The kselftest harness uses pidfd_open() for test timeout handling but
may not have access to the syscall definitions in non-glibc
environments. Include pidfd.h to ensure the syscall numbers are
available.

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

diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
index 2925e47db..1dd3e5a1b 100644
--- a/tools/testing/selftests/kselftest_harness.h
+++ b/tools/testing/selftests/kselftest_harness.h
@@ -69,6 +69,7 @@
 #include <unistd.h>
 
 #include "kselftest.h"
+#include "pidfd/pidfd.h"
 
 #define TEST_TIMEOUT_DEFAULT 30
 
-- 
2.47.3