SUNRPC: Ensure that we can trace waitqueues when !defined(CONFIG_SYSCTL)

The tracepoint code relies on the queue->name being defined in order to
be able to display the name of the waitqueue on which an RPC task is
sleeping.

Reported-by: Randy Dunlap <rdunlap@xenotime.net>
Reported-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>

2 files changed, 16 insertions, 2 deletions

diff --git a/include/linux/sunrpc/debug.h b/include/linux/sunrpc/debug.h
index c2786f20016..2a11eb278f6 100644
--- a/include/linux/sunrpc/debug.h
+++ b/include/linux/sunrpc/debug.h
@@ -34,6 +34,9 @@
 #ifdef CONFIG_SYSCTL
 #define  RPC_DEBUG
 #endif
+#ifdef CONFIG_TRACEPOINTS
+#define RPC_TRACEPOINTS
+#endif
 /* #define  RPC_PROFILE */
 
 /*
diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
index f7b2df5252b..22dfc24013b 100644
--- a/include/linux/sunrpc/sched.h
+++ b/include/linux/sunrpc/sched.h
@@ -195,7 +195,7 @@ struct rpc_wait_queue {
         unsigned char           nr;                     /* # tasks remaining for cookie */
         unsigned short          qlen;                   /* total # tasks waiting in queue */
         struct rpc_timer        timer_list;
-#ifdef RPC_DEBUG
+#if defined(RPC_DEBUG) || defined(RPC_TRACEPOINTS)
         const char *            name;
 #endif
 };
@@ -270,11 +270,22 @@ static inline int rpc_task_has_priority(struct rpc_task *task, unsigned char pri
         return (task->tk_priority + RPC_PRIORITY_LOW == prio);
 }
 
-#ifdef RPC_DEBUG
+#if defined(RPC_DEBUG) || defined (RPC_TRACEPOINTS)
 static inline const char * rpc_qname(const struct rpc_wait_queue *q)
 {
         return ((q && q->name) ? q->name : "unknown");
 }
+
+static inline void rpc_assign_waitqueue_name(struct rpc_wait_queue *q,
+                const char *name)
+{
+        q->name = name;
+}
+#else
+static inline void rpc_assign_waitqueue_name(struct rpc_wait_queue *q,
+                const char *name)
+{
+}
 #endif
 
 #endif /* _LINUX_SUNRPC_SCHED_H_ */