From c9b101d1a2c7f83453efea65742a91497d59835a Mon Sep 17 00:00:00 2001
From: Michael Kerrisk <mtk.manpages@gmail.com>
Date: Mon, 25 Dec 2017 16:57:11 +0100
Subject: [PATCH] cgroups.7: Mention ENOENT error that can occur when writing
 to subtree_control file

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
---
 man7/cgroups.7 | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/man7/cgroups.7 b/man7/cgroups.7
index 91fd650bb..f23fbcb0d 100644
--- a/man7/cgroups.7
+++ b/man7/cgroups.7
@@ -679,6 +679,15 @@ echo '+pids -memory' > x/y/cgroup.subtree_control
 .in
 .IP
 .PP
+An attempt to enable a controller
+that is not present in
+.I cgroup.controllers
+leads to an
+.B ENOENT
+error when writing to the
+.I cgroup.subtree_control
+file.
+.PP
 Because the list of controllers in
 .I cgroup.subtree_control
 is a subset of those