[PATCH] selftests/mm: skip khugepaged file tests if mkfs.xfs is unavailable

[Jaeyeon Lee <jaeyeon.lee.dev@gmail.com>]

The XFS setup for ./khugepaged all:file checks that the kernel supports
XFS but not that mkfs.xfs is installed. When CONFIG_XFS_FS=y and
xfsprogs is missing, mkfs.xfs and mount both fail, but
SPLIT_HUGE_PAGE_TEST_XFS_PATH is assigned from mktemp -d and stays set.
The test then runs against plain tmpfs and six subtests fail.

The script already has a skip path for this test, but it never runs
because the path variable is always set. Check that mkfs.xfs exists
before attempting the XFS setup.

Assisted-by: claude.ai:claude-opus-5
Signed-off-by: Jaeyeon Lee <jaeyeon.lee.dev@gmail.com>
---
 tools/testing/selftests/mm/run_vmtests.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh
index d09f9f6a384e..6315b67b6733 100755
--- a/tools/testing/selftests/mm/run_vmtests.sh
+++ b/tools/testing/selftests/mm/run_vmtests.sh
@@ -415,7 +415,8 @@ CATEGORY="thp" run_test ./khugepaged -c 4 mthp_khugepaged:anon
 # Try to create XFS if not provided
 if [ -z "${SPLIT_HUGE_PAGE_TEST_XFS_PATH}" ]; then
     if test_selected "thp"; then
-	if grep xfs /proc/filesystems &>/dev/null; then
+	if grep xfs /proc/filesystems &>/dev/null &&
+	   command -v mkfs.xfs &>/dev/null; then
 	    XFS_IMG=$(mktemp /tmp/xfs_img_XXXXXX)
 	    SPLIT_HUGE_PAGE_TEST_XFS_PATH=$(mktemp -d /tmp/xfs_dir_XXXXXX)
 	    truncate -s 314572800 ${XFS_IMG}
-- 
2.43.0