s390/test_unwind: add "backtrace" module parameter

By default no backtraces are printed when a test succeeds, but sometimes
it is useful to spot issues automated test doesn't cover. Add "backtrace"
module parameter to force it.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

diff --git a/arch/s390/lib/test_unwind.c b/arch/s390/lib/test_unwind.c
index 744b476..8be9ca2 100644 (file)
--- a/arch/s390/lib/test_unwind.c
+++ b/arch/s390/lib/test_unwind.c
@@ -20,6 +20,10 @@ static struct kunit *current_test;
 
 #define BT_BUF_SIZE (PAGE_SIZE * 4)
 
+static bool force_bt;
+module_param_named(backtrace, force_bt, bool, 0444);
+MODULE_PARM_DESC(backtrace, "print backtraces for all tests");
+
 /*
  * To avoid printk line limit split backtrace by lines
  */
@@ -98,7 +102,7 @@ static noinline int test_unwind(struct task_struct *task, struct pt_regs *regs,
                kunit_err(current_test, "Maximum number of frames exceeded\n");
                ret = -EINVAL;
        }
-       if (ret)
+       if (ret || force_bt)
                print_backtrace(bt);
        kfree(bt);
        return ret;