[PATCH v2] selftests/mm: emit KTAP output from ksft_kmemleak_dedup

ksft_kmemleak_dedup.sh reports its result with raw "SKIP:"/"FAIL:"/"PASS:"
echoes and bare exit codes instead of KTAP, so parse_kselftest.py cannot
read it.  Convert it to the ktap_helpers.sh API, like its sibling
ksft_kmemleak_confirm.sh.

skip() and fail() emit ktap_test_skip()/ktap_test_fail() instead of
ktap_skip_all()/ktap_exit_fail_msg(), and a single ktap_set_plan() at the
top covers every path; ktap_finished() then prints the totals line and
provides the exit code for skip/fail/pass alike.

Acked-by: Mike Rapoport (Microsoft) <[email protected]>
Reviewed-by: Breno Leitao <[email protected]>
Signed-off-by: Song Hu <[email protected]>
---

Changes in v2, per review feedback from Usama Anjum:
- use ktap_test_skip() instead of ktap_skip_all(), and ktap_test_fail()
  instead of ktap_exit_fail_msg()
- move ktap_set_plan() to the very start so it covers all paths
- call ktap_finished() on the skip and fail paths as well

v1: https://lore.kernel.org/all/[email protected]/
 .../selftests/mm/ksft_kmemleak_dedup.sh       | 21 ++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/tools/testing/selftests/mm/ksft_kmemleak_dedup.sh b/tools/testing/selftests/mm/ksft_kmemleak_dedup.sh
index d01950244490..fda6a9340e0e 100755
--- a/tools/testing/selftests/mm/ksft_kmemleak_dedup.sh
+++ b/tools/testing/selftests/mm/ksft_kmemleak_dedup.sh
@@ -19,24 +19,31 @@
 #
 # Author: Breno Leitao <[email protected]>
 
-ksft_skip=4
+# KTAP output helpers (ktap_test_pass, ktap_test_skip, ktap_test_fail, ...).
+DIR="$(dirname "$(readlink -f "$0")")"
+# shellcheck source=../kselftest/ktap_helpers.sh
+source "${DIR}"/../kselftest/ktap_helpers.sh
+
 KMEMLEAK=/sys/kernel/debug/kmemleak
 VERBOSE_PARAM=/sys/module/kmemleak/parameters/verbose
 MODULE=kmemleak-test
 
+ktap_print_header
+ktap_set_plan 1
+
 skip() {
-	echo "SKIP: $*"
-	exit $ksft_skip
+	ktap_test_skip "$*"
+	ktap_finished
 }
 
 fail() {
-	echo "FAIL: $*"
-	exit 1
+	ktap_test_fail "$*"
+	ktap_finished
 }
 
 pass() {
-	echo "PASS: $*"
-	exit 0
+	ktap_test_pass "$*"
+	ktap_finished
 }
 
 [ "$(id -u)" -eq 0 ] || skip "must run as root"
-- 
2.43.0