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# If KERNELRELEASE is defined, we've been invoked from the
# kernel build system and can use its language.
ifneq ($(KERNELRELEASE),)
    obj-m := hello.o
# Otherwise we were called directly from the command
# line; invoke the kernel build system.
else
    KERNELDIR ?= /lib/modules/$(shell uname -r)/build
    PWD := $(shell pwd)
default:
    $(MAKE) -C $(KERNELDIR) M=$(PWD) modules
endif
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inc/hello.h
main/hello.c, main.c, Makefile
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hello.h
void hello(char name[]);

hello.c
#include <stdio.h>
void hello(char name[])
{
printf("Hello %s!\n", name);
}

main.c
#include <stdio.h>
#include "../inc/hello.h"
// The second
int main( ......
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