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authorPeter Zijlstra <peterz@infradead.org>2020-08-18 15:57:46 +0200
committerIngo Molnar <mingo@kernel.org>2020-09-01 09:58:05 +0200
commitf03c412915f5f69f2d17bcd20ecdd69320bcbf7b (patch)
tree7fdddaec7635ff18cfb0c956ce2b600865c7ca37 /kernel/static_call.c
parent1e7e47883830aae5e8246a22ca2fc6883c61acdf (diff)
static_call: Add simple self-test for static calls
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20200818135804.922581202@infradead.org
Diffstat (limited to 'kernel/static_call.c')
-rw-r--r--kernel/static_call.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/kernel/static_call.c b/kernel/static_call.c
index 753b2f1b4fb8..97142cb6bfa6 100644
--- a/kernel/static_call.c
+++ b/kernel/static_call.c
@@ -369,3 +369,46 @@ static void __init static_call_init(void)
#endif
}
early_initcall(static_call_init);
+
+#ifdef CONFIG_STATIC_CALL_SELFTEST
+
+static int func_a(int x)
+{
+ return x+1;
+}
+
+static int func_b(int x)
+{
+ return x+2;
+}
+
+DEFINE_STATIC_CALL(sc_selftest, func_a);
+
+static struct static_call_data {
+ int (*func)(int);
+ int val;
+ int expect;
+} static_call_data [] __initdata = {
+ { NULL, 2, 3 },
+ { func_b, 2, 4 },
+ { func_a, 2, 3 }
+};
+
+static int __init test_static_call_init(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(static_call_data); i++ ) {
+ struct static_call_data *scd = &static_call_data[i];
+
+ if (scd->func)
+ static_call_update(sc_selftest, scd->func);
+
+ WARN_ON(static_call(sc_selftest)(scd->val) != scd->expect);
+ }
+
+ return 0;
+}
+early_initcall(test_static_call_init);
+
+#endif /* CONFIG_STATIC_CALL_SELFTEST */