rajesh@rajesh-Inspiron-N5110:~/raja/dev_drivers$ cat hello.c
#include<kernel.h>
#include<linux/module.h>
#include<linux/init.h>
int my_init(void)
{
printk("Hello world \n");
return 0;
}
void my_cleanup(void)
{
printk("Goodbye world \n");
}
module_init(my_init);
module_exit(my_cleanup);
rajesh@rajesh-Inspiron-N5110:~/raja/dev_drivers$ make
make -C /lib/modules/2.6.35-22-generic/build M=/home/rajesh/raja/dev_drivers modules
make[1]: Entering directory `/usr/src/linux-headers-2.6.35-22-generic'
Building modules, stage 2.
MODPOST 0 modules
make[1]: Leaving directory `/usr/src/linux-headers-2.6.35-22-generic'
rajesh@rajesh-Inspiron-N5110:~/raja/dev_drivers$ sudo insmod hello.ko
[sudo] password for rajesh:
insmod: error inserting 'hello.ko': -1 File exists
rajesh@rajesh-Inspiron-N5110:~/raja/dev_drivers$ ls
hello.c hello.ko hello.mod.c hello.mod.o hello.o Makefile module.ko module.mod.c module.mod.o module.o modules.order Module.symvers
rajesh@rajesh-Inspiron-N5110:~/raja/dev_drivers$ sudo insmod he
he hecubafb hed hexium_gemini hexium_orion
rajesh@rajesh-Inspiron-N5110:~/raja/dev_drivers$ ls
hello.c hello.ko hello.mod.c hello.mod.o hello.o Makefile module.ko module.mod.c module.mod.o module.o modules.order Module.symvers


please help me out in solving

You need to be root to load a module to the kernel. Put sudo before the command.

rajesh@rajesh-Inspiron-N5110:~/raja/dev_drivers$ cat hello.c
#include<kernel.h>
#include<linux/module.h>
#include<linux/init.h>
int my_init(void)
{
printk("Hello world \n");
return 0;
}
void my_cleanup(void)
{
printk("Goodbye world \n");
}
module_init(my_init);
module_exit(my_cleanup);
rajesh@rajesh-Inspiron-N5110:~/raja/dev_drivers$ make
make -C /lib/modules/2.6.35-22-generic/build M=/home/rajesh/raja/dev_drivers modules
make[1]: Entering directory `/usr/src/linux-headers-2.6.35-22-generic'
Building modules, stage 2.
MODPOST 0 modules
make[1]: Leaving directory `/usr/src/linux-headers-2.6.35-22-generic'
rajesh@rajesh-Inspiron-N5110:~/raja/dev_drivers$ sudo insmod hello.ko
[sudo] password for rajesh:
insmod: error inserting 'hello.ko': -1 File exists
rajesh@rajesh-Inspiron-N5110:~/raja/dev_drivers$ ls
hello.c hello.ko hello.mod.c hello.mod.o hello.o Makefile module.ko module.mod.c module.mod.o module.o modules.order Module.symvers
rajesh@rajesh-Inspiron-N5110:~/raja/dev_drivers$ sudo insmod he
he hecubafb hed hexium_gemini hexium_orion
rajesh@rajesh-Inspiron-N5110:~/raja/dev_drivers$ ls
hello.c hello.ko hello.mod.c hello.mod.o hello.o Makefile module.ko module.mod.c module.mod.o module.o modules.order Module.symvers

Please read the error that it is throwing
That means you have already inserted this module and have not removed it. Use rmmod to remove the module and then try to insert it i.e.

ThanQ for the reply its working fine now!!!

Thanks a lot bsat!!
It worked

My Friend Kshikhar, it does not make any sense when you respond to an old solved thread.