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ref: 153150ffa40c8c951bd942995849a5826cbe62a1
parent: 0bd97e8aef5208bc92c3e72049f7fea198a90bd1
author: Manuel Mendez <mmendez534@gmail.com>
date: Fri Jan 19 08:17:00 CST 2018

handle more than 2 blacklisted modules in cmdline

example:
```sh
❯ docker run --rm -ti alpine
/ # KOPT_blacklist=igb,ixgbe,tg3
/ # for i in ${KOPT_blacklist/,/ }; do echo "blacklist $i"; done
blacklist igb
blacklist ixgbe,tg3
/ # for i in ${KOPT_blacklist//,/ }; do echo "blacklist $i"; done
blacklist igb
blacklist ixgbe
blacklist tg3
```

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -325,7 +325,7 @@

 [ "$KOPT_quiet" = yes ] && dmesg -n 1

 # optional blacklist

-for i in ${KOPT_blacklist/,/ }; do

+for i in ${KOPT_blacklist//,/ }; do

 	echo "blacklist $i" >> /etc/modprobe.d/boot-opt-blacklist.conf

 done