linux-kernel - [PATCH 4/7] sysctl: Add missing annotation for start

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Date:   Tue, 31 Mar 2020 21:46:40 +0100
From:   Jules Irenge <jbi.octave@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     boqun.feng@...il.com, Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        linux-fsdevel@...r.kernel.org (open list:PROC SYSCTL)
Subject: [PATCH 4/7] sysctl: Add missing annotation for start_unregistering()

Sparse reports a warning at start_unregistering()

warning: context imbalance in start_unregistering()
	- unexpected unlock

The root cause is the missing annotation at start_unregistering()
Add the missing __must_hold(&sysctl_lock) annotation.

Signed-off-by: Jules Irenge <jbi.octave@...il.com>
---
 fs/proc/proc_sysctl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index c75bb4632ed1..d1b5e2b35564 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -307,6 +307,7 @@ static void proc_sys_prune_dcache(struct ctl_table_header *head)
 
 /* called under sysctl_lock, will reacquire if has to wait */
 static void start_unregistering(struct ctl_table_header *p)
+	__must_hold(&sysctl_lock)
 {
 	/*
 	 * if p->used is 0, nobody will ever touch that entry again;
-- 
2.24.1