Compile Linux kernel module for 32bit cpu

Question

I am learning how to make a Linux kernel module and i want to compile it for a 32bit CPU. How can I do that?

My current command to compile the kernel (which defaults to 64bit) is:

obj-m += test.o

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

In gcc, I would use the -m32 flag but in this case, I don't know how the Kernel compilation works, so I don't know what to change.

Answer 1

You need to cross compile the module. Please take a look at this page http://kernelnewbies.org/FAQ/KernelCrossCompilation .