Within run_tests target, the whole script needs to be executed within
the same shell and not as separate subshells, so the initial test_num
variable set to 0 is still present when executing "test_num=`echo
$$test_num+1 | bc`;".

Demonstration of the issue (make run_tests):

TAP version 13
(standard_in) 1: syntax error
selftests: basic_test
========================================
ok 1.. selftests: basic_test [PASS]
(standard_in) 1: syntax error
selftests: basic_percpu_ops_test
========================================
ok 1.. selftests: basic_percpu_ops_test [PASS]
(standard_in) 1: syntax error
selftests: param_test
========================================
ok 1.. selftests: param_test [PASS]

With fix applied:

TAP version 13
selftests: basic_test
========================================
ok 1..1 selftests: basic_test [PASS]
selftests: basic_percpu_ops_test
========================================
ok 1..2 selftests: basic_percpu_ops_test [PASS]
selftests: param_test
========================================
ok 1..3 selftests: param_test [PASS]

Signed-off-by: Mathieu Desnoyers <mathieu.desnoy...@efficios.com>
Fixes: 1f87c7c15d7 ("selftests: lib.mk: change RUN_TESTS to print messages in 
TAP13 format")
CC: Shuah Khan <shua...@osg.samsung.com>
CC: linux-kselft...@vger.kernel.org
---
 tools/testing/selftests/lib.mk | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
index f65886af7c0c..40057215e0da 100644
--- a/tools/testing/selftests/lib.mk
+++ b/tools/testing/selftests/lib.mk
@@ -20,9 +20,9 @@ all: $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED) 
$(TEST_GEN_FILES)
 
 .ONESHELL:
 define RUN_TESTS
-       @test_num=`echo 0`;
-       @echo "TAP version 13";
-       @for TEST in $(1); do                           \
+       @test_num=`echo 0`;                             \
+       echo "TAP version 13";                          \
+       for TEST in $(1); do                            \
                BASENAME_TEST=`basename $$TEST`;        \
                test_num=`echo $$test_num+1 | bc`;      \
                echo "selftests: $$BASENAME_TEST";      \
-- 
2.11.0

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