制作简单的linux内核模块

我试图升级我的守护程序代码，而不是一个可执行文件，它将成为一个内核模块，但即使使用一个简单的例子，我仍然有困难。

这是我尝试的代码：

#include <linux/module.h> #include <linux/kernel.h> int init_module(void){ printk("Hello world 1.n"); return 0; } void cleanup_module(void){ printk(KERN_ALERT "Goodbye world 1.n"); }

而且因为我明白我不能直接编译代码，所以我试图复制并稍微修改makefile，如下所示：

WARN := -W -Wall -Wstrict-prototypes -Wmissing-prototypes INCLUDE := -isystem /lib/modules/`uname -r`/build/include CFLAGS := -O2 -DMODULE -D__KERNEL__ ${WARN} ${INCLUDE} CC := gcc OBJS := ${patsubst %.c,%.o,${wildcard *.c}} all: ${OBJS}

然后在命令行上执行“make”，期望安装程序：

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这是我的输出：

gcc -O2 -DMODULE -D__KERNEL__ -W -Wall -Wstrict-prototypes -Wmissing-prototypes -isystem /lib/modules/`uname -r`/build/include -c -o do dc In file included from /lib/modules/2.6.21.5-smp/build/include/asm/thread_info.h:16,from /lib/modules/2.6.21.5-smp/build/include/linux/thread_info.h:21,from /lib/modules/2.6.21.5-smp/build/include/linux/preempt.h:9,from /lib/modules/2.6.21.5-smp/build/include/linux/spinlock.h:49,from /lib/modules/2.6.21.5-smp/build/include/linux/module.h:9,from dc:1: /lib/modules/2.6.21.5-smp/build/include/asm/processor.h:82: error: 'CONfig_X86_L1_CACHE_SHIFT' undeclared here (not in a function) /lib/modules/2.6.21.5-smp/build/include/asm/processor.h:82: error: requested alignment is not a constant In file included from /lib/modules/2.6.21.5-smp/build/include/linux/sched.h:51,from /lib/modules/2.6.21.5-smp/build/include/linux/utsname.h:35,from /lib/modules/2.6.21.5-smp/build/include/asm/elf.h:12,from /lib/modules/2.6.21.5-smp/build/include/linux/elf.h:7,from /lib/modules/2.6.21.5-smp/build/include/linux/module.h:15,from dc:1: /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:33:3: error: #error You lose. /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if In file included from /lib/modules/2.6.21.5-smp/build/include/linux/module.h:21,from dc:1: /lib/modules/2.6.21.5-smp/build/include/asm/module.h:62:2: error: #error unkNown processor family make: *** [do] Error 1

为什么当我只处理两个有据可查的function时，我应该得到所有这些错误？ 我的makefileclosures了吗？ 请指教？

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没关系。 我发现自己的答案是：

https://www.kernel.org/doc/Documentation/kbuild/modules.txt

它指出：

To build against the running kernel use: $ make -C /lib/modules/`uname -r`/build M=$PWD Then to install the module(s) just built,add the target "modules_install" to the command: $ make -C /lib/modules/`uname -r`/build M=$PWD modules_install