On Mon, 2016-11-21 at 10:14:33 UTC, Michael Ellerman wrote:
> Back in 2005 when the ppc/ppc64 merge started, we used to build the
> kernel code in arch/powerpc but use the boot code from arch/ppc or
> arch/ppc64 depending on whether we were building for 32 or 64-bit.
>
> Originally we called the boot Makefile passing ARCH=$(OLDARCH), where
> OLDARCH was ppc or ppc64.
>
> In commit 20f629549b30 ("powerpc: Make building the boot image work for
> both 32-bit and 64-bit") (2005-10-11) we split the call for 32/64-bit
> using an ifeq check, because the two Makefiles took different targets,
> and explicitly passed ARCH=ppc64 for the 64-bit case and ARCH=ppc for
> the 32-bit case.
>
> Then in commit 94b212c29f68 ("powerpc: Move ppc64 boot wrapper code over
> to arch/powerpc") (2005-11-16) we moved the boot code into arch/powerpc
> and dropped the ppc case, but kept passing ARCH=ppc64 to
> arch/powerpc/boot/Makefile.
>
> Since then there have been several more boot targets added, all of which
> have copied the ARCH=ppc64 setting, such that now we have four targets
> using it.
>
> Currently it seems that nothing actually uses the ARCH value, but that's
> basically just luck, and in particular it prevents us from using the
> generic cpp_lds_S rule. It's also clearly wrong, ARCH=ppc64 is dead,
> buried and cremated.
>
> Fix it by dropping the setting of ARCH completely, the correct value is
> exported by the top level Makefile.
>
> Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
Series applied to powerpc next.
https://git.kernel.org/powerpc/c/1196d7aaebf6cdad619310fe283422
cheers
