_ops rcu_ops = {
         .name = "rcu"
 };
 
+/*
+ * Definitions for rcu_bh torture testing.
+ */
+
+static int rcu_bh_torture_read_lock(void)
+{
+        rcu_read_lock_bh();
+        return 0;
+}
+
+static void rcu_bh_torture_read_unlock(int idx)
+{
+        rcu_read_unlock_bh();
+}
+
+static int rcu_bh_torture_completed(void)
+{
+        return rcu_batches_completed_bh();
+}
+
+static void rcu_bh_torture_deferred_free(struct rcu_torture *p)
+{
+        call_rcu_bh(&p->rtort_rcu, rcu_torture_cb);
+}
+
+static struct rcu_torture_ops rcu_bh_ops = {
+        .init = NULL,
+        .cleanup = NULL,
+        .readlock = rcu_bh_torture_read_lock,
+        .readunlock = rcu_bh_torture_read_unlock,
+        .completed = rcu_bh_torture_completed,
+        .deferredfree = rcu_bh_torture_deferred_free,
+        .stats = NULL,
+        .name = "rcu_bh"
+};
+
 static struct rcu_torture_ops *torture_ops[] =
-        { &rcu_ops, NULL };
+        { &rcu_ops, &rcu_bh_ops, NULL };
 
 /*
  * RCU torture writer kthread.  Repeatedly substitutes a new structure