tracing: Fix compile error in module tracepoints when MODULE_UNLOAD not set

If modules are configured in the build but unloading of modules is not,
then the refcnt is not defined. Place the get/put module tracepoints
under CONFIG_MODULE_UNLOAD since it references this field in the module
structure.

As a side-effect, this patch also reduces the code when MODULE_UNLOAD
is not set, because these unused tracepoints are not created.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

2 files changed, 7 insertions, 2 deletions

diff --git a/include/trace/events/module.h b/include/trace/events/module.h
index a585f8135bd9..f07b44a2b240 100644
--- a/include/trace/events/module.h
+++ b/include/trace/events/module.h
@@ -51,6 +51,9 @@ TRACE_EVENT(module_free,
         TP_printk("%s", __get_str(name))
 );
 
+#ifdef CONFIG_MODULE_UNLOAD
+/* trace_module_get/put are only used if CONFIG_MODULE_UNLOAD is defined */
+
 DECLARE_EVENT_CLASS(module_refcnt,
 
         TP_PROTO(struct module *mod, unsigned long ip),
@@ -86,6 +89,7 @@ DEFINE_EVENT(module_refcnt, module_put,
 
         TP_ARGS(mod, ip)
 );
+#endif /* CONFIG_MODULE_UNLOAD */
 
 TRACE_EVENT(module_request,
 
diff --git a/kernel/module.c b/kernel/module.c
index 21591ad921f3..d9e237926b69 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -59,8 +59,6 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/module.h>
 
-EXPORT_TRACEPOINT_SYMBOL(module_get);
-
 #if 0
 #define DEBUGP printk
 #else
@@ -467,6 +465,9 @@ MODINFO_ATTR(srcversion);
 static char last_unloaded_module[MODULE_NAME_LEN+1];
 
 #ifdef CONFIG_MODULE_UNLOAD
+
+EXPORT_TRACEPOINT_SYMBOL(module_get);
+
 /* Init the unload section of the module. */
 static void module_unload_init(struct module *mod)
 {