Some C libraries may not define the ulong typedef that is commonly
available as a BSD/GNU extension. Add a fallback typedef to ensure ulong
is available across all selftest environments.

Signed-off-by: Aqib Faruqui <aqibaf@amazon.com>
---
 tools/testing/selftests/kselftest.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/kselftest.h b/tools/testing/selftests/kselftest.h
index f362c6766..a1088a2af 100644
--- a/tools/testing/selftests/kselftest.h
+++ b/tools/testing/selftests/kselftest.h
@@ -58,6 +58,11 @@
 #include <stdio.h>
 #include <sys/utsname.h>
 #include <sys/syscall.h>
+#include <sys/types.h>
+#endif
+
+#ifndef ulong
+typedef unsigned long ulong;
 #endif
 
 #ifndef ARRAY_SIZE
-- 
2.47.3