[aarch64-port-dev ] RFR: Add support for A53 multiply accumulate feature

[Steve Capper]

Hi Ed,
I think it's best to err on the side of caution and assume that the
nop is always needed whenever you have fewer "CPU part" lines than
"processor" lines.

That way you don't have to worry about detecting other big.LITTLE
platforms, and with newer kernels (3.19 upwards), we will have a "CPU
part" line for each cpu.
It is very likely that this newer /proc/cpuinfo[1], will be backported
to distro kernels, so please don't check the kernel version number
(just look for the "CPU part" lines).

The MIDR and REVIDR registers are not currently exported to user
space. If that changes, I'll sling that information to this list.

Cheers,
--
Steve

[1] - https://git.kernel.org/cgit/linux/kernel/git/arm64/linux.git/commit/?h=for-next/core&id=44b82b7700d05a52cd983799d3ecde1a976b3bed