The VALUE_IF_KUNIT macro will add expression statement only if the
CONFIG_KUNIT is enabled. Otherwise if CONFIG_KUNIT is not enabled
it will evaluate always to 0.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
---
Cc: Rae Moar <rmoar@xxxxxxxxxx>
Cc: David Gow <davidgow@xxxxxxxxxx>
Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
---
v2: add simple usage example (Rae)
reformat kernel-doc for better output (Michal)
s/ONLY_IF_KUNIT/VALUE_IF_KUNIT
---
include/kunit/visibility.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/include/kunit/visibility.h b/include/kunit/visibility.h
index c1825381adfc..b156cafa4705 100644
--- a/include/kunit/visibility.h
+++ b/include/kunit/visibility.h
@@ -30,6 +30,25 @@
*/
#define DECLARE_IF_KUNIT(body...) body
+ /**
+ * VALUE_IF_KUNIT - Conditionally evaluate an expression
+ * @expr: the expression to be evaluated conditionally
+ *
+ * This macro evaluates expression statement only if CONFIG_KUNIT is enabled.
+ * Otherwise if CONFIG_KUNIT is not enabled it will evaluate always to 0.
+ *
+ * .. code-block:: C
+ *
+ * int real_func(int i)
+ * {
+ * if (VALUE_IF_KUNIT(i == 0xC0FFE))
+ * return 0;
+ *
+ * return i + 1;
+ * }
+ */
+ #define VALUE_IF_KUNIT(expr...) expr
+
/**
* VISIBLE_IF_KUNIT - A macro that sets symbols to be static if
* CONFIG_KUNIT is not enabled. Otherwise if CONFIG_KUNIT is enabled
@@ -46,6 +65,7 @@
EXPORTED_FOR_KUNIT_TESTING)
#else
#define DECLARE_IF_KUNIT(body...)
+ #define VALUE_IF_KUNIT(expr...) 0
#define VISIBLE_IF_KUNIT static
#define EXPORT_SYMBOL_IF_KUNIT(symbol)
#endif
--
2.43.0
