The patch titled Subject: selftests/mm: uffd-unit-test check if huge page size is 0 has been added to the -mm mm-hotfixes-unstable branch. Its filename is selftests-mm-uffd-unit-test-check-if-huge-page-size-is-0.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

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

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------------------------------------------------------ From: Terry Tritton terry.tritton@linaro.org Subject: selftests/mm: uffd-unit-test check if huge page size is 0 Date: Mon, 5 Feb 2024 14:50:56 +0000

If HUGETLBFS is not enabled then the default_huge_page_size function will return 0 and cause a divide by 0 error. Add a check to see if the huge page size is 0 and skip the hugetlb tests if it is.

Link: https://lkml.kernel.org/r/20240205145055.3545806-2-terry.tritton@linaro.org Fixes: 16a45b57cbf2 ("selftests/mm: add framework for uffd-unit-test") Signed-off-by: Terry Tritton terry.tritton@linaro.org Cc: Peter Griffin peter.griffin@linaro.org Cc: Shuah Khan shuah@kernel.org Cc: Peter Xu peterx@redhat.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

tools/testing/selftests/mm/uffd-unit-tests.c | 6 ++++++ 1 file changed, 6 insertions(+)

--- a/tools/testing/selftests/mm/uffd-unit-tests.c~selftests-mm-uffd-unit-test-check-if-huge-page-size-is-0 +++ a/tools/testing/selftests/mm/uffd-unit-tests.c @@ -1517,6 +1517,12 @@ int main(int argc, char *argv[]) continue;

uffd_test_start("%s on %s", test->name, mem_type->name); + if ((mem_type->mem_flag == MEM_HUGETLB || + mem_type->mem_flag == MEM_HUGETLB_PRIVATE) && + (default_huge_page_size() == 0)) { + uffd_test_skip("huge page size is 0, feature missing?"); + continue; + } if (!uffd_feature_supported(test)) { uffd_test_skip("feature missing"); continue; _

Patches currently in -mm which might be from terry.tritton@linaro.org are

selftests-mm-uffd-unit-test-check-if-huge-page-size-is-0.patch