Question regarding building a specific kernel module.

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This may be slightly off topic, but I wasn't sure where else to post...

I want to use/modify a driver that my distribution has not built a
module for.

I'm using FC6 which doesn't install the src as standard so I:
1) Download the matching kernel SRPM from
http://download.fedora.redhat.com
2) $ rpm -ivh kernel-2.6.18-1.2798.fc6.src.rpm 
3) $ rpmbuild -bp --target=$(uname -m)
/usr/src/redhat/SPECS/kernel-2.6.spec

This puts the source in:
  /usr/src/redhat/BUILD/kernel-2.6.18/kernel-2.6.18.i686

OK, so I copy the original .config in using:
4) $ cd /usr/src/redhat/BUILD/kernel-2.6.18/ kernel-2.6.18.i686
5) $ cp /lib/modules/2.6.18-1.2798.fc6/build/.config  .
6) $ make gconfig
7) Find the driver I want and turn on its compile option to 'M'odule.

Now I try to build the module:
8) $ make modules

Naively I though that this would just compile the one module I wanted !
It actually seems to compile all modules (slow machine & still chugging
away).

QUESTIONS:
(A) Could I have done this differently so that only the module I wanted
got built?

(B) As part of some tests I'm doing I want to modify this one module and
recompile.  What should I do to make sure ONLY the module I changed gets
recompiled ? Will it just happen automagically ?  


Thanks
dom



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