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It can be accessed and reviewed at: https://github.com/lxc/lxcfs/pull/282

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=== Description (from pull-request) ===
Mount `/sys/devices/system/cpu/online` introduced by #278.
From 24ee58a5c782561ed6f2118c63be4b7b8c8b23a4 Mon Sep 17 00:00:00 2001
From: Jakub Skokan <[email protected]>
Date: Tue, 21 May 2019 15:50:54 +0200
Subject: [PATCH] mount hook: mount /sys/devices/system/cpu/online

Signed-off-by: Jakub Skokan <[email protected]>
---
 share/lxc.mount.hook.in | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/share/lxc.mount.hook.in b/share/lxc.mount.hook.in
index 74a1e46..c70eec3 100755
--- a/share/lxc.mount.hook.in
+++ b/share/lxc.mount.hook.in
@@ -22,6 +22,13 @@ if [ -d @LXCFSTARGETDIR@/proc/ ]; then
     done
 fi
 
+# /sys/devices/system/cpu
+if [ -d @LXCFSTARGETDIR@/sys/devices/system/cpu ] ; then
+    for entry in @LXCFSTARGETDIR@/sys/devices/system/cpu/*; do
+        [ -e "${LXC_ROOTFS_MOUNT}/sys/devices/system/cpu/$(basename $entry)" ] 
|| continue
+        mount -n --bind $entry 
${LXC_ROOTFS_MOUNT}/sys/devices/system/cpu/$(basename $entry)
+    done
+fi
 
 # Allow nesting lxcfs
 if [ -d ${LXC_ROOTFS_MOUNT}@LXCFSTARGETDIR@/ ]; then
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