[PATCH 4/7] sysctl: Add missing annotation for start_unregistering()

[Jules Irenge]

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@xxxxxxxxx>
---
 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