hello world module problem

[chuchi]

Hello friends! I'm following the guide "The linux kernel module programming guide". I'm trying with the hello world mode, wich code is this:


#include <linux/module.h>
#include <linux/kernel.h>
int init_module(void)
{
printk(KERN_INFO "Hello world 1.\n");

return 0;
}
void cleanup_module(void)
{
printk(KERN_INFO "Goodbye world 1.\n");
}



And this is the Makefile:



obj-m += hello.o
all:
make -C /lib/modules/2.6.32-27-generic/build M=/home/jesus/pruebas/c modules
clean:
make -C /lib/modules/2.6.32-27-generic/build M=/home/jesus/pruebas/c clea



And the error message after "make all":


make -C /lib/modules/2.6.32-27-generic/build M=/home/jesus/pruebas/c modules
make[1]: se ingresa al directorio `/usr/src/linux-headers-2.6.32-27-generic'
make[2]: *** No hay ninguna regla para construir el objetivo `/home/jesus/pruebas/c/hello.c', necesario para `/home/jesus/pruebas/c/hello.o'. Alto.
make[1]: *** [_module_/home/jesus/pruebas/c] Error 2
make[1]: se sale del directorio `/usr/src/linux-headers-2.6.32-27-generic'
make: *** [all] Error 2



What am i doing wrong!! Many thanks!

[johnl]

What did you name your .c file? It needs to be the same as the object file (hello.o) that you listed in your makefile, except it should end with .c (hello.c).

[dwhitney67]

What am i doing wrong!! Many thanks!

Follow johnl's advice with regards to naming your source file.

Also, simplify your Makefile with something like:


obj-m := hello.o # Module Name is hello.c

KDIR := /lib/modules/$(shell uname -r)/build

all:
$(MAKE) -C $(KDIR) M=$(PWD) modules

clean:
$(MAKE) -C $(KDIR) M=$(PWD) clean

[chuchi]

Ey!! now it works!!! My file name was already hello.c, but with your Makefile now it works. Many thanks to all!!!