Without this, rcu_note_context_switch() will complain if an RCU read
lock is held when migrate_enable() calls stop_one_cpu().

Signed-off-by: Scott Wood <redacted>
---
v2: Added comment.

If my migrate disable changes aren't taken, then pin_current_cpu()
will also need to use sleeping_lock_inc() because calling
__read_rt_lock() bypasses the usual place it's done.

 include/linux/sched.h    | 4 ++--
 kernel/rcu/tree_plugin.h | 2 +-
 kernel/sched/core.c      | 8 ++++++++
 3 files changed, 11 insertions(+), 3 deletions(-)

--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c

@@ -7405,7 +7405,15 @@ void migrate_enable(void)
 			unpin_current_cpu();
 			preempt_lazy_enable();
 			preempt_enable();
+
+			/*
+			 * sleeping_lock_inc suppresses a debug check for
+			 * sleeping inside an RCU read side critical section
+			 */
+			sleeping_lock_inc();
 			stop_one_cpu(task_cpu(p), migration_cpu_stop, &arg);
+			sleeping_lock_dec();