[PATCH 2/2] ftrace: don't allocate ftrace module map

[Ye Bin]

From: Ye Bin <yebi...@huawei.com>

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

Signed-off-by: Ye Bin <yebi...@huawei.com>
---
 kernel/trace/ftrace.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index ff5d9d73a4a7..56adf45de92e 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -7824,6 +7824,11 @@ void ftrace_free_mem(struct module *mod, void 
*start_ptr, void *end_ptr)
 
        mutex_lock(&ftrace_lock);
 
+       if (ftrace_disabled || (mod && !mod->num_ftrace_callsites)) {
+               mutex_unlock(&ftrace_lock);
+               return;
+       }
+
        /*
         * If we are freeing module init memory, then check if
         * any tracer is active. If so, we need to save a mapping of
-- 
2.34.1