[PATCH v3 2/2] ftrace: don't allocate ftrace module map if ftrace is disabled

From: Ye Bin <redacted>

If the ftrace is disabled, it is meaningless to allocate module map.
So add check in allocate_ftrace_mod_map().

Signed-off-by: Ye Bin <redacted>
---
 kernel/trace/ftrace.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 4f9677141d03..b3436d86e470 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c

@@ -7633,6 +7633,9 @@ allocate_ftrace_mod_map(struct module *mod,
 {
 	struct ftrace_mod_map *mod_map;
 
+	if (ftrace_disabled)
+		return NULL;
+
 	mod_map = kmalloc(sizeof(*mod_map), GFP_KERNEL);
 	if (!mod_map)
 		return NULL;

-- 
2.34.1