[PATCH] selftests/mm: uffd-unit-test check if huge page size is 0

[Terry Tritton]

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.

Signed-off-by: Terry Tritton <terry.trit...@linaro.org>
---
 tools/testing/selftests/mm/uffd-unit-tests.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c 
b/tools/testing/selftests/mm/uffd-unit-tests.c
index cce90a10515a..2b9f8cc52639 100644
--- a/tools/testing/selftests/mm/uffd-unit-tests.c
+++ b/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;
-- 
2.43.0.594.gd9cf4e227d-goog