模块编译:找不到asm/linkage.h文件 [英] module compiling : asm/linkage.h file not found

问题描述

我正在尝试编译"hello world"内核模块的示例， 在ubuntu 11.04，内核3.2.6，gcc 4.5.2和fedora 16，内核3.2.7，gcc 4.6.7上发现的问题.

I am trying to compile an example of "hello world" Kernel Module, problems found on ubuntu 11.04, kernel 3.2.6, gcc 4.5.2 and fedora 16, kernel 3.2.7, gcc 4.6.7.

代码:

#include <linux/module.h>
#include <linux/init.h>
MODULE_LICENSE("GPL");

static int __init hello_init (void)
{
printk("Hello module init\n");
return 0;
}
static void __exit hello_exit (void)
{
printk("Hello module exit\n");
}
module_init(hello_init);
module_exit(hello_exit);

编译为:

gcc -D__KERNEL__ -I /usr/src/linux/include/ -DMODULE -Wall -O2 -c hello.c -o hello.o

错误:

在/usr/src/linux/include/linux/kernel.h:13:0中包含的文件中， 从/usr/src/linux/include/linux/cache.h:4， 从/usr/src/linux/include/linux/time.h:7， 从/usr/src/linux/include/linux/stat.h:60， 从/usr/src/linux/include/linux/module.h:10， 来自hello.c:1:/usr/src/linux/include/linux/linkage.h:5:25:致命错误: asm/linkage.h:找不到文件

In file included from /usr/src/linux/include/linux/kernel.h:13:0, from /usr/src/linux/include/linux/cache.h:4, from /usr/src/linux/include/linux/time.h:7, from /usr/src/linux/include/linux/stat.h:60, from /usr/src/linux/include/linux/module.h:10, from hello.c:1: /usr/src/linux/include/linux/linkage.h:5:25: fatal error: asm/linkage.h: file not found

然后我在/usr/src/linux/include/中发现没有名为"asm"的文件夹，而是"asm-generic"的文件夹； 因此我将软链接"asm"链接到"asm-generic"，并编译了agail:

then I found in /usr/src/linux/include/ there is no folder named 'asm' but 'asm-generic'; so I made a soft link 'asm' to 'asm-generic', and compiled agail:

这次错误是:

在/usr/src/linux/include/linux/preempt.h:9:0中包含的文件中， 从/usr/src/linux/include/linux/spinlock.h:50， 从/usr/src/linux/include/linux/seqlock.h:29， 从/usr/src/linux/include/linux/time.h:8， 从/usr/src/linux/include/linux/stat.h:60， 从/usr/src/linux/include/linux/module.h:10， 来自hello.c:1:/usr/src/linux/include/linux/thread_info.h:53:29:致命错误: asm/thread_info.h:找不到文件

In file included from /usr/src/linux/include/linux/preempt.h:9:0, from /usr/src/linux/include/linux/spinlock.h:50, from /usr/src/linux/include/linux/seqlock.h:29, from /usr/src/linux/include/linux/time.h:8, from /usr/src/linux/include/linux/stat.h:60, from /usr/src/linux/include/linux/module.h:10, from hello.c:1: /usr/src/linux/include/linux/thread_info.h:53:29: fatal error: asm/thread_info.h: file not found

所以我意识到我错了，但是为什么呢? T_T

So I realized I was wrong, but why ? T_T

推荐答案

obj-m += hello.o

all:
    make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:
    make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

是构建模块的正确方法，请参见 kbuild文档

is a proper way to build modules see kbuild documentation

要查看编译器调用之间的区别，您可以

And to see difference beetween your compiler invocation you could

cat /lib/modules/$(shell uname -r)/build/Makefile

并分析输出

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