First 5 patches convert us to %r0-31.
Next 12 convert make using R0-31 required in macros.
Last 2 convert instructions where ra = r0 we use 0 rather than the
register value (as suggested by Andreas).
Version 2 adds:
ra = 0 idea (as Andreas suggested)
Fixes for 32bit KVM (added ppc44x_defconfig to my testing)
Based on mpe's next tree which has Antons power7 copy patches which
needed fixes for this
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