内核模块导致文件错误

Question

So I am trying to build a simple first kernel module in arch linux but I am getting an error with my make file

I tried find the kernel headers for my uname -r but no luck

obj-m += Test.c
KIDR = /usr/lib/modules/5.1.3-arch1-1-ARCH
all:
        $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
clean:
        echo DONE

my errors are:

prompt$ make
make -C  SUBDIRS=/home/johndoe/KernelModule modules
make[1]: *** SUBDIRS=/home/johndoe/KernelModule: No such file or directory.  Stop.
make: *** [Makefile:4: all] Error 2

and my code is:

#include <linux/init.h>
#include <linux/module.h>
static int entry_func(void){
        printk("ENTERED");
        return 0;
}

static exit_func(void){
        printk("EXITING");
}
module_init(entry_func);
module_exit(exit_func);

Answer 1

It seems that your path isn´t correct. Please check the path of your source file. You use the $SUBDIRS variable for the path where your external module is located. So you can remove this if your module is located by your source file.

obj-m   += Test.o

all:
    make -C ${KDIR} modules

clean:
    make -C ${KDIR} clean

You can find additional information here .

Do you have installed the kernel sources? Otherwise, your system doesn´t contain any sources.