Re: [PATCH v3 0/7] Remove unneeded build directory traversals

On Wed, Mar 15, 2017 at 5:37 PM, Andrew F. Davis [off-list ref] wrote:

Hello all,

I was building a kernel for x86 and noticed Make still descended into
directories like drivers/gpu/drm/hisilicon, this seems kind of odd given
nothing will be built here. It looks to be due to some directories being
included in obj-y unconditionally instead of only when the relevant
CONFIG_ is set.

These patches are split by subsystem in-case, for some reason, a file in
a directory does need to be built, I believe I have checked for all
instances of this, but a quick review from some maintainers would be nice.

I didn't see anything wrong with the patches, and made sure that there
are no tristate symbols controlling the subdirectory for anything that
requires a built-in driver (which would cause a link failure).

I'm not sure about drivers/lguest, which has some special magic
in its Makefile, it's possible that this now fails with CONFIG_LGUEST=m.

      Arnd