[PATCH RESEND] selftests/mm/run_vmtests.sh: skip hugevm tests if write_to_hugetlbfs is missing

[Khaled Elnaggar <khaledelnaggarlinux@gmail.com>]

The hugevm tests 'charge_reserved_hugetlb.sh' and 'hugetlb_reparenting_test.sh'
depend on the 'write_to_hugetlbfs' binary to simulate writes to hugetlbfs
while checking reservations asynchronously in the background.

When this binary is missing (e.g., excluded from the build), these tests hang
for up to 180 seconds. During this time, run_vmtests.sh is eventually killed
due to timeout, aborting all subsequent tests.

This patch skips these tests if the binary is not found, preventing delays
and ensuring that the test suite runs to completion.

Signed-off-by: Khaled Elnaggar <khaledelnaggarlinux@gmail.com>
---
 tools/testing/selftests/mm/run_vmtests.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh
index dddd1dd8af14..0b55395ee2cb 100755
--- a/tools/testing/selftests/mm/run_vmtests.sh
+++ b/tools/testing/selftests/mm/run_vmtests.sh
@@ -375,8 +375,13 @@ CATEGORY="process_mrelease" run_test ./mrelease_test
 CATEGORY="mremap" run_test ./mremap_test

 CATEGORY="hugetlb" run_test ./thuge-gen
+
+# the following tests depend on write_to_hugetlbfs binary
+if [ -x ./write_to_hugetlbfs ]; then
 CATEGORY="hugetlb" run_test ./charge_reserved_hugetlb.sh -cgroup-v2
 CATEGORY="hugetlb" run_test ./hugetlb_reparenting_test.sh -cgroup-v2
+fi
+
 if $RUN_DESTRUCTIVE; then
 nr_hugepages_tmp=$(cat /proc/sys/vm/nr_hugepages)
 enable_soft_offline=$(cat /proc/sys/vm/enable_soft_offline)
--
2.47.2