002.新建hello模块代码实例

以构建一个hello模块为例：
装载和卸载命令如下：

console:/ # insmod /data/hello.ko
[13038.085272][T1209075] insmod: Hello world
console:/ #
console:/ # rmmod /data/hello.ko
[13044.822043][T1109076] rmmod: Goodbye,cruel world

新建hello模块代码实例

diff --git a/drivers/Kconfig b/drivers/Kconfig
index 94f6e63cb..4f8400bc2 100755
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -238,4 +238,5 @@ source "drivers/counter/Kconfig"
 source "drivers/most/Kconfig"

+source "drivers/hello/Kconfig"
 endmenu
diff --git a/drivers/Makefile b/drivers/Makefile
index 1ae7302ea..6f4a51a8f 100755
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -188,4 +188,5 @@ obj-$(CONFIG_GNSS)          += gnss/
 obj-$(CONFIG_INTERCONNECT)     += interconnect/
 obj-$(CONFIG_COUNTER)          += counter/
 obj-$(CONFIG_MOST)             += most/
\ No newline at end of file
+obj-$(CONFIG_HELLO_WORLD) += hello/

cat drivers/hello/Kconfig

config HELLO_WORLD
  tristate "hello kernel"
        default m

cat drivers/hello/Makefile

MODULE_NAME = hello

obj-$(CONFIG_HELLO_WORLD) := $(MODULE_NAME).o
$(MODULE_NAME)-y := \
        hello_world.o

cat drivers/hello/hello_world.c

#include<linux/init.h>
#include<linux/module.h>

MODULE_LICENSE("Dual BSD/GPL");


static int hello_init(void){
    printk(KERN_ALERT "Hello world\n");
    return 0;
}

static void hello_exit(void){
    printk(KERN_ALERT "Goodbye,cruel world\n");
}

module_init(hello_init);
module_exit(hello_exit);