[PATCH v2] cpuidle/cpuidle-big_little: fix reading cpu id part number

[Kevin Hilman]

Juri Lelli <juri.lelli at arm.com> writes:

> Commit af040ffc9ba1 ("ARM: make it easier to check the CPU part number
> correctly") changed ARM_CPU_PART_X masks, and the way they are returned and
> checked against. Usage of read_cpuid_part_number() is now deprecated, and
> calling places updated accordingly. This actually broke cpuidle-big_little
> initialization, as bl_idle_driver_init() performs a check using an hardcoded
> mask on cpu_id.
>
> Create an interface to perform the check (that is now even easier to read).
> Define also a proper mask (ARM_CPU_PART_MASK) that makes this kind of checks
> cleaner and helps preventing bugs in the future. Update usage accordingly.

[...]

Tested-by: Kevin Hilman <khilman at linaro.org>

FWIW, I can confirm that this patch is needed for cpuidle-big_little to
work on the Exynos5800/Chromebook2.

Kevin