linux-kernel - [PATCH v2 2/3] selftests/mm: Skip uffd hugetlb tests with insufficient hugepages

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Date: Wed,  6 Mar 2024 15:37:13 -0700
From: Nico Pache <npache@...hat.com>
To: linux-mm@...ck.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: ben@...adent.org.uk,
	shuah@...nel.org,
	akpm@...ux-foundation.org,
	usama.anjum@...labora.com
Subject: [PATCH v2 2/3] selftests/mm: Skip uffd hugetlb tests with insufficient hugepages

Now that run_vmtests.sh does not guarantee that the correct hugepage
count is available, add a check inside the userfaultfd hugetlb test to
verify the nr_hugepages count before continuing.

Signed-off-by: Nico Pache <npache@...hat.com>
---
 tools/testing/selftests/mm/uffd-stress.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/testing/selftests/mm/uffd-stress.c b/tools/testing/selftests/mm/uffd-stress.c
index 7e83829bbb335..1165446f10883 100644
--- a/tools/testing/selftests/mm/uffd-stress.c
+++ b/tools/testing/selftests/mm/uffd-stress.c
@@ -441,6 +441,12 @@ int main(int argc, char **argv)
 	parse_test_type_arg(argv[1]);
 	bytes = atol(argv[2]) * 1024 * 1024;
 
+	if (test_type == TEST_HUGETLB &&
+	   get_free_hugepages() < bytes / page_size) {
+		printf("skip: Skipping userfaultfd... not enough hugepages\n");
+		return KSFT_SKIP;
+	}
+
 	nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
 
 	nr_pages_per_cpu = bytes / page_size / nr_cpus;
-- 
2.44.0