linux-kernel - Re: [Suggestion] PowerPC: kernel: cross compiling issue with allmodconfig

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Date:	Fri, 15 Mar 2013 15:52:54 +1100
From:	Michael Neuling <mikey@...ling.org>
To:	Chen Gang <gang.chen@...anux.com>, sfr@...b.auug.org.au
cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"paulus@...ba.org" <paulus@...ba.org>, matt@...abs.org,
	imunsie@....ibm.com, linuxppc-dev@...ts.ozlabs.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Suggestion] PowerPC: kernel: cross compiling issue with allmodconfig

>   do next-* tree support powerpc POWER7 with allmodconfig ?
> 
>   I met an issue, can we bear it (or I need additional trying) ?
> 
> 
> Compiling:
>   make V=1 EXTRA_CFLAGS=-W ARCH=powerpc allmodconfig
>     set cpu type POWER7 in menuconfig.
>     set cross-compiler in menuconfig.
>       under Fedora 16 x86_64 laptop
>       /usr/bin/powerpc64-linux-gnu-gcc -v
>         gcc version 4.7.1 20120606 (Red Hat 4.7.1-0.1.20120606) (GCC)
> 
> Issue:
>   error:
>     /android/public-kernel/linux-next/arch/powerpc/kernel/exceptions-64s.S: Assembler messages:
>     /android/public-kernel/linux-next/arch/powerpc/kernel/exceptions-64s.S:1304: Error: attempt to move .org backwards
> 
>   command:
>     powerpc64-linux-gnu-gcc -m64 -Wp,-MD,arch/powerpc/kernel/.head_64.o.d  -nostdinc -isystem /usr/lib/gcc/powerpc64-linux-gnu/4.7.1/include -I/android/public-kernel/linux-next/arch/powerpc/include -Iarch/powerpc/include/generated  -I/android/public-kernel/linux-next/include -Iinclude -I/android/public-kernel/linux-next/arch/powerpc/include/uapi -Iarch/powerpc/include/generated/uapi -I/android/public-kernel/linux-next/include/uapi -Iinclude/generated/uapi -include /android/public-kernel/linux-next/include/linux/kconfig.h -D__KERNEL__  -I/android/public-kernel/linux-next/arch/powerpc -Iarch/powerpc -D__ASSEMBLY__  -I/android/public-kernel/linux-next/arch/powerpc -Iarch/powerpc -Wa,-maltivec -gdwarf-2   -c -o arch/powerpc/kernel/head_64.o /android/public-kernel/linux-next/arch/powerpc/kernel/head_64.S
> 
>   (head_64.S includes exceptions-64.S)

Yep it's a known problem but no one has bothered to fix it since it
doesn't happen in a config that anyone cares about like
pseries_defconfig and ppc64_defconfig.  We've been moving code around in
this area a lot recently hence the breakage.

It should be fixed though.  Patches welcome. :-)

Mikey
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