* Writing framework in kernel
@ 2020-03-22 16:08 Tomek The Messenger
2020-03-22 16:37 ` Greg KH
0 siblings, 1 reply; 2+ messages in thread
From: Tomek The Messenger @ 2020-03-22 16:08 UTC (permalink / raw)
To: kernelnewbies
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Hi
I am writing some framework for my kernel drivers. I delegated to framework
the code which is common amongs all kernel drivers. So my framework module
core.c has none probe, remove functions. It has also none module_init,
module_exit functions at those are not needed.
1.) When I do modprobe of my core.ko I got error:
15.092976] testframework_core: module license 'unspecified' taints kernel.
[ 15.129532] testframework_core : Unknown symbol regmap_write (err 0)
[ 15.129554] testframework_core : Unknown symbol devm_kmalloc (err 0)
[ 15.129573] rstctl_core testframework_core : Unknown symbol
of_property_read_variable_u32_array (err 0)
[ 15.129598] testframework_core : Unknown symbol sysfs_remove_groups (err
0)
etc
So I suppose I need to put in my core.c line:
MODULE_LICENSE("GPL v2");
at the end of file in order to get rid of above problems. I will check if
it helps.
However when I am looking at build-in frameworks in linux kernel nobody put
line:
MODULE_LICENSE("GPL v2");
So why I have to and for example here:
https://elixir.bootlin.com/linux/latest/source/drivers/reset/core.c
there is none such line and everything works?
This is what I completely don't understand. My framework is external
module, maybe this is the reason???
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* Re: Writing framework in kernel
2020-03-22 16:08 Writing framework in kernel Tomek The Messenger
@ 2020-03-22 16:37 ` Greg KH
0 siblings, 0 replies; 2+ messages in thread
From: Greg KH @ 2020-03-22 16:37 UTC (permalink / raw)
To: Tomek The Messenger; +Cc: kernelnewbies
On Sun, Mar 22, 2020 at 05:08:15PM +0100, Tomek The Messenger wrote:
> Hi
> I am writing some framework for my kernel drivers. I delegated to framework
> the code which is common amongs all kernel drivers. So my framework module
> core.c has none probe, remove functions. It has also none module_init,
> module_exit functions at those are not needed.
> 1.) When I do modprobe of my core.ko I got error:
> 15.092976] testframework_core: module license 'unspecified' taints kernel.
> [ 15.129532] testframework_core : Unknown symbol regmap_write (err 0)
> [ 15.129554] testframework_core : Unknown symbol devm_kmalloc (err 0)
> [ 15.129573] rstctl_core testframework_core : Unknown symbol
> of_property_read_variable_u32_array (err 0)
> [ 15.129598] testframework_core : Unknown symbol sysfs_remove_groups (err
> 0)
> etc
>
> So I suppose I need to put in my core.c line:
> MODULE_LICENSE("GPL v2");
> at the end of file in order to get rid of above problems. I will check if
> it helps.
Yes, that is what you need to do here, you are trying to access symbols
that are GPL-only, and you did not specify the license of your module to
the kernel.
good luck!
greg k-h
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