Introduce environment variable KSFT_TAP_LEVEL to avoid printing
nested TAP headers for each test. run_tests target prints
TAP header before invoking the test program or test script. Tests
need a way to suppress TAP headers if it is already printed out.

This new environment variable adds a way for ksft_print_header()
print TAP header only when KSFT_TAP_LEVEL isn't set. run_tests and test program should print TAP header and set
KSFT_TAP_LEVEL to avoid a second TAP header to be printed.

selftests Makefile should export KSFT_TAP_LEVEL and add TAP Header
echo to the script from emit_tests target handling.

Signed-off-by: Shuah Khan <>
 tools/testing/selftests/kselftest.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kselftest.h 
index 1a52b03962a3..1b9d8ecdebce 100644
--- a/tools/testing/selftests/kselftest.h
+++ b/tools/testing/selftests/kselftest.h
@@ -57,7 +57,8 @@ static inline int ksft_get_error_cnt(void) { return 
ksft_cnt.ksft_error; }
 static inline void ksft_print_header(void)
-       printf("TAP version 13\n");
+       if (!(getenv("KSFT_TAP_LEVEL")))
+               printf("TAP version 13\n");
 static inline void ksft_print_cnts(void)

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