[PATCH kvm-unit-tests v1 2/6] s390x: smp: Test SIGP RESTART against stopped CPU

Eric Farman
2022-03-03T21:04:37Z

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>
---
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