Module Installation Error Unknown Symbol Corrective Action

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In the past few days, some of our users have encountered an error code when inserting an unknown module symbol. This issue occurs due to a number of factors. Let’s discuss this now.

(a). Your initialization and completion functions should be declared slightly more static and properly identified. For example in m1.c –

  static int __init hello_start (void)     printk (KERN_INFO "Module M1 is loading ...  n");    func_m2 ();    return 0;static void __exit hello_end (void)    printk (KERN_INFO "unload m1 ...  n"); 

(b). Both build your modules together, the same makefile. I bet if you look closely at the output of your existing makefile, if you look at m1.c, you will see a warning that func_m2 () is undefined. In any case, its consolidated makefile should look like this:

  SRCS M1 = .c m2.cOBJS = $ (SRCS: .c = .o)obj-m + = $ (OBJS)EXTRA_CFLAGS means -O2Everything:   $ (MAKE) -C / lib / modules / `uname -r` / build M = module $ (PWD)clean:   $ (MAKE) -C / lib / modules / `uname -r` / build M = $ (PWD) clean    $ (RM) Module.marker module.order 

After creating two modules, run insmod ‘m2.ko’ before issuing insmod ‘m1 for.ko’. Check the results with dmesg.

Again, I’m assuming m1.c and m2.c are in the same directory. Although they are different in web directories, this method works, but this method becomes cumbersome. If theyare already in different directories, you will see the following.

I did some research and found a good way to put modules in separate directories. The example I used is indeed much simpler than I expected, but it could possibly be adapted.

I am getting the following manifest file in some ExportSymbol directory called …

  $ ls -CFR... :enable / Makefile mod1 / mod2 /./contain:m2_func.h./mod1:Makefile module1.c./mod2:Makefile module2.c 

  #ifndef M2_FUNC_H#define M2_FUNC_Hvoid m2_func (empty);#end if 

  obj-y: = mod1 / mod2 /Everything:    $ (MAKE) -C / lib / modules / `uname -r` / build M = module $ (PWD)clean:    $ (MAKE) -C / lib / modules / `uname -r` / build M = $ (PWD) clean    $ (RM) Module.marker module.order 

  SRCS implies module1.cOBJS = $ (SRCS: .c = .o)obj-m + = $ (OBJS)EXTRA_CFLAGS + = -I $ PWD / enableEverything:    $ (MAKE) -C -r` / build / lib / modules / `uname M = $ (PWD) moduleclean:    $ (MAKE) -C -r` / build / lib / modules / `uname M = $ (PWD) clean    $ (RM) Module.marker module.order 

---

  #include #include static __init int hello_start (void) printk (KERN_INFO "segment m1 is loading ...  n"); m2_func (); Returns 0;statically useless __exit printk (KERN_INFO hello_end (void) "Unload m1 ...  n");module_init (hello_start);module_exit (hello_end);MODULE_LICENSE ("GPL"); 

  SRCS = module2.cOBJS matches $ (SRCS: .c = .o)obj-m + = $ (OBJS)EXTRA_CFLAGS + = -I $ PWD / enableEverything:    $ (MAKE) -C -r` / build / lib / modules / `uname M = $ (PWD) moduleclean:    $ (MAKE) -C -r` / build / lib / modules / `uname M = $ (PWD) clean    $ (RM) Module.marker module.order 

---

  #include "m2_func.h"#include #include static int __init hello_start (void) printk (KERN_INFO "the m2 module is being loaded ...  n"); Visit 0;static void __exit hello_end (void) "Unloading printk (KERN_INFO m2 ...  n");void m2_func (void) printk (KERN_INFO "This is process m2  n"); module_init (hello_start);module_exit (hello_end);MODULE_LICENSE ("GPL");EXPORT_SYMBOL (m2_func); 

NOTE. I cannot use your Makefile because it creates * .ko for every c file. The Makefile does the job. The “kb” file is the core file for the product; You will have one for any .c source file. There is no class for this. If you need less than a few KB files, put every bit of code in the root file.

Configured a taxi driver according to the documentation. But when I try to overcome them

. load

  insmod onebox_wlan_nongpl.ko 

insmod: Error: unable to insert segment onebox_wlan_nongpl.ko: Unknownsymbol in a module

I understand this is due to the wrong structure for loading .ko files, but it doesn’t tell me which module it really depends on. I would like to know what is usually unknown in order to archive the module that I need to load in the first place.

At this point, I prefer not to use the Modprobe for which it is sold.
I want to use the insmod command instead.

The reason I asked all the time is because I really want to install (view) devices in / dev, no matter what devices are actually connected or not.

I tried using another dedicated Linux Kernel Module (LKM) application that outputs as XX.ko.
The aim of this LKM is virtual device integration.
I tried to fill in the KB file of this LMB. It has been installed successfully.

This is why I like to use insmod for our pc driver. I think I need to charge.
I have tried using below

• pcmcia,
  park,
  i2c-algo-bit

Or is there a way to virtually charge your devices yourself Are you in trial mode?

  root @ rosmaster: /home/usr/work/peak-linux-driver-8.10.2/driver#insmod pcan.ERROR: koinsmod: unable to insert course pcan.ko: unknown symbol in module 

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Oshibka Pri Vstavke Neizvestnogo Simvola Modulya
Erro Ao Inserir O Simbolo Desconhecido Do Modulo
Error Insertando Modulo Simbolo Desconocido
Errore Durante L Inserimento Del Simbolo Sconosciuto Del Modulo
Fel Vid Insattning Av Modul Okand Symbol
Erreur D Insertion Du Symbole Inconnu Du Module
모듈을 알 수 없는 기호를 삽입하는 동안 오류가 발생했습니다
Fehler Beim Einfugen Des Unbekannten Modulsymbols
Fout Bij Invoegen Module Onbekend Symbool
Blad Wstawiania Modulu Nieznany Symbol