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>

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index f9821a3..c4cc048 100644 (file)
--- 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