class_device_create compilation errors.

[zoeken]

Hi
I am newbie to kernel programming. My kernel version is 2.6.27 i am getting compilation errors when compiling a module that
error: implicit declaration of function ‘class_device_create’
error: implicit declaration of function ‘class_device_destroy’
while the module is compiled successfully in 2.6.24.I need to know a way of doing it in 2.6.27 what are the essential headers for it?.

[digvijay.gahlot]

At root of your kernel sources do
#ctags -R * // It will take some time

It will generate a tags file. Watch for class_device_create and class_device_destroy
in that file. It is possible that in 2.6.27 these interfaces are no longer Exported so you are unable to compile the module.

But in 2.6.24 these interfaces were imported with
EXPORT_SYMBOL(class_device_create);
EXPORT_SYMBOL(class_device_destory);
macros respectively.

Checks for header files too

[zoeken]

Still not working.What headers should i include to make it work.

[digvijay.gahlot]

If the symbols are not exported u cann't access them. Look for alternative or modified/new interfaces which provide similar construct