[PATCH kvm-unit-tests v2 2/6] s390x: smp: Test SIGP RESTART against stopped CPU

[Eric Farman <farman@linux.ibm.com>]

test_restart() makes two smp_cpu_restart() calls against CPU 1.
It claims to perform both of them against running (operating) CPUs,
but the first invocation tries to achieve this by calling
smp_cpu_stop() to CPU 0. This will be rejected by the library.

Let's fix this by making the first restart operate on a stopped CPU,
to ensure it gets test coverage instead of relying on other callers.

Fixes: 166da884d ("s390x: smp: Add restart when running test")
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
---
 s390x/smp.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/s390x/smp.c b/s390x/smp.c
index 068ac74d..2f4af820 100644
--- a/s390x/smp.c
+++ b/s390x/smp.c
@@ -50,10 +50,6 @@ static void test_start(void)
 	report_pass("start");
 }
 
-/*
- * Does only test restart when the target is running.
- * The other tests do restarts when stopped multiple times already.
- */
 static void test_restart(void)
 {
 	struct cpu *cpu = smp_cpu_from_idx(1);
@@ -62,8 +58,8 @@ static void test_restart(void)
 	lc->restart_new_psw.mask = extract_psw_mask();
 	lc->restart_new_psw.addr = (unsigned long)test_func;
 
-	/* Make sure cpu is running */
-	smp_cpu_stop(0);
+	/* Make sure cpu is stopped */
+	smp_cpu_stop(1);
 	set_flag(0);
 	smp_cpu_restart(1);
 	wait_for_flag();
-- 
2.32.0