+ selftests-mm-track-the-modules-run_vmtestssh-loads.patch added to mm-new branch

+ selftests-mm-track-the-modules-run_vmtestssh-loads.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: selftests/mm: track the modules run_vmtests.sh loads
has been added to the -mm mm-new branch.  Its filename is
     selftests-mm-track-the-modules-run_vmtestssh-loads.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-track-the-modules-run_vmtestssh-loads.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: track the modules run_vmtests.sh loads
Date: Thu, 29 Oct 2026 02:24:35 -0400

Patch series "selftests/mm: run the XFS-backed THP tests when xfs is a
module", v3.

run_vmtests.sh only creates the XFS that "khugepaged all:file" and the
pagecache folio split cases of split_huge_page_test need when xfs is
already registered, so with xfs built as a module and not loaded yet
those tests are all skipped.

Patch 1 adds load_module(), which records the modules the script loads
and unloads them again before it exits, and moves hwpoison_inject over
to it. Patch 2 loads xfs through it.


This patch (of 2):

run_vmtests.sh loads hwpoison_inject for the memory-failure test when it
is not there yet, remembers that in a variable local to run_test() and
unloads the module right after the test.

The thp tests need xfs loaded in the same way, and repeating the load,
the bookkeeping and the unload for every module that some test needs
does not scale.

Add load_module(), which loads a module unless it is already present
and records it, and unload every recorded module, in reverse order,
before the script exits. Use it for hwpoison_inject.

Link: https://lore.kernel.org/20261029-bug-selftests-mm-run-vmtests-xfs-modprobe-v3-0-16ad772850ee@gmail.com
Link: https://lore.kernel.org/20261029-bug-selftests-mm-run-vmtests-xfs-modprobe-v3-1-16ad772850ee@gmail.com
Signed-off-by: Qiliang Yuan <odys.yuan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Jose A. Perez de Azpillaga <azpijr@gmail.com>
Reviewed-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 |   31 ++++++++++++++------
 1 file changed, 23 insertions(+), 8 deletions(-)

--- a/tools/testing/selftests/mm/run_vmtests.sh~selftests-mm-track-the-modules-run_vmtestssh-loads
+++ a/tools/testing/selftests/mm/run_vmtests.sh
@@ -171,11 +171,30 @@ pretty_name() {
 	echo "$*" | sed -e 's/^\(bash \)\?\.\///'
 }
 
+# Modules this script loaded, unloaded again before it exits
+LOADED_MODULES=()
+
+# Usage: load_module [module]
+load_module() {
+	if [ -d "/sys/module/$1" ]; then
+		return 0
+	fi
+	modprobe -q "$1" || return 1
+	LOADED_MODULES+=("$1")
+}
+
+unload_modules() {
+	local i
+
+	for (( i = ${#LOADED_MODULES[@]} - 1; i >= 0; i-- )); do
+		modprobe -r -q "${LOADED_MODULES[i]}"
+	done
+}
+
 # Usage: run_test [test binary] [arbitrary test arguments...]
 run_test() {
 	if test_selected ${CATEGORY}; then
 		local skip=0
-		local LOADED_HWPOISON_INJECT_MOD=0
 
 		# On memory constrainted systems some tests can fail to allocate hugepages.
 		# perform some cleanup before the test for a higher success rate.
@@ -201,8 +220,7 @@ run_test() {
 						| tap_prefix
 					skip=1
 				else
-					modprobe hwpoison_inject > /dev/null 2>&1
-					LOADED_HWPOISON_INJECT_MOD=1
+					load_module hwpoison_inject
 					if [ ! -d "$HWPOISON_DIR" ]; then
 						echo "hwpoison debugfs interface not present" \
 							| tap_prefix
@@ -225,11 +243,6 @@ run_test() {
 			local ret=${PIPESTATUS[0]}
 		fi
 
-		# Unload hwpoison_inject if we loaded it
-		if [ "${LOADED_HWPOISON_INJECT_MOD}" = "1" ]; then
-			modprobe -r hwpoison_inject > /dev/null 2>&1
-		fi
-
 		count_total=$(( count_total + 1 ))
 		if [ $ret -eq 0 ]; then
 			count_pass=$(( count_pass + 1 ))
@@ -453,4 +466,6 @@ CATEGORY="memory-failure" run_test ./mem
 echo "SUMMARY: PASS=${count_pass} SKIP=${count_skip} FAIL=${count_fail}" | tap_prefix
 echo "1..${count_total}" | tap_output
 
+unload_modules
+
 exit $exitcode
_

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