ARM errata 430973 on multi platform kernels

[Russell King - ARM Linux]

On Mon, Apr 06, 2015 at 08:14:30PM +0200, Matthijs van Duin wrote:
> * Ivaylo Dimitrov <ivo.g.dimitrov.75 at gmail.com> [150406 10:15]:
> > Why custom function, if IBE bit is zero, BTB invalidate instruction is a
> > NOP. Do you think that "mcr p15, 0, r2, c7, c5, 6" executed as a NOP will
> > put so much overhead, that it deserves a custom function?
> 
> Executing them as nop is Cortex-A8 specific. On other ARMv7 CPUs, BTB
> invalidation on context switch may be unnecessary yet expensive.

That can be solved (see the patch I just posted) so I wouldn't worry
too much about that issue.

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