[PATCH v4 1/2] tracing: Fix a compilation error without CONFIG_MODULES

[Masami Hiramatsu (Google)]

From: Masami Hiramatsu (Google) <mhira...@kernel.org>

There are some code which depends on CONFIG_MODULES. #ifdef
to enclose it.

Fixes: dca91c1c5468 ("tracing: Have persistent trace instances save module 
addresses")
Signed-off-by: Masami Hiramatsu (Google) <mhira...@kernel.org>
---
 kernel/trace/trace.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index c3c79908766e..c70b2e709987 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -6001,6 +6001,7 @@ struct trace_scratch {
 
 static DEFINE_MUTEX(scratch_mutex);
 
+#ifdef CONFIG_MODULES
 static int save_mod(struct module *mod, void *data)
 {
        struct trace_array *tr = data;
@@ -6025,6 +6026,7 @@ static int save_mod(struct module *mod, void *data)
 
        return 0;
 }
+#endif
 
 static void update_last_data(struct trace_array *tr)
 {
@@ -6040,9 +6042,10 @@ static void update_last_data(struct trace_array *tr)
                memset(tscratch->entries, 0,
                       flex_array_size(tscratch, entries, 
tscratch->nr_entries));
                tscratch->nr_entries = 0;
-
+#ifdef CONFIG_MODULES
                guard(mutex)(&scratch_mutex);
                module_for_each_mod(save_mod, tr);
+#endif
        }
 
        if (!(tr->flags & TRACE_ARRAY_FL_LAST_BOOT))