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

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Message-ID: <20240205145055.3545806-2-terry.tritton@linaro.org>
Date: Mon,  5 Feb 2024 14:50:56 +0000
From: Terry Tritton <terry.tritton@...aro.org>
To: akpm@...ux-foundation.org,
	shuah@...nel.org
Cc: linux-mm@...ck.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	peter.griffin@...aro.org,
	bettyzhou@...gle.com,
	Terry Tritton <terry.tritton@...aro.org>
Subject: [PATCH] selftests/mm: uffd-unit-test check if huge page size is 0

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.tritton@...aro.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