ftrace: Simplify ftrace hash lookup code in clear_func_from_hash()

Function ftrace_lookup_ip() will check empty hash table. So we don't
need extra check outside.

Link: http://lkml.kernel.org/r/20190910143336.13472-1-changbin.du@gmail.com

Signed-off-by: Changbin Du <changbin.du@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

1 files changed, 1 insertions, 5 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index f9821a3374e9..c4cc048eb594 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -6036,11 +6036,7 @@ clear_func_from_hash(struct ftrace_init_func *func, struct ftrace_hash *hash)
 {
         struct ftrace_func_entry *entry;
 
-        if (ftrace_hash_empty(hash))
-                return;
-
-        entry = __ftrace_lookup_ip(hash, func->ip);
-
+        entry = ftrace_lookup_ip(hash, func->ip);
         /*
          * Do not allow this rec to match again.
          * Yeah, it may waste some memory, but will be removed