refperf: Set reader_tasks to NULL after kfree()

Set reader_tasks to NULL after kfree() in ref_scale_cleanup() to
improve debugging experience with kernel debugging tools. This
follows the common pattern of NULLing pointers after freeing to
avoid dangling pointer issues during debugging sessions.

Setting pointers to NULL after freeing helps debugging tools like
kdgb,drgn, and other kernel debuggers by providing clear indication
that the memory has been freed and the pointer is no longer valid.

Suggested-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Kaushlendra Kumar <kaushlendra.kumar@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c
index 7f3d23762ef7c7fb010d0da70153f4fe2e2cb161..19841704d8f5796941c1578c58df19a848b6e611 100644 (file)
--- a/kernel/rcu/refscale.c
+++ b/kernel/rcu/refscale.c
@@ -1133,6 +1133,7 @@ ref_scale_cleanup(void)
                                             reader_tasks[i].task);
        }
        kfree(reader_tasks);
+       reader_tasks = NULL;
 
        torture_stop_kthread("main_task", main_task);