Problem in First-Patch-Tutorial

[SIMRAN SINGHAL]

On Mon, Mar 13, 2017 at 12:05 AM, Alexander Kapshuk
<alexander.kapshuk at gmail.com> wrote:
> On Sun, Mar 12, 2017 at 8:20 PM, SIMRAN SINGHAL
> <singhalsimran0 at gmail.com> wrote:
>> On Sun, Mar 12, 2017 at 10:15 PM, Alexander Kapshuk
>> <alexander.kapshuk at gmail.com> wrote:
>>> On Sun, Mar 12, 2017 at 5:34 PM,  <valdis.kletnieks at vt.edu> wrote:
>>>> On Sun, 12 Mar 2017 15:49:31 +0200, Alexander Kapshuk said:
>>>>
>>>>> Are these drivers, drivers/iio/dummy/{iio_dummy_evgen,iio_dummy}.ko,
>>>>> something of your own making, as I'm not seeing them in the kernel
>>>>> source tree?
>>>>>
>>>>> The 'modules_install' make target installs drivers that have been
>>>>> compiled as modules as opposed to those compiled into the kernel, into
>>>>> /lib/modules/`uname -r`. For your own modules added to the kernel
>>>>> source tree, or built out-of-tree, that would involve putting
>>>>> appropriate entries into  Kconfig and/or Makefiles.
>>>>>
>>>>> Modeprobe expects your module to be found in /lib/modules/`uname -r`.
>>>>> Otherwise, your module won't get loaded.
>>>>
>>>> One other thing to remember is that although 'make modules_install' will
>>>> take all the .ko files from in-tree modules and put them in their proper
>>>> place in /lib/modules/`uname-r`  and then run 'depmod', many out-of-tree
>>>> Makefiles manage to forget to do that last step.
>>>>
>>>> modprobe is a wrapper around insmod - and the file produced by 'depmod'
>>>> are what the wrapper uses to find the module.
>>>
>>> Thanks for elaborating on that.
>>
>> Still not working
>>
>> First I executed following commands:-
>>
>> $ make drivers/iio/dummy/iio_dummy_evgen.ko
>> $ make drivers/iio/dummy/iio_dummy.ko
>>
>> Above commands executed successfully
>>
>> Then I run following command:
>> $ insmod iio_dummy_evgen.ko
>>
>> Getting following error:
>> insmod: ERROR: could not load module iio_dummy_evgen.ko: No such file
>> or directory
>>
>> And, then I try executing them from driver/staging/dummy and then I
>> got this error:
>> insmod: ERROR: could not insert module iio_dummy_evgen.ko: Operation
>> not permitted
>
> You have to run insmod as user root. Either specify the full path to
> your module, or cd into the directory where the module is and run
> insmod from there.

I tried this before also but as you said I tried it again:
# insmod iio_dummy_evgen.ko
insmod: ERROR: could not insert module iio_dummy_evgen.ko: Invalid module format

Now, I am getting this error.