+ selftests-mm-uffd-unit-test-check-if-huge-page-size-is-0.patch added to mm-hotfixes-unstable branch

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

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@xxxxxxxxxx>
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@xxxxxxxxxx
Fixes: 16a45b57cbf2 ("selftests/mm: add framework for uffd-unit-test")
Signed-off-by: Terry Tritton <terry.tritton@xxxxxxxxxx>
Cc: Peter Griffin <peter.griffin@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 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@xxxxxxxxxx are

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





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