[PATCH 1/2] powerpc: Add ppc32_allmodconfig defconfig target

[Mathieu Malaterre]

On Mon, Jul 9, 2018 at 4:24 PM Michael Ellerman <mpe at ellerman.id.au> wrote:
>
> Because the allmodconfig logic just sets every symbol to M or Y, it
> has the effect of always generating a 64-bit config, because
> CONFIG_PPC64 becomes Y.
>
> So to make it easier for folks to test 32-bit code, provide a phony
> defconfig target that generates a 32-bit allmodconfig.
>
> The 32-bit port has several mutually exclusive CPU types, we choose
> the Book3S variants as that's what the help text in Kconfig says is
> most common.

Ok then.

> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
> ---
>  arch/powerpc/Makefile                 | 5 +++++
>  arch/powerpc/configs/book3s_32.config | 2 ++
>  2 files changed, 7 insertions(+)
>  create mode 100644 arch/powerpc/configs/book3s_32.config
>
> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
> index 2ea575cb3401..2556c2182789 100644
> --- a/arch/powerpc/Makefile
> +++ b/arch/powerpc/Makefile
> @@ -354,6 +354,11 @@ mpc86xx_smp_defconfig:
>         $(call merge_into_defconfig,mpc86xx_basic_defconfig,\
>                 86xx-smp 86xx-hw fsl-emb-nonhw)
>
> +PHONY += ppc32_allmodconfig
> +ppc32_allmodconfig:
> +       $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
> +               -f $(srctree)/Makefile allmodconfig
> +

I this a good time to update line 34 at the same time:

KBUILD_DEFCONFIG := $(shell uname -m)_defconfig

?

>  define archhelp
>    @echo '* zImage          - Build default images selected by kernel config'
>    @echo '  zImage.*        - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
> diff --git a/arch/powerpc/configs/book3s_32.config b/arch/powerpc/configs/book3s_32.config
> new file mode 100644
> index 000000000000..8721eb7b1294
> --- /dev/null
> +++ b/arch/powerpc/configs/book3s_32.config
> @@ -0,0 +1,2 @@
> +CONFIG_PPC64=n
> +CONFIG_PPC_BOOK3S_32=y
> --
> 2.14.1
>