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 <dennisz@fb.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/mm/percpu.c b/mm/percpu.c
index c03753054099939791f231de46b965f9e3d88a77..be95d3192acba2d962cc086ce0cdaed73d79f46d 100644 (file)
--- 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;