ioctl: move doc to README

rootfs_overlay/ioctl.sh

@@ -1,5 +1,7 @@
 #!/bin/sh
 set -e
+f=/sys/kernel/debug/lkmc_ioctl
 insmod /ioctl.ko
-/ioctl.out /sys/kernel/debug/lkmc_ioctl
+[ "$(/ioctl.out "$f" 0 1)" = 2 ]
+[ "$(/ioctl.out "$f" 1 1 1)" = '2 0' ]
 rmmod ioctl

rootfs_overlay/test_all.sh

@@ -5,6 +5,7 @@ for test in \
   /character_device_create.sh \
   /debugfs.sh \
   /fops.sh \
+  /ioctl.sh \
   /procfs.sh \
   /seq_file.sh \
   /seq_file_single_open.sh \