Merge branch 'rcu/misc' into next

- In order to prepare the layout for nohz_full work deferral to
  user exit, the context tracking state must shrink the counter
  of transitions to/from RCU not watching. The only possible hazard
  is to trigger wrap-around more easily, delaying a bit grace periods
  when that happens. This should be a rare event though. Yet add
  debugging and torture code to test that assumption.

- Fix memory leak on locktorture module

- Annotate accesses in rculist_nulls.h to prevent from KCSAN warnings.
  On recent discussions, we also concluded that all those WRITE_ONCE()
  and READ_ONCE() on list APIs deserve appropriate comments. Something
  to be expected for the next cycle.

- Provide a script to apply several configs to several commits with torture.

- Allow torture to reuse a build directory in order to save needless
  rebuild time.

- Various cleanups.

1 files changed, 6 insertions, 2 deletions

diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index ce0362f0a871..6567e5eeacc0 100644
--- a/kernel/locking/locktorture.c
+++ b/kernel/locking/locktorture.c
@@ -103,8 +103,8 @@ static const struct kernel_param_ops lt_bind_ops = {
 	.get = param_get_cpumask,
 };
 
-module_param_cb(bind_readers, &lt_bind_ops, &bind_readers, 0644);
-module_param_cb(bind_writers, &lt_bind_ops, &bind_writers, 0644);
+module_param_cb(bind_readers, &lt_bind_ops, &bind_readers, 0444);
+module_param_cb(bind_writers, &lt_bind_ops, &bind_writers, 0444);
 
 long torture_sched_setaffinity(pid_t pid, const struct cpumask *in_mask, bool dowarn);
 
@@ -1211,6 +1211,10 @@ end:
 			cxt.cur_ops->exit();
 		cxt.init_called = false;
 	}
+
+	free_cpumask_var(bind_readers);
+	free_cpumask_var(bind_writers);
+
 	torture_cleanup_end();
 }