tests/unit/test-smp-parse: Explicit MachineClass name

If the MachineClass::name pointer is not explicitly set, it is NULL.
Per the C standard, passing a NULL pointer to printf "%s" format is
undefined. Some implementations display it as 'NULL', other as 'null'.
Since we are comparing the formatted output, we need a stable value.
The easiest is to explicit a machine name string.

Reviewed-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Yanan Wang <wangyanan55@huawei.com>
Tested-by: Yanan Wang <wangyanan55@huawei.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20211115145900.2531865-4-philmd@redhat.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/tests/unit/test-smp-parse.c b/tests/unit/test-smp-parse.c
index 3fff2af4e2..b02450e25a 100644
--- a/tests/unit/test-smp-parse.c
+++ b/tests/unit/test-smp-parse.c
@@ -23,6 +23,8 @@
 #define MIN_CPUS 1   /* set the min CPUs supported by the machine as 1 */
 #define MAX_CPUS 512 /* set the max CPUs supported by the machine as 512 */
 
+#define SMP_MACHINE_NAME "TEST-SMP"
+
 /*
  * Used to define the generic 3-level CPU topology hierarchy
  *  -sockets/cores/threads
@@ -307,13 +309,13 @@ static struct SMPTestData data_generic_invalid[] = {
          * should tweak the supported min CPUs to 2 for testing */
         .config = SMP_CONFIG_GENERIC(T, 1, F, 0, F, 0, F, 0, F, 0),
         .expect_error = "Invalid SMP CPUs 1. The min CPUs supported "
-                        "by machine '(null)' is 2",
+                        "by machine '" SMP_MACHINE_NAME "' is 2",
     }, {
         /* config: -smp 512
          * should tweak the supported max CPUs to 511 for testing */
         .config = SMP_CONFIG_GENERIC(T, 512, F, 0, F, 0, F, 0, F, 0),
         .expect_error = "Invalid SMP CPUs 512. The max CPUs supported "
-                        "by machine '(null)' is 511",
+                        "by machine '" SMP_MACHINE_NAME "' is 511",
     },
 };
 
@@ -481,6 +483,8 @@ static void machine_base_class_init(ObjectClass *oc, void *data)
 
     mc->smp_props.prefer_sockets = true;
     mc->smp_props.dies_supported = false;
+
+    mc->name = g_strdup(SMP_MACHINE_NAME);
 }
 
 static void test_generic(void)