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Mon, 23 Mar 2020 06:46:55 -0400 (EDT) Date: Mon, 23 Mar 2020 11:46:53 +0100 From: Greg KH To: Tomek The Messenger Subject: Re: Unknown symbol reboot_mode Message-ID: <20200323104653.GA522243@kroah.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Cc: kernelnewbies@kernelnewbies.org X-BeenThere: kernelnewbies@kernelnewbies.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Learn about the Linux kernel List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kernelnewbies-bounces+kernelnewbies=archiver.kernel.org@kernelnewbies.org 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 > 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