Subject: Re: arm build failures (Was: linux-next: triage for March 13, 2012)

From: Tony Breeds <[email-masked]>
Date: Wed, 14 Mar 2012 15:29:44 +1100

On Wed, Mar 14, 2012 at 11:41:15AM +1100, Stephen Rothwell wrote:
> On Tue, 13 Mar 2012 19:47:07 -0400 Paul Gortmaker <[email-masked]> wrote:
> >
> > ARM:netx_defconfig,pnx4008_defconfig 
> > 	when:	Mar 14, 02:43
> > 	why:	net/core/pktgen.c: can't find a register in class 'GENERAL_REGS'
> > 	status:	
> > 	fix:	
> > 	ref:	http://kisskb.ellerman.id.au/kisskb/buildresult/5869486/
> 
> This is this:
> 
> net/core/pktgen.c:682:2775: error: can't find a register in class 'GENERAL_REGS' while reloading 'asm'
> net/core/pktgen.c:682:3153: error: can't find a register in class 'GENERAL_REGS' while reloading 'asm'
> net/core/pktgen.c:682:2775: error: 'asm' operand has impossible constraints
> net/core/pktgen.c:682:3153: error: 'asm' operand has impossible constraints
> 
> Which is a do_div() call.  The relevant code does not appear to have
> changed, so this may well be a result of our toolchain changing from
> "arm-linux-gcc (GCC) 4.4.0, GNU ld (GNU Binutils) 2.19.1" to
> "arm-unknown-linux-gnueabi-gcc (GCC) 4.6.3, GNU ld (GNU Binutils) 2.22".

Just for reference I build that code with:
arm-unknown-linux-gnueabi-gcc (GCC) 4.5.2, GNU ld (GNU Binutils) 2.21
and it was fine so I don't think it's to do with the switch from 
arm-linux-gcc to arm-unknown-linux-gnueabi-gcc[1]

Yours Tony

[1] This switchwas done as a result off the discussion at: http://lists.infradead.org/pipermail/linux-arm-kernel/2010-November/030627.html