Question

我正在尝试升级我的守护进程代码，以便它不是可执行文件，而是内核模块，但即使使用一个简单的例子我也很困难。

这是我尝试过的代码：

#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");
}

因为我知道我不能直接编译代码，所以我尝试复制并稍微修改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}

然后在命令行上我执行了“make”，期望安装程序：

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 d.o d.c
    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 d.c: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 d.c: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 d.c:1:
    /lib/modules/2.6.21.5-smp/build/include/asm/module.h:62:2: error: #error unknown processor family
    make: *** [d.o] Error 1

当我只处理两个记录良好的函数时，为什么要获取所有这些错误？我的makefile关闭了吗？请指教？

Answer 1

没关系。我发现自己是一个答案：

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

它声明：

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

制作简单的linux内核模块

1 个答案: