Latest build results - errors/warnings - lots of them

[Dave Martin]

On Tue, Apr 30, 2013 at 11:12:12AM -0400, Nicolas Pitre wrote:
> On Tue, 30 Apr 2013, Dave Martin wrote:
> 
> > On Tue, Apr 30, 2013 at 01:04:20PM +0200, Arnd Bergmann wrote:
> > > On Tuesday 30 April 2013, Russell King - ARM Linux wrote:
> > > > Latest nightly build of 3.9+my for-next+arm-soc's for-next results in a
> > > > great load of new warnings and errors.  arch/arm/common/mcpm_head.S,
> > > > arch/arm/common/mcpm_platsmp.c, arch/arm/common/vlock.S are the biggest
> > > > source of errors.
> > 
> > [...]
> >  
> > > >arch/arm/common/mcpm_head.S:39: Error: selected processor does not support ARM mode `ubfx r9,r0,#0,#8'
> > > >arch/arm/common/mcpm_head.S:40: Error: selected processor does not support ARM mode `ubfx r10,r0,#8,#8'
> > > >arch/arm/common/mcpm_head.S:100: Error: selected processor does not support ARM mode `dmb'
> > > >arch/arm/common/mcpm_head.S:115: Error: selected processor does not support ARM mode `dmb'
> > > >arch/arm/common/mcpm_head.S:127: Error: selected processor does not support ARM mode `dmb'
> > > >arch/arm/common/mcpm_head.S:131: Error: selected processor does not support ARM mode `dmb'
> > > >arch/arm/common/mcpm_head.S:138: Error: selected processor does not support ARM mode `dsb'
> > > >arch/arm/common/mcpm_head.S:152: Error: selected processor does not support ARM mode `dmb'
> > > >arch/arm/common/mcpm_head.S:161: Error: selected processor does not support ARM mode `dmb'
> > > >arch/arm/common/mcpm_head.S:175: Error: selected processor does not support ARM mode `dmb'
> > > >arch/arm/common/vlock.S:62: Error: selected processor does not support ARM mode `dmb'
> > > >arch/arm/common/vlock.S:72: Error: selected processor does not support ARM mode `dmb'
> > > >arch/arm/common/vlock.S:72: Error: selected processor does not support ARM mode `dsb'
> > > >arch/arm/common/vlock.S:89: Error: selected processor does not support ARM mode `dmb'
> > > >arch/arm/common/vlock.S:95: Error: selected processor does not support ARM mode `dmb'
> > > >arch/arm/common/vlock.S:95: Error: selected processor does not support ARM mode `dsb'
> > > >arch/arm/common/vlock.S:102: Error: selected processor does not support ARM mode `dmb'
> > > >arch/arm/common/vlock.S:105: Error: selected processor does not support ARM mode `dsb'
> > > 
> > > Right, the problem here is that the code was never tested with an ARMv6+ARMv7 config.
> > > We can either fix it up by adding
> > > 
> > > 	.arch	armv7-a
> > > 
> > > in the assembly files, or by doing the same in the Makefile:
> > > 
> > > AFLAGS_vlock.S += -march=armv7-a
> > > AFLAGS_mcpm_head.S += -march=armv7-a
> > 
> > 
> > Hmmm, this code was tested with ARCH_MULTIPLATFORM, but it looks like
> > no v6 boards were configured in when testing that...
> > 
> > 
> > Assuming people are OK with the Makefile route, here's a patch for that,
> > build-tested with a v6+v7 ARCH_MULTIPLATFORM config.
> 
> Isn't the .arch armv7-a route a bit cleaner?  That would have been my 
> choice, although I don't feel strongly about it.

I don't feel strongly either.  We already have the CFLAGS_DISABLE stuff,
so it didn't feel that unnatural to add this in the Makefile; but .arch
would work equally well.

If somebody wants to change it, it's not a problem for me, but I didn't
want to create extra disruption by proposing a different patch...

Cheers
---Dave