linux-kernel - Re: 2.6.24-rc1-git15 Kernel build fails on powerpc

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Message-ID: <20071106154439.GK5080@shadowen.org>
Date:	Tue, 6 Nov 2007 15:44:39 +0000
From:	Andy Whitcroft <apw@...dowen.org>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	linuxppc-dev@...abs.org, johannes@...solutions.net,
	sam@...nborg.org, David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.24-rc1-git15 Kernel build fails on powerpc - Unrecognized opcode: `dssall'

On Tue, Nov 06, 2007 at 07:09:40PM +0530, Balbir Singh wrote:
> Kamalesh Babulal wrote:
> > David Miller wrote:
> >> From: Johannes Berg <johannes@...solutions.net>
> >> Date: Tue, 06 Nov 2007 11:54:46 +0100
> >>
> >>>>>   CHK     include/linux/compile.h
> >>>>>   AS      arch/powerpc/kernel/swsusp_32.o
> >>>>> arch/powerpc/kernel/swsusp_32.S: Assembler messages:
> >>>>> arch/powerpc/kernel/swsusp_32.S:138: Error: Unrecognized opcode: `dssall'
> >>>>> make[1]: *** [arch/powerpc/kernel/swsusp_32.o] Error 1
> >>>>> make: *** [arch/powerpc/kernel] Error 2
> >>>>>
> >>>> Looks suspiciously like an altivec issue. Could you compile with make
> >>>> V=1 and/or do a git bisect and see what broke?
> >>> Looks more like a toolchain issue to me.
> >> Or, this is another instance of the "CFLAGS environment variable"
> >> problem.
> >>
> >> For a few days, the kbuild stuff would integrate any CFLAGS,
> >> AFLAGS, etc. settings you might have set in your environment.
> > 
> > Hi Balbir,
> > 
> > The Build error of kernel compilation with V=1
> > 
> > make -f scripts/Makefile.build obj=arch/powerpc/kernel
> > make -f scripts/Makefile.build obj=arch/powerpc/kernel/vdso32
> >   gcc -m32 -Wp,-MD,arch/powerpc/kernel/.swsusp_32.o.d  -nostdinc -isystem /usr/lib/gcc/ppc64-redhat-linux/4.1.2/include -D__KERNEL__ -Iinclude  -include include/linux/autoconf.h -Iarch/powerpc -D__ASSEMBLY__ -Iarch/powerpc -Wa,-m405 -gdwarf-2     -c -o arch/powerpc/kernel/swsusp_32.o arch/powerpc/kernel/swsusp_32.S
> > arch/powerpc/kernel/swsusp_32.S: Assembler messages:
> > arch/powerpc/kernel/swsusp_32.S:138: Error: Unrecognized opcode: `dssall'
> > make[1]: *** [arch/powerpc/kernel/swsusp_32.o] Error 1
> > make: *** [arch/powerpc/kernel] Error 2
> > 
> 
> I looked at your .config and now your  build. It looks like you select
> CONFIG_4xx (I see -Wa,-m405) and compile swsusp_32.S. The
> compiler/toolchain does not enable altivec instructions for CONFIG_4xx.
> If CONFIG_HIBERNATION is enabled as in your case, it compiles
> swsusp_32.S which assumes that ALTIVEC is enabled (see CPU_FTR_ALTIVEC).
> 
> You ideally need to have -Wa,-maltivec passed in your CFLAGS.

So that sounds like a Kconfig problem then?  That HIBERATION requires
ALITIVEC and yet does not depend on it or set it.

-apw
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