[PATCH 2/3] arm64: Add big.LITTLE switcher stub

This all gets a bit circular though - the more patches people have to
carry to make upstream useful to them less useful working with upstream
seems to them, meaning the devices are less likely to appear upstream at
all at least in any sort of complete form.  One out of tree patch being
required isn't going to be a deal breaker by itself but they all add up
to a perception that upstream isn't useful.

There's definitely some taste considerations with how far you go to
cater for such systems - in this case I'd say it's just tweaking Kconfig
to allow people to use code that's already present rather than adding
really new code (there's the stubs but they're pretty insubstantial)
which means upstream doesn't have to carry anything that wasn't there
already.

Agree, with the original version of this patch I just put all the stubs in drivers/cpufreq/arm_big_little.h to get around needing to add files to arm64 (when it shouldn't need it). At least then the stubs were pretty local to the implementation and didn't require all of the ifdefs in the code (as Mark says that looks horrible).

Mark