seq_file, printk to pr_info, disk persistency

rootfs_overlay/seq_file.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+set -ex
+
+insmod /seq_file.ko
+cd /sys/kernel/debug
+
+cat 'lkmc_seq_file'
+# => 0
+# => 1
+# => 2
+
+cat 'lkmc_seq_file'
+# => 3
+# => 4
+# => 5
+
+# TODO understand, why does this print nothing?
+dd if='lkmc_seq_file' bs=1 count=2 skip=2

rootfs_overlay/seq_file_single.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+set -ex
+insmod /seq_file_single.ko
+cd /sys/kernel/debug
+cat 'lkmc_seq_file_single'
+# => abcd
+dd if='lkmc_seq_file_single' bs=1 skip=2
+# => cd