[PATCH linux-next] RFC: torture: add pr_flush to flush the results to console

[zhouzhouyi]

From: Zhouyi Zhou <zhouzhouyi@xxxxxxxxx>

currently tools/testing/selftests/rcutorture/bin/torture.sh reports
false positve because of kthread printing.

Commit "printk: add functions to prefer direct printing" (2bb2b7b57f812)
have added functions to prefer direct printing activated for the primary
import messages.

Meanwhile adding printk_prefer_direct_enter/exit to
torture_cleanup_begin/end still can't eliminate the false positives
for a hundred percent.

This patch add pr_flush to torture_cleanup_end because the latter
is sleepable.

Reported-by: Zhouyi Zhou <zhouzhouyi@xxxxxxxxx>
Signed-off-by: Zhouyi Zhou <zhouzhouyi@xxxxxxxxx>
Tested-by: Zhouyi Zhou <zhouzhouyi@xxxxxxxxx> 
---
 kernel/torture.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/torture.c b/kernel/torture.c
index 789aeb0e1159..b51e42463a67 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -878,6 +878,7 @@ void torture_cleanup_end(void)
 	mutex_lock(&fullstop_mutex);
 	torture_type = NULL;
 	mutex_unlock(&fullstop_mutex);
+	pr_flush(1000, true);
 }
 EXPORT_SYMBOL_GPL(torture_cleanup_end);
 
-- 
2.25.1