Unknown symbol reboot_mode
greg at kroah.com
Mon Mar 23 06:46:53 EDT 2020
On Mon, Mar 23, 2020 at 11:27:50AM +0100, Tomek The Messenger wrote:
> 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.
That is correct.
> Then why
> the same issue doesn't occur here:
> 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,
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