From: Greg KH <greg@kroah.com>
To: Tomek The Messenger <tomekthemessenger@gmail.com>
Cc: kernelnewbies@kernelnewbies.org
Subject: Re: Unknown symbol reboot_mode
Date: Mon, 23 Mar 2020 11:46:53 +0100 [thread overview]
Message-ID: <20200323104653.GA522243@kroah.com> (raw)
In-Reply-To: <CAA4NGyvS=wBr4+y+LFa0C+XbfGDhwesqMwk6aQ0TbVCjDHC_5A@mail.gmail.com>
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
_______________________________________________
Kernelnewbies mailing list
Kernelnewbies@kernelnewbies.org
https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
prev parent reply other threads:[~2020-03-23 10:48 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-23 10:27 Unknown symbol reboot_mode Tomek The Messenger
2020-03-23 10:46 ` Greg KH [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200323104653.GA522243@kroah.com \
--to=greg@kroah.com \
--cc=kernelnewbies@kernelnewbies.org \
--cc=tomekthemessenger@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.