Merge git://www.linux-watchdog.org/linux-watchdog

[deliverable/linux.git] / kernel / jump_label.c

diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index 8fd00d892286261b75ff3a9b55d1ae69e833e376..f7dd15d537f9b1135eb01036bf2fa3a5594ed9b6 100644 (file)
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -482,4 +482,41 @@ static void jump_label_update(struct static_key *key)
                __jump_label_update(key, entry, stop);
 }
 
-#endif
+#ifdef CONFIG_STATIC_KEYS_SELFTEST
+static DEFINE_STATIC_KEY_TRUE(sk_true);
+static DEFINE_STATIC_KEY_FALSE(sk_false);
+
+static __init int jump_label_test(void)
+{
+       int i;
+
+       for (i = 0; i < 2; i++) {
+               WARN_ON(static_key_enabled(&sk_true.key) != true);
+               WARN_ON(static_key_enabled(&sk_false.key) != false);
+
+               WARN_ON(!static_branch_likely(&sk_true));
+               WARN_ON(!static_branch_unlikely(&sk_true));
+               WARN_ON(static_branch_likely(&sk_false));
+               WARN_ON(static_branch_unlikely(&sk_false));
+
+               static_branch_disable(&sk_true);
+               static_branch_enable(&sk_false);
+
+               WARN_ON(static_key_enabled(&sk_true.key) == true);
+               WARN_ON(static_key_enabled(&sk_false.key) == false);
+
+               WARN_ON(static_branch_likely(&sk_true));
+               WARN_ON(static_branch_unlikely(&sk_true));
+               WARN_ON(!static_branch_likely(&sk_false));
+               WARN_ON(!static_branch_unlikely(&sk_false));
+
+               static_branch_enable(&sk_true);
+               static_branch_disable(&sk_false);
+       }
+
+       return 0;
+}
+late_initcall(jump_label_test);
+#endif /* STATIC_KEYS_SELFTEST */
+
+#endif /* HAVE_JUMP_LABEL */