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That is not guaranteed on systems with sparse or memoryless nodes, or when a cpuset restricts the task. Pick two nodes from MPOL_F_MEMS_ALLOWED and use MAXNODE_FOR_MASK() when passing the masks to mbind(). Keep the two-node requirement because the test verifies that pages are allocated on different nodes. Signed-off-by: Shivank Garg --- tools/testing/selftests/kvm/guest_memfd_test.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c index ea8e38064e83..cc5abca1adae 100644 --- a/tools/testing/selftests/kvm/guest_memfd_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_test.c @@ -127,18 +127,19 @@ static void test_mbind(int fd, size_t total_size) static void test_numa_allocation(int fd, size_t total_size) { unsigned long node0_mask, node1_mask; - unsigned long maxnode = 8; + unsigned long maxnode = MAXNODE_FOR_MASK(node0_mask); + unsigned long mems_allowed; int nid0, nid1; void *pages[4]; int status[4]; char *mem; int i; - if (!is_multi_numa_node_system()) + if (kvm_get_numa_memory_nodes(&mems_allowed) < 2) return; - nid0 = 0; - nid1 = 1; + nid0 = kvm_get_next_numa_node(mems_allowed, -1); + nid1 = kvm_get_next_numa_node(mems_allowed, nid0); node0_mask = BIT(nid0); node1_mask = BIT(nid1); -- 2.43.0