Help with Kbuild to do user-API header split

[David Howells <dhowells@redhat.com>]

Hi,

I have some some patches here:

	http://git.infradead.org/users/dhowells/linux-headers.git

that split the user API out of the main kernel headers.  The patches are
committed on branch uapi-split and consist of two subsets:

 (1) master to tag uapi-prep-20120511

     These patches prepare for the UAPI split.

 (2) Tag uapi-prep-20120511 to tag uapi-post-split-20120511.

     These patches perform the UAPI split.

Note that most of these patches are generated by some perl scripts that I've
written.


The problem is that the first subset of patches modify the Kbuild stuff ready
for the second subset, but header installation then fails until all of the
second subset is applied.  So building make allyesconfig for x86_64 at the
first tag results in the following errors:

  INSTALL include/asm (3 files)
make[3]: *** No rule to make target `/data/fs/linux-2.6-uapi/usr/include/asm-generic/auxvec.h', needed by `/data/fs/linux-2.6-uapi/usr/include/asm-generic/.check'.  Stop.
make[2]: *** [asm-generic] Error 2
make[2]: *** Waiting for unfinished jobs....
make[3]: *** No rule to make target `/data/fs/linux-2.6-uapi/usr/include/drm/drm.h', needed by `/data/fs/linux-2.6-uapi/usr/include/drm/.check'.  Stop.
make[3]: *** make[2]: *** [drm] Error 2
No rule to make target `/data/fs/linux-2.6-uapi/usr/include/mtd/inftl-user.h', needed by `/data/fs/linux-2.6-uapi/usr/include/mtd/.check'.  Stop.
make[2]: *** [mtd] Error 2
make[3]: *** No rule to make target `/data/fs/linux-2.6-uapi/usr/include/rdma/ib_user_cm.h', needed by `/data/fs/linux-2.6-uapi/usr/include/rdma/.check'.  Stop.
make[2]: *** [rdma] Error 2
make[4]: *** No rule to make target `/data/fs/linux-2.6-uapi/usr/include/linux/byteorder/big_endian.h', needed by `/data/fs/linux-2.6-uapi/usr/include/linux/byteorder/.check'.  Stop.
make[3]: *** [byteorder] Error 2
make[3]: *** Waiting for unfinished jobs....
make[4]: *** No rule to make target `/data/fs/linux-2.6-uapi/usr/include/linux/caif/caif_socket.h', needed by `/data/fs/linux-2.6-uapi/usr/include/linux/caif/.check'.  Stop.
make[3]: *** [caif] Error 2
make[4]: *** No rule to make target `/data/fs/linux-2.6-uapi/usr/include/linux/can/bcm.h', needed by `/data/fs/linux-2.6-uapi/usr/include/linux/can/.check'.  Stop.
make[3]: *** [can] Error 2
make[4]: *** No rule to make target `/data/fs/linux-2.6-uapi/usr/include/linux/dvb/audio.h', needed by `/data/fs/linux-2.6-uapi/usr/include/linux/dvb/.check'.  Stop.
make[3]: *** [dvb] Error 2
make[2]: *** [linux] Error 2
make[1]: *** [headers_check] Error 2
make: *** [vmlinux] Error 2

I'm not sure of the best way to deal with this.  Possibly, the best way is just
to ignore it since it only affects header installation, and only in the middle
of this set of patches.

However, it would be nice to make it so that I can push the patches piecemeal
through the system.  That would allow me to push various individual
disintegration patches through the trees to which they pertain (so arch patches
through arch trees, for example).

Any suggestions?

David