[PATCH 2/4] kunit: Add macro to conditionally expose declarations to tests

[Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>]

The DECLARE_IF_KUNIT macro will introduces identifiers only if
CONFIG_KUNIT is enabled. Otherwise if CONFIG_KUNIT is not enabled
no identifiers from the param list will be defined.

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>
---
 include/kunit/visibility.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/kunit/visibility.h b/include/kunit/visibility.h
index 0dfe35feeec6..1c23773f826c 100644
--- a/include/kunit/visibility.h
+++ b/include/kunit/visibility.h
@@ -11,6 +11,13 @@
 #define _KUNIT_VISIBILITY_H
 
 #if IS_ENABLED(CONFIG_KUNIT)
+    /**
+     * DECLARE_IF_KUNIT - A macro that introduces identifiers only if
+     * CONFIG_KUNIT is enabled. Otherwise if CONFIG_KUNIT is not enabled
+     * no identifiers will be defined.
+     * @body: identifiers to be introduced conditionally
+     */
+    #define DECLARE_IF_KUNIT(body...)	body
     /**
      * VISIBLE_IF_KUNIT - A macro that sets symbols to be static if
      * CONFIG_KUNIT is not enabled. Otherwise if CONFIG_KUNIT is enabled
@@ -26,6 +33,7 @@
     #define EXPORT_SYMBOL_IF_KUNIT(symbol) EXPORT_SYMBOL_NS(symbol, \
 	    EXPORTED_FOR_KUNIT_TESTING)
 #else
+    #define DECLARE_IF_KUNIT(body...)
     #define VISIBLE_IF_KUNIT static
     #define EXPORT_SYMBOL_IF_KUNIT(symbol)
 #endif
-- 
2.43.0