On Sat, Dec 8, 2012 at 3:03 AM, Yann Droneaud [off-list ref] wrote:

Le vendredi 07 d?cembre 2012 ? 20:44 +0200, Kevin Wilson a ?crit :

quoted

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)

why? is that creates a linker errs while your module uses some symbols
that are not exported?

Regards.

--
Yann Droneaud
OPTEYA



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