linux-kernel - [PATCH 1/4] percpu: add missing lockdep_assert_held to func pcpu_free

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Date:   Mon, 19 Jun 2017 19:28:29 -0400
From:   Dennis Zhou <dennisz@...com>
To:     Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <kernel-team@...com>, Dennis Zhou <dennisz@...com>
Subject: [PATCH 1/4] 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@...com>
---
 mm/percpu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/percpu.c b/mm/percpu.c
index e0aa8ae..f94a5eb 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;
-- 
2.9.3