From 39c96a1b96a5991b1c9e79b85a8d74ef93b36026 Mon Sep 17 00:00:00 2001
From: Davidlohr Bueso <dave@stgolabs.net>
Date: Fri, 17 Nov 2017 15:31:11 -0800
Subject: sysvipc: duplicate lock comments wrt ipc_addid()

The comment in msgqueues when using ipc_addid() is quite useful imo.
Duplicate it for shm and semaphores.

Link: http://lkml.kernel.org/r/20170831172049.14576-3-dave@stgolabs.net
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 ipc/shm.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'ipc/shm.c')

diff --git a/ipc/shm.c b/ipc/shm.c
index bd652755d32c..378c929194ce 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -601,6 +601,7 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
 	shp->shm_file = file;
 	shp->shm_creator = current;
 
+	/* ipc_addid() locks shp upon success. */
 	error = ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni);
 	if (error < 0)
 		goto no_id;
-- 
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