+ selftests-mm-load-xfs-before-checking-for-it-in-run_vmtestssh.patch added to mm-new branch

+ selftests-mm-load-xfs-before-checking-for-it-in-run_vmtestssh.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: selftests/mm: load xfs before checking for it in run_vmtests.sh
has been added to the -mm mm-new branch.  Its filename is
     selftests-mm-load-xfs-before-checking-for-it-in-run_vmtestssh.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-load-xfs-before-checking-for-it-in-run_vmtestssh.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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------------------------------------------------------
From: Qiliang Yuan <odys.yuan@gmail.com>
Subject: selftests/mm: load xfs before checking for it in run_vmtests.sh
Date: Thu, 29 Oct 2026 02:24:36 -0400

run_vmtests.sh creates a loop-mounted XFS for "khugepaged all:file" and
for the pagecache folio split cases of split_huge_page_test, since
tmpfs does not give them large pagecache folios.

It only does so when xfs already shows up in /proc/filesystems. When
xfs is built as a module that is not loaded yet, the check fails, no
XFS is created, "khugepaged all:file" is reported as skipped and every
pagecache folio split case of split_huge_page_test is skipped with "No
large pagecache folio generated".

Load xfs with load_module() when it is not registered yet, so that it
is unloaded again once the script is done. Match xfs as a whole word,
as "selinuxfs" contains it too, as does "vxfs" on kernels before 7.3,
and would otherwise skip the load and leave xfs to be loaded by
mount(). "run_vmtests.sh -t thp" with xfs built as a module and not
loaded:

                                        before    after
  khugepaged all:file                  skipped      run
  skipped split_huge_page_test cases        43        0
  xfs loaded after the run                  no       no
  xfs loaded after the run, with
  selinuxfs or vxfs registered             yes       no

Link: https://lore.kernel.org/20261029-bug-selftests-mm-run-vmtests-xfs-modprobe-v3-2-16ad772850ee@gmail.com
Fixes: fc4d182316bd ("mm: huge_memory: enable debugfs to split huge pages to any order")
Signed-off-by: Qiliang Yuan <odys.yuan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Jose A. Perez de Azpillaga <azpijr@gmail.com>
Tested-by: Jose A. Perez de Azpillaga <azpijr@gmail.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
---

 tools/testing/selftests/mm/run_vmtests.sh |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/testing/selftests/mm/run_vmtests.sh~selftests-mm-load-xfs-before-checking-for-it-in-run_vmtestssh
+++ a/tools/testing/selftests/mm/run_vmtests.sh
@@ -412,7 +412,7 @@ CATEGORY="thp" run_test ./khugepaged -s
 # Try to create XFS if not provided
 if [ -z "${SPLIT_HUGE_PAGE_TEST_XFS_PATH}" ]; then
     if test_selected "thp"; then
-	if grep xfs /proc/filesystems &>/dev/null; then
+	if grep -qw xfs /proc/filesystems || load_module xfs; then
 	    XFS_IMG=$(mktemp /tmp/xfs_img_XXXXXX)
 	    XFS_DIR=$(mktemp -d /tmp/xfs_dir_XXXXXX)
 	    truncate -s 314572800 ${XFS_IMG}
_

Patches currently in -mm which might be from odys.yuan@gmail.com are

selftests-mm-track-the-modules-run_vmtestssh-loads.patch
selftests-mm-load-xfs-before-checking-for-it-in-run_vmtestssh.patch