Unknown symbol reboot_mode

Tomek The Messenger tomekthemessenger at gmail.com
Mon Mar 23 06:27:50 EDT 2020

When I insert external kernel module which is compiled out of tree I got

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:
Those linux files also use global variable reboot_mode.
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