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[PATCH 3/3 -rt] lockdep: selftest: save/restore migrate_disable count

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From: Yong Zhang <yong.zhang@xxxxxxxxxxxxx>

->migrate_disable_atomic will corrupt when doing some
case, such as double lock...

->migrate_disable will not be affected for now since
we have preempt disabled when doing seft test.
Just record it also for safe.

Signed-off-by: Yong Zhang <yong.zhang0@xxxxxxxxx>
---
Found it when enable CONFIG_SCHED_DEBUG.

 lib/locking-selftest.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c
index 23b8564..a9cb9e4 100644
--- a/lib/locking-selftest.c
+++ b/lib/locking-selftest.c
@@ -939,6 +939,12 @@ static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask)
 {
 	unsigned long saved_preempt_count = preempt_count();
 	int expected_failure = 0;
+#ifdef CONFIG_PREEMPT_RT_FULL
+	int saved_migrate_disable = current->migrate_disable;
+# ifdef CONFIG_SCHED_DEBUG
+	int saved_migrate_disable_atomic = current->migrate_disable_atomic;
+# endif
+#endif
 
 	WARN_ON(irqs_disabled());
 
@@ -980,6 +986,13 @@ static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask)
 	 * count, so restore it:
 	 */
 	preempt_count() = saved_preempt_count;
+#ifdef CONFIG_PREEMPT_RT_FULL
+	current->migrate_disable = saved_migrate_disable;
+# ifdef CONFIG_SCHED_DEBUG
+	current->migrate_disable_atomic = saved_migrate_disable_atomic;
+# endif
+#endif
+
 #ifdef CONFIG_TRACE_IRQFLAGS
 	if (softirq_count())
 		current->softirqs_enabled = 0;
-- 
1.7.5.4

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