rcu: Improve rcutorture diagnostics when bad torture_type specified

Make rcutorture list the available torture_type values when it
doesn't like the one specified.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Josh Triplett <josh@joshtriplett.org>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
Cc: avi@redhat.com
Cc: mtosatti@redhat.com
LKML-Reference: <12565226351868-git-send-email->
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 14480e8b2a246cb87fd92166d14e4c89a05cc7ff..3dd0ca23e1913c81f6d1a4e1cafdcf7cb31b170c 100644 (file)
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -1129,8 +1129,12 @@ rcu_torture_init(void)
                        break;
        }
        if (i == ARRAY_SIZE(torture_ops)) {
-               printk(KERN_ALERT "rcutorture: invalid torture type: \"%s\"\n",
+               printk(KERN_ALERT "rcu-torture: invalid torture type: \"%s\"\n",
                       torture_type);
+               printk(KERN_ALERT "rcu-torture types:");
+               for (i = 0; i < ARRAY_SIZE(torture_ops); i++)
+                       printk(KERN_ALERT " %s", torture_ops[i]->name);
+               printk(KERN_ALERT "\n");
                mutex_unlock(&fullstop_mutex);
                return -EINVAL;
        }