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You need to build the module within the Context of the Linux tree. By default, the compiler will look for user-space headers in /usr/include. There ARE some linux headers there (/usr/include/linux), but module.h is not one of them, as it deals with kernel constructs directly.
In short, you need a Makefile. Also, get rid of the #define MODULE. save the following to a file called Makefile and run make:
obj-m += foo.o
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
This triggers the kernel build system.
Given that you are using Ubuntu, you probably already have the kernel headers installed at /usr/src/linux-headers-$(uname -r). module.h lives here:
jameson@aqua:~$ ls /usr/src/linux-headers-$(uname -r)/include/linux/module.h
Last edited by jhwilliams; 11-26-2011 at 05:39 AM.