[PATCH 00/14] Fix issues with ARMv6+v6k+v7 kernels

[Russell King - ARM Linux]

On Wed, Feb 09, 2011 at 08:24:21AM -0800, Tony Lindgren wrote:
> * Santosh Shilimkar <santosh.shilimkar at ti.com> [110209 01:59]:
> > > From: Dave Martin [mailto:dave.martin at linaro.org]
> > >
> > > You could also have a "v7+" unified kernel -- i.e., supporting
> > > OMAP3+4+SMP.
> > > This is what we currently do in Linaro, since we're focusing on v7
> > > and above.
> > >
> > This sounds good way forward considering future OMAP architectures
> > as well.
> > 
> > But I let Tony comment on this idea.
> 
> AFAIK these issues will be hopefully sorted out by the time the
> next merge window opens. For the -rc cycle, disabling SMP in
> config if ARMv6 is selected should do the trick.

That's not soo easy - as we don't know in the Kconfig whether we include
ARMv6 rather than ARMv6K.  It's exactly the same problem I ran into which
inflated the v6v7 patchset.

Maybe the best thing to do is:

config CPU_32v6K
        bool "Support ARM V6K processor extensions" if !SMP
        depends on CPU_V6 || CPU_V7
        default y if SMP && !(ARCH_MX3 || ARCH_OMAP2)

drop the ' && !(ARCH_MX3 || ARCH_OMAP2)' and just let people run into the
resulting undefined instruction traps if they try to run the kernel on
V6 non-K hardware.  Not ideal, but I don't see any other 'simple' solution
to this.