From 5ccd30e40e731051f6d1eb02f7ac073c1ef9deba Mon Sep 17 00:00:00 2001
From: Dennis Zhou <dennisz@fb.com>
Date: Mon, 19 Jun 2017 19:28:29 -0400
Subject: [PATCH] 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>
---
 mm/percpu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/percpu.c b/mm/percpu.c
index c03753054099..be95d3192acb 100644
--- 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;
-- 
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