On Debian, abs_srctree points to /usr/share/linux-headers-x.y-common,
which doesn't have generated arch-specific headers. We previously ran
into a similar problem in kernel-cflags-finder regarding expanding
includes in the right directory (see the comment in b6378909).
abs_objtree seems to work but I'm not sure that's reliable, it sounds
like it's usable for out-of-tree builds in some fashion. CURDIR would
work, but since we're using KDIR in the parent Makefile which does a
make -C $(KDIR), we may as well export and use that variable.
On Debian, abs_srctree points to /usr/share/linux-headers-x.y-common, which doesn't have generated arch-specific headers. We previously ran into a similar problem in kernel-cflags-finder regarding expanding includes in the right directory (see the comment in b6378909).
abs_objtree seems to work but I'm not sure that's reliable, it sounds like it's usable for out-of-tree builds in some fashion. CURDIR would work, but since we're using KDIR in the parent Makefile which does a
make -C $(KDIR), we may as well export and use that variable.