About Kernel Modules in Linux

rajkumar278 · 06-09-2009, 03:37 AM

Hi all,

I am building the two kernel modules means 2 .ko files. Some functions of the module 1 are being used by module 2. I have also exported the symbols for functions which will be used by 2nd module. But When I am compiling the modules, i am getting the following errors:

WARNING: "A_UnRegister_Driver" [/usr/src/linux/drivers/usb/my/device/src/a.ko] undefined!
WARNING: "A_Free" [/usr/src/linux/drivers/usb/my/device/src/b.ko] undefined!

I am exporting the above function using the EXPORT_SYMBOL. Can some body point out why am i getting this and what is workaround for this?

regards.

TB0ne · 06-09-2009, 09:21 PM

Quote:

Originally Posted by rajkumar278

Hi all,

I am building the two kernel modules means 2 .ko files. Some functions of the module 1 are being used by module 2. I have also exported the symbols for functions which will be used by 2nd module. But When I am compiling the modules, i am getting the following errors:

WARNING: "A_UnRegister_Driver" [/usr/src/linux/drivers/usb/my/device/src/a.ko] undefined!
WARNING: "A_Free" [/usr/src/linux/drivers/usb/my/device/src/b.ko] undefined!

I am exporting the above function using the EXPORT_SYMBOL. Can some body point out why am i getting this and what is workaround for this?

regards.

Don't know how anyone but you can diagnose this problem. You don't say what modules you're trying to compile, on what version/distro of Linux. We can't guess as to what you're doing.......so post useful information.