On Thu, Jun 01, 2017 at 11:07:46AM +0200, Arnd Bergmann wrote:

On Thu, Jun 1, 2017 at 9:17 AM, Stephen Boyd [off-list ref] wrote:

quoted

On 05/23, Arnd Bergmann wrote:

quoted

On Tue, May 23, 2017 at 9:19 AM, Chen-Yu Tsai [off-list ref] wrote:
An alternative would be to remove all the dependencies as 'lib-y'
in the Makefile and remove the individual Kconfig symbols. That
way, we would always build all of them when CONFIG_SUNXI_CCU
is enabled, but the linker would drop the ones that do not get
referenced.

In this case you're right, and we should change them to lib-y in
the Makefile and then let the linker figure this all out. No more
dependency patches. I think we only need to do this sort of
Kconfig stuff when we want to make a library .ko file that each
SoC specific driver depends on for common code.

It would be cool if the build system could figure that all out
for us, and let us have something like modlib-y that makes it a
library (archive) if all objects depending on it are builtin and
we have CONFIG_MODULES=n, or makes it into an object file if
something is builtin that depends on it, or makes it into a
module if everything that depends on it is a module.

In this case, there are no loadable modules, the sunxi clk drivers
can only be built-in, which should simplify the problem a lot.

Using the linker to drop the useless stuff seems like a good idea. Do
you want to send a patch for it?

Maxim

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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