locking/static_keys: Add selftest
Add a little selftest that validates all combinations.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index 8fd00d8..f7dd15d 100644
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -482,4 +482,41 @@
__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 */