cannot insmod sculld in ldd3

cannot insmod sculld in ldd3

[Ali Aminian]

Hello Tobin C. Harding
I used the source you provided and still receive the same error.
also the output of "uname -a" is this. if that matters:
Linux ali-Z97-D3H 4.4.0-62-generic #83-Ubuntu SMP Wed Jan 18 14:10:15
UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

cannot insmod sculld in ldd3

[Aruna Hewapathirane]

<snip>
>> Now I wonder what is the proper way to export "Module.symvers"
>> information to the outside so that modules that use it do not have to
>> copy that file into their directory.

If you use a top-level Makefile like the one below it will create the
necessary Module.symvers file.
I am not sure if this is the correct or recommended way,  I had kernel
modules in separate directories a long
while back when I was learning+testing and this worked for me.

obj-m := lddbus/ sculld/

KERNELDIR ?= /lib/modules/$(shell uname -r)/build
PWD       := $(shell pwd)

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

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

Hope this helps - Aruna
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cannot insmod sculld in ldd3

[Greg KH]

On Mon, Mar 13, 2017 at 12:19:58PM +0800, Freeman Zhang wrote:
> Hi Greg,
> 
> 
> On 3/13/17 3:03 AM, Greg KH wrote:
> 
> > 
> > 'depmod' handles all of this when you install a kernel and its modules.
> > 
> 
> Thanks for that information, now I take 'depmod' seriously and stop
> making up inelegant methods. I studied the 'kmod', both its behaviors
> and codes, and got plenty of ideas about module symbol stuff.
> 
> However, I am still wondering why copy Module.symvers file works too, at
> building time?

Because that is what depmod creates, you probably didn't change much, if
anything, from the kernel version you copied it from.  But don't do
that, it is probably wrong.

thanks,

greg k-h

cannot insmod sculld in ldd3

[Freeman Zhang]

Hi Greg,


On 3/13/17 3:03 AM, Greg KH wrote:

> 
> 'depmod' handles all of this when you install a kernel and its modules.
> 

Thanks for that information, now I take 'depmod' seriously and stop
making up inelegant methods. I studied the 'kmod', both its behaviors
and codes, and got plenty of ideas about module symbol stuff.

However, I am still wondering why copy Module.symvers file works too, at
building time?

>	step 1.   build lddbus, generate `*.ko` and `Module.symvers`
>	step 2.   copy `Module.symvers` located in lddbus directory
>	          to sculld directory
>	step 3.   build sculld


All the best!
Freeman


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cannot insmod sculld in ldd3

[Greg KH]

On Sun, Mar 12, 2017 at 09:42:36PM +0330, Ali Aminian wrote:
> Hello, Freeman Zhang. copying 'Module.symvers' to sculld folder solved
> the problem. Thank you, man.
> 
> Now I wonder what is the proper way to export "Module.symvers"
> information to the outside so that modules that use it do not have to
> copy that file into their directory. for example, what do pci and usb
> buses do in this case?

'depmod' handles all of this when you install a kernel and its modules.

hope this helps,

greg k-h

cannot insmod sculld in ldd3

[Ali Aminian]

Hello, Freeman Zhang. copying 'Module.symvers' to sculld folder solved
the problem. Thank you, man.

Now I wonder what is the proper way to export "Module.symvers"
information to the outside so that modules that use it do not have to
copy that file into their directory. for example, what do pci and usb
buses do in this case?

cannot insmod sculld in ldd3

[Freeman Zhang]

Hi

On 3/11/17 12:49 AM, Ali Aminian wrote:


> i checked dmsg and it says:
> [12073.858764] sculld: no symbol version for unregister_ldd_driver
> [12073.858767] sculld: Unknown symbol unregister_ldd_driver (err -22)
> [12073.858780] sculld: no symbol version for register_ldd_device
> [12073.858781] sculld: Unknown symbol register_ldd_device (err -22)
> [12073.858789] sculld: no symbol version for unregister_ldd_device
> [12073.858790] sculld: Unknown symbol unregister_ldd_device (err -22)
> [12073.858794] sculld: no symbol version for register_ldd_driver
> [12073.858795] sculld: Unknown symbol register_ldd_driver (err -22)
> 
> these functions are defined in lddbus and i have insmod lddbus.


Based on your description, you built two modules: lddbus and sculld.
sculld used the symbols exported in lddbus -- am I right? In this case,
you might want sculld to know these symbols via copying Module.symvers
file generated by the compilation of lddbus to sculld code directory
before building sculld. To make it clear:

	step 1.   build lddbus, generate `*.ko` and `Module.symvers`
	step 2.   copy `Module.symvers` located in lddbus directory
	          to sculld directory
	step 3.   build sculld

Just a mixture of guess and experiences... hope it can help!


All the best!
Freeman

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cannot insmod sculld in ldd3

[Tobin C. Harding]

On Fri, Mar 10, 2017 at 08:19:29PM +0330, Ali Aminian wrote:
> Hello
> when i try to insmod sculld insmod prints this error message:
> insmod: ERROR: could not insert module ./sculld.ko: Invalid parameters

What source code are you using. The is a port here

https://github.com/duxing2007/ldd3-examples-3.x

porting ldd3 source to modern kernels.

thanks,
Tobin.

> 
> i checked dmsg and it says:
> [12073.858764] sculld: no symbol version for unregister_ldd_driver
> [12073.858767] sculld: Unknown symbol unregister_ldd_driver (err -22)
> [12073.858780] sculld: no symbol version for register_ldd_device
> [12073.858781] sculld: Unknown symbol register_ldd_device (err -22)
> [12073.858789] sculld: no symbol version for unregister_ldd_device
> [12073.858790] sculld: Unknown symbol unregister_ldd_device (err -22)
> [12073.858794] sculld: no symbol version for register_ldd_driver
> [12073.858795] sculld: Unknown symbol register_ldd_driver (err -22)
> 
> these functions are defined in lddbus and i have insmod lddbus.
> 
> can anyone tell me what is wrong.
> thank you.
> 
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

-- 
Tobin Harding
http://tobin.cc

cannot insmod sculld in ldd3

[Ali Aminian]

Hello
I mean lddbus and sculld from the book "Linux Device Drivers, Third Edition".

Here I attached the codes.
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cannot insmod sculld in ldd3

[valdis.kletnieks at vt.edu]

On Fri, 10 Mar 2017 20:19:29 +0330, Ali Aminian said:

> these functions are defined in lddbus and i have insmod lddbus.
>
> can anyone tell me what is wrong.

Unless I'm getting senile, neither sculld or lddbus are in the current
mainline source tree, so you'll need to provide a pointer to your code
before you'll get help.

But the most likely thing is that your sculld module isn't
properly licensed.
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cannot insmod sculld in ldd3

[Ali Aminian]

Hello
when i try to insmod sculld insmod prints this error message:
insmod: ERROR: could not insert module ./sculld.ko: Invalid parameters

i checked dmsg and it says:
[12073.858764] sculld: no symbol version for unregister_ldd_driver
[12073.858767] sculld: Unknown symbol unregister_ldd_driver (err -22)
[12073.858780] sculld: no symbol version for register_ldd_device
[12073.858781] sculld: Unknown symbol register_ldd_device (err -22)
[12073.858789] sculld: no symbol version for unregister_ldd_device
[12073.858790] sculld: Unknown symbol unregister_ldd_device (err -22)
[12073.858794] sculld: no symbol version for register_ldd_driver
[12073.858795] sculld: Unknown symbol register_ldd_driver (err -22)

these functions are defined in lddbus and i have insmod lddbus.

can anyone tell me what is wrong.
thank you.