[PATCH 1/4] rcutorture: Allow a negative value for nfakewriters

[Uladzislau Rezki (Sony)]

Currently "nfakewriters" parameter can be set to any value but
there is no possibility to adjust it automatically based on how
many CPUs a system has where a test is run on.

To address this, if the "nfakewriters" is set to negative it will
be adjusted to num_possible_cpus() during torture initialization.

Signed-off-by: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
---
 kernel/rcu/rcutorture.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index d26fb1d33ed9..6bc161e1e8ac 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -4050,6 +4050,10 @@ rcu_torture_init(void)
 					  writer_task);
 	if (torture_init_error(firsterr))
 		goto unwind;
+
+	if (nfakewriters < 0)
+		nfakewriters = (int) num_possible_cpus();
+
 	if (nfakewriters > 0) {
 		fakewriter_tasks = kcalloc(nfakewriters,
 					   sizeof(fakewriter_tasks[0]),
-- 
2.39.5