The patch titled Subject: selftests/mm: restore number of hugepages has been added to the -mm mm-hotfixes-unstable branch. Its filename is selftests-mm-restore-number-of-hugepages.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-restore-number-of-hugepages.patch This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Breno Leitao <leitao@xxxxxxxxxx> Subject: selftests/mm: restore number of hugepages Date: Fri, 3 Nov 2023 10:33:59 -0700 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. Link: https://lkml.kernel.org/r/20231103173400.1608403-1-leitao@xxxxxxxxxx Fixes: 116d57303a05 ("selftests/mm: add a new test for madv and hugetlb") Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx> Reported-by: Ryan Roberts <ryan.roberts@xxxxxxx> Closes: https://lore.kernel.org/all/662df57e-47f1-4c15-9b84-f2f2d587fc5c@xxxxxxx/ Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- tools/testing/selftests/mm/run_vmtests.sh | 3 +++ 1 file changed, 3 insertions(+) --- a/tools/testing/selftests/mm/run_vmtests.sh~selftests-mm-restore-number-of-hugepages +++ a/tools/testing/selftests/mm/run_vmtests.sh @@ -223,9 +223,12 @@ CATEGORY="hugetlb" run_test ./hugepage-m 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" _ Patches currently in -mm which might be from leitao@xxxxxxxxxx are selftests-mm-restore-number-of-hugepages.patch selftests-mm-add-hugetlb_fault_after_madv-to-gitignore.patch