percpu: add missing lockdep_assert_held to func pcpu_free_area

Add a missing lockdep_assert_held for pcpu_lock to improve consistency and safety throughout mm/percpu.c. Signed-off-by: Dennis Zhou <[email protected]> Signed-off-by: Tejun Heo <[email protected]>
zarubaf · Jun 20, 2017 · 5ccd30e · 5ccd30e
1 parent 1328710
commit 5ccd30e
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/mm/percpu.c b/mm/percpu.c
@@ -672,6 +672,8 @@ static void pcpu_free_area(struct pcpu_chunk *chunk, int freeme,
 	int to_free = 0;
 	int *p;
 
+	lockdep_assert_held(&pcpu_lock);
+
 	freeme |= 1;	/* we are searching for <given offset, in use> pair */
 
 	i = 0;