linux-kernel - Re: [PATCH] powerpc/32: Move the old 6xx -mcpu logic before the TARGET

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Date:   Tue, 4 Dec 2018 22:28:11 +0100
From:   Christophe LEROY <christophe.leroy@....fr>
To:     Mathieu Malaterre <malat@...ian.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/32: Move the old 6xx -mcpu logic before the
 TARGET_CPU logic



Le 04/12/2018 à 21:53, Mathieu Malaterre a écrit :
> The code:
> 
>    ifdef CONFIG_6xx
>    KBUILD_CFLAGS          += -mcpu=powerpc
>    endif
> 
> was added in 2006 in commit f48b8296b315 ("[PATCH] powerpc32: Set cpu
> explicitly in kernel compiles"). This change was acceptable since the
> TARGET_CPU logic was 64-bit only.
> 
> Since commit 0e00a8c9fd92 ("powerpc: Allow CPU selection
> also on PPC32") this logic is no longer acceptable after the TARGET_CPU
> specific. It currently appends -mcpu=powerpc at the end of the command
> line, after any TARGET_CPU specific:
> 
>    gcc -Wp,-MD,init/.do_mounts.o.d ...
>      -mcpu=powerpc -mbig-endian -m32 ...
>      -mcpu=e300c2 ...
>      -mcpu=powerpc ...
>      ../init/do_mounts.c
> 
> Cc: Christophe Leroy <christophe.leroy@....fr>
> Fixes: 0e00a8c9fd92 ("powerpc: Allow CPU selection also on PPC32")
> Suggested-by: Michael Ellerman <mpe@...erman.id.au>
> Link: https://www.mail-archive.com/linuxppc-dev@lists.ozlabs.org/msg142315.html
> Signed-off-by: Mathieu Malaterre <malat@...ian.org>
> ---
>   arch/powerpc/Makefile | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
> index 8a2ce14d68d0..544b30667ea5 100644
> --- a/arch/powerpc/Makefile
> +++ b/arch/powerpc/Makefile
> @@ -30,6 +30,10 @@ endif
>   endif
>   endif
>   
> +ifdef CONFIG_6xx
> +KBUILD_CFLAGS		+= -mcpu=powerpc
> +endif
> +

Could you make the patch on top of my serie (ie after the change of 
CONFIG_6xx to CONFIG_BOOK3S_32 ?

The serie is in origin/next-test

Thanks,
Christophe

>   ifeq ($(CROSS_COMPILE),)
>   KBUILD_DEFCONFIG := $(shell uname -m)_defconfig
>   else
> @@ -241,10 +245,6 @@ KBUILD_CFLAGS	+= $(call cc-option,-fno-dwarf2-cfi-asm)
>   # often slow when they are implemented at all
>   KBUILD_CFLAGS		+= $(call cc-option,-mno-string)
>   
> -ifdef CONFIG_6xx
> -KBUILD_CFLAGS		+= -mcpu=powerpc
> -endif
> -
>   cpu-as-$(CONFIG_4xx)		+= -Wa,-m405
>   cpu-as-$(CONFIG_ALTIVEC)	+= $(call as-option,-Wa$(comma)-maltivec)
>   cpu-as-$(CONFIG_E200)		+= -Wa,-me200
>