selftests/futex: Set the home_node in futex_numa_mpol

The test fails at the MPOL step if multiple nodes are available. The
reason is that mbind() sets the policy but the home_node, which is
retrieved by the futex code, is not set. This causes to retrieve the
current node and with multiple nodes it fails on one of the iterations.

Use numa_set_mempolicy_home_node() to set the expected node.
Use ksft_exit_fail_msg() to fail and exit in order not to confuse ktap.

Fixes: 3163369407baf ("selftests/futex: Add futex_numa_mpol")
Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20250528085521.1938355-3-bigeasy@linutronix.de

diff --git a/tools/testing/selftests/futex/functional/futex_numa_mpol.c b/tools/testing/selftests/futex/functional/futex_numa_mpol.c
index 564dbd02d2f465d1e5b718132eaa4f2f00ae1dfa..a9ecfb2d3932add7e560d885dc2088313fbb63bb 100644 (file)
--- a/tools/testing/selftests/futex/functional/futex_numa_mpol.c
+++ b/tools/testing/selftests/futex/functional/futex_numa_mpol.c
@@ -210,6 +210,10 @@ int main(int argc, char *argv[])
                ret = mbind(futex_ptr, mem_size, MPOL_BIND, &nodemask,
                            sizeof(nodemask) * 8, 0);
                if (ret == 0) {
+                       ret = numa_set_mempolicy_home_node(futex_ptr, mem_size, i, 0);
+                       if (ret != 0)
+                               ksft_exit_fail_msg("Failed to set home node: %m, %d\n", errno);
+
                        ksft_print_msg("Node %d test\n", i);
                        futex_numa->futex = 0;
                        futex_numa->numa = FUTEX_NO_NODE;
@@ -220,8 +224,8 @@ int main(int argc, char *argv[])
                        if (0)
                                test_futex_mpol(futex_numa, 0);
                        if (futex_numa->numa != i) {
-                               ksft_test_result_fail("Returned NUMA node is %d expected %d\n",
-                                                     futex_numa->numa, i);
+                               ksft_exit_fail_msg("Returned NUMA node is %d expected %d\n",
+                                                  futex_numa->numa, i);
                        }
                }
        }