Please CC me to responses as I'm not subscribed to LKML.  Also, this is 
my first kernel patch, advise is certainly welcome.

For something I'm working on I have the need to answer the question, 
"given a hardware ID, does Linux distro X have a driver to support this 
hardware?" and more specifically, "which drivers support this hardware?" 
I can, generally speaking, get this data from files like 
/lib/modules/*/modules.alias.  However, this does not work for drivers 
built into the kernel.  With that in mind, I've cooked up a little proof 
of concept. Basically, its a sysfs file 
/sys/modules/$module/drivers/$driver/modalias that, when read, contains 
modalias-style filters for this driver.

The attached patch only does this for PCI drivers, each subsystem would 
need a patch like this.  Is this idea crazy?  Is there a better 
implementation?

Thanks!

Nathaniel McCallum