* Unknown symbol reboot_mode
@ 2020-03-23 10:27 Tomek The Messenger
2020-03-23 10:46 ` Greg KH
0 siblings, 1 reply; 2+ messages in thread
From: Tomek The Messenger @ 2020-03-23 10:27 UTC (permalink / raw)
To: kernelnewbies
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Hi
When I insert external kernel module which is compiled out of tree I got
error:
root:/run# insmod ./my_module.ko
[ 137.443823] my_module: Unknown symbol reboot_mode (err 0)
I investigated that I have attached in my my_module.c file:
#include <linux/reboot.h>
and in this file we have:
extern enum reboot_mode reboot_mode;
However reboot_mode symbol is not exported with macro EXPORT_SYMBOL_GPL.
Probably this is the reason why symbol is not seen in my module. Then why
the same issue doesn't occur here:
/arch/arm/kernel/setup.c
/arch/arm64/kernel/process.c
Those linux files also use global variable reboot_mode.
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* Re: Unknown symbol reboot_mode
2020-03-23 10:27 Unknown symbol reboot_mode Tomek The Messenger
@ 2020-03-23 10:46 ` Greg KH
0 siblings, 0 replies; 2+ messages in thread
From: Greg KH @ 2020-03-23 10:46 UTC (permalink / raw)
To: Tomek The Messenger; +Cc: kernelnewbies
On Mon, Mar 23, 2020 at 11:27:50AM +0100, Tomek The Messenger wrote:
> Hi
> When I insert external kernel module which is compiled out of tree I got
> error:
>
> root:/run# insmod ./my_module.ko
> [ 137.443823] my_module: Unknown symbol reboot_mode (err 0)
>
> I investigated that I have attached in my my_module.c file:
> #include <linux/reboot.h>
> and in this file we have:
> extern enum reboot_mode reboot_mode;
> However reboot_mode symbol is not exported with macro EXPORT_SYMBOL_GPL.
> Probably this is the reason why symbol is not seen in my module.
That is correct.
> Then why
> the same issue doesn't occur here:
> /arch/arm/kernel/setup.c
> /arch/arm64/kernel/process.c
> Those linux files also use global variable reboot_mode.
Because those files are not built as a kernel module, but rather
directly into the kernel image.
hope this helps,
greg k-h
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