global date via module howto

[M. Warner Losh]

In message: <44E87CCD.30105 at inse.ru>
            Roman Kurakin <rik at inse.ru> writes:
:     I have the following problem:
: module A
:     int x;
: 
: module B
:     extern int x;
: 
:     Module A is loaded, module B can't be loaded cause of unknow 'x'.
: What should I do to make x global?

Better to make module B depend on module A.  Making it global is
generally a bad idea.

in module A:
MODULE_VERSION(A, 1);

In module B:
MODULE_DEPEND(B, A, 1, 1, 1);

Warner

: PS. I am working on porting irda support for USB devices from NetBSD.
: The current model consists of two layers hw and sw. hw is the usb device
: driver. sw is some software layer the same for all device and it is a
: child on top of hw 'bus'. To make this working I need to add
: DRIVER_MODULE for each 'bus'. To make sw independent from the
: bus I need to export _driver and _class structures and put DRIVER_MODULE
: in 'bus' code instead of 'child'.

Are you sure that you need to do this?  I'm pretty sure that you can
create a base class irdabus and then derive all the hw modules that
implement irdabus from than and all the children will automatically
probe.  No need to export the driver/class structures.

Warner