static keys: Inline the static_key_enabled() function

In the jump label enabled case, calling static_key_enabled()
results in a function call. The function returns the results of
a compare, so it really doesn't need the overhead of a full
function call. Let's make it 'static inline' for both the jump
label enabled and disabled cases.

Signed-off-by: Jason Baron <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: Andrew Morton <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Ingo Molnar <[e-mail]>

include/linux/jump_label.h

···
 extern void static_key_slow_inc(struct static_key *key);
 extern void static_key_slow_dec(struct static_key *key);
 extern void static_key_slow_dec_deferred(struct static_key_deferred *key);
-extern bool static_key_enabled(struct static_key *key);
 extern void jump_label_apply_nops(struct module *mod);
 extern void
 jump_label_rate_limit(struct static_key_deferred *key, unsigned long rl);
···
 static inline void jump_label_lock(void) {}
 static inline void jump_label_unlock(void) {}
 
-static inline bool static_key_enabled(struct static_key *key)
-{
-	return (atomic_read(&key->enabled) > 0);
-}
-
 static inline int jump_label_apply_nops(struct module *mod)
 {
 	return 0;
···
 
 #define STATIC_KEY_INIT STATIC_KEY_INIT_FALSE
 #define jump_label_enabled static_key_enabled
+
+static inline bool static_key_enabled(struct static_key *key)
+{
+	return (atomic_read(&key->enabled) > 0);
+}
 
 #endif	/* _LINUX_JUMP_LABEL_H */

kernel/jump_label.c

···
 	mutex_unlock(&jump_label_mutex);
 }
 
-bool static_key_enabled(struct static_key *key)
-{
-	return (atomic_read(&key->enabled) > 0);
-}
-EXPORT_SYMBOL_GPL(static_key_enabled);
-
 static int jump_label_cmp(const void *a, const void *b)
 {
 	const struct jump_entry *jea = a;