split kernel module api docs to README

rootfs_overlay/dep.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+set -e
+f=/sys/kernel/debug/lkmc_dep
+f2=/sys/kernel/debug/lkmc_dep2
+
+insmod /dep.ko
+insmod /dep2.ko
+
+# Initial value.
+[ "$(cat "$f")" = 0 ]
+
+# Changhing dep2 also changes dep.
+printf 1 > "$f2"
+[ "$(cat "$f")" = 1 ]
+
+# Changhing dep also changes dep2.
+printf 2 > "$f"
+[ "$(cat "$f2")" = 2 ]
+
+# sysfs shows us that the module has dependants.
+[ "$(cat /sys/module/dep/refcnt)" = 1 ]
+[ "$(ls /sys/module/dep/holders)" = dep2 ]
+rmmod /dep2.ko
+[ "$(cat /sys/module/dep/refcnt)" = 0 ]
+[ -z "$(ls /sys/module/dep/holders)" ]
+
+rmmod /dep.ko

rootfs_overlay/etc/modprobe.conf

@@ -1,8 +1 @@
-# This file does *not* specify modules to auto-load at startup,
-# you still need to explicitly load your modules from init.d:
-# https://superuser.com/questions/397842/automatically-load-kernel-module-at-boot-angstrom/1267464#1267464
-
-# Default parameters when loading modules.
-# Especially important due to loading module dependencies:
-# how else would you specify their parameters?
 options params i=12 j=34

rootfs_overlay/init_module.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+set -e
+insmod /init_module.ko
+rmmod init_module

rootfs_overlay/params.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+set -e
+d=/sys/module/params/parameters
+i="${d}/i"
+j="${d}/j"
+f=/sys/kernel/debug/lkmc_params
+
+insmod /params.ko
+[ "$(cat "$i")" = 0 ]
+[ "$(cat "$j")" = 0 ]
+[ "$(cat "$f")" = '0 0' ]
+printf 1 > "$i"
+[ "$(cat "$f")" = '1 0' ]
+printf 2 > "$j"
+[ "$(cat "$f")" = '1 2' ]
+rmmod params
+
+insmod /params.ko i=3 j=4
+[ "$(cat "$f")" = '3 4' ]
+rmmod params

rootfs_overlay/test_all.sh

@@ -4,9 +4,12 @@ for test in \
   /character_device.sh \
   /character_device_create.sh \
   /debugfs.sh \
+  /dep.sh \
   /fops.sh \
+  /init_module.sh \
   /ioctl.sh \
   /mmap.sh \
+  /params.sh \
   /procfs.sh \
   /seq_file.sh \
   /seq_file_single_open.sh \

rootfs_overlay/vermagic.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+set -e
+insmod /vermagic.ko
+rmmod vermagic