[PATCH] selftests/vm: Use kselftest skip code for skipped tests

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There are several test cases in the vm directory are still using
exit 0 when they need to be skipped. Use kselftest framework skip
code instead so it can help us to distinguish the return status.

Criterion to filter out what should be fixed in vm directory:
  grep -r "exit 0" -B1 | grep -i skip

This change might cause some false-positives if people are running
these test scripts directly and only checking their return codes,
which will change from 0 to 4. However I think the impact should be
small as most of our scripts here are already using this skip code.
And there will be no such issue if running them with the kselftest
framework.

Signed-off-by: Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>
---
 tools/testing/selftests/vm/charge_reserved_hugetlb.sh  | 5 ++++-
 tools/testing/selftests/vm/hugetlb_reparenting_test.sh | 5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/vm/charge_reserved_hugetlb.sh b/tools/testing/selftests/vm/charge_reserved_hugetlb.sh
index 18d3368..fe8fcfb 100644
--- a/tools/testing/selftests/vm/charge_reserved_hugetlb.sh
+++ b/tools/testing/selftests/vm/charge_reserved_hugetlb.sh
@@ -1,11 +1,14 @@
 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 set -e
 
 if [[ $(id -u) -ne 0 ]]; then
   echo "This test must be run as root. Skipping..."
-  exit 0
+  exit $ksft_skip
 fi
 
 fault_limit_file=limit_in_bytes
diff --git a/tools/testing/selftests/vm/hugetlb_reparenting_test.sh b/tools/testing/selftests/vm/hugetlb_reparenting_test.sh
index d11d1fe..4a9a3af 100644
--- a/tools/testing/selftests/vm/hugetlb_reparenting_test.sh
+++ b/tools/testing/selftests/vm/hugetlb_reparenting_test.sh
@@ -1,11 +1,14 @@
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
 set -e
 
 if [[ $(id -u) -ne 0 ]]; then
   echo "This test must be run as root. Skipping..."
-  exit 0
+  exit $ksft_skip
 fi
 
 usage_file=usage_in_bytes
-- 
2.7.4





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