Speed up the case where kunit_fail_current_test() is called when no test
is running. This should make it convenient for code to call this
unconditionally in some error paths, without fear of causing a
performance problem.
If CONFIG_KUNIT=n, this compiles away to nothing. If CONFIG_KUNIT=y, it
will compile down to a NOP (on most architectures) if no KUnit test is
currently running. kunit_fail_current_test() does not work if KUnit
itself is built as a module, though this is a pre-existing limitation.
Note that the definition of kunit_fail_current_test() still wraps an
empty, inline function if KUnit is not built-in. This is to ensure that
the printf format string __attribute__ will still work.
Signed-off-by: David Gow <davidgow@xxxxxxxxxx>
---
include/kunit/test-bug.h | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)
diff --git a/include/kunit/test-bug.h b/include/kunit/test-bug.h
index 5fc58081d511..ba9558a9f9c0 100644
--- a/include/kunit/test-bug.h
+++ b/include/kunit/test-bug.h
@@ -9,16 +9,29 @@
#ifndef _KUNIT_TEST_BUG_H
#define _KUNIT_TEST_BUG_H
-#define kunit_fail_current_test(fmt, ...) \
- __kunit_fail_current_test(__FILE__, __LINE__, fmt, ##__VA_ARGS__)
-
#if IS_BUILTIN(CONFIG_KUNIT)
+#include <linux/jump_label.h> /* For static branch */
+
+/* Static key if KUnit is running any tests. */
+extern struct static_key_false kunit_running;
+
+#define kunit_fail_current_test(fmt, ...) do { \
+ if (static_branch_unlikely(&kunit_running)) { \
+ __kunit_fail_current_test(__FILE__, __LINE__, \
+ fmt, ##__VA_ARGS__); \
+ } while (0)
+
+
extern __printf(3, 4) void __kunit_fail_current_test(const char *file, int line,
const char *fmt, ...);
#else
+/* We define this with an empty helper function so format string warnings work */
+#define kunit_fail_current_test(fmt, ...) \
+ __kunit_fail_current_test(__FILE__, __LINE__, fmt, ##__VA_ARGS__)
+
static inline __printf(3, 4) void __kunit_fail_current_test(const char *file, int line,
const char *fmt, ...)
{
--
2.38.0.135.g90850a2211-goog
