The test mm `hugetlb_fault_after_madv` selftest needs one and only one huge page to run, thus it sets `/proc/sys/vm/nr_hugepages` to 1.

The problem is that further tests require the previous number of hugepages allocated in order to succeed.

Save the number of huge pages before changing it, and restore it once the test finishes, so, further tests could run successfully.

Fixes: 116d57303a05 ("selftests/mm: add a new test for madv and hugetlb") Reported-by: Ryan Roberts ryan.roberts@arm.com Closes: https://lore.kernel.org/all/662df57e-47f1-4c15-9b84-f2f2d587fc5c@arm.com/ Signed-off-by: Breno Leitao leitao@debian.org --- tools/testing/selftests/mm/run_vmtests.sh | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh index cc16f6ca8533..00757445278e 100755 --- a/tools/testing/selftests/mm/run_vmtests.sh +++ b/tools/testing/selftests/mm/run_vmtests.sh @@ -223,9 +223,12 @@ CATEGORY="hugetlb" run_test ./hugepage-mremap CATEGORY="hugetlb" run_test ./hugepage-vmemmap CATEGORY="hugetlb" run_test ./hugetlb-madvise

+nr_hugepages_tmp=$(cat /proc/sys/vm/nr_hugepages) # For this test, we need one and just one huge page echo 1 > /proc/sys/vm/nr_hugepages CATEGORY="hugetlb" run_test ./hugetlb_fault_after_madv +# Restore the previous number of huge pages, since further tests rely on it +echo "$nr_hugepages_tmp" > /proc/sys/vm/nr_hugepages

if test_selected "hugetlb"; then echo "NOTE: These hugetlb tests provide minimal coverage. Use"