question about building a module

[ydroneaud@opteya.com (Yann Droneaud)]

Le vendredi 07 d?cembre 2012 ? 20:44 +0200, Kevin Wilson a ?crit :
> Hi,
> 
> 
> I am adding some code of my own **only** under 
> net/bluetooth in some file there.
> 
> 
> There is only exactly one module which is changed by my addition,
> This is net/bluetooth/bluetooth.ko
> 
> 
> Now, when I run 'make -j2 modules' it takes quite a time, even If I 
> did one change in one line in a file under net/bluetooth.
> 
> 
> I assume that it has to do with stage 2 of the build, which says
> something about 
> ...
>   Building modules, stage 2.
>   MODPOST 855 modules
> ...
> see below full log.
> 
> 
> Now my question is this:
> Is there a way to make things more efficent when building a module, on
> the 
> assumption that I do not change anything anywhere
> except /net/bluetooth (in this case)?
> 
> 
> somehow telling the MODPOST  that only one module is changes ? 
> 
> 
> I remember I once saw (not sure) a suggestion to build only a
> specified moule like: 
> make net/bluetooth
> But in this case the result is the same.
> 

cd net/bluetooth
make -C $PWD/../../ M=$PWD modules

(But if you change a configuration parameter in .config,
you will need to do a full build)

Regards.

-- 
Yann Droneaud
OPTEYA