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

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Date:	Fri, 15 Aug 2014 09:32:16 -0700
From:	Kevin Hilman <khilman@...aro.org>
To:	Juri Lelli <juri.lelli@....com>
Cc:	linux@....linux.org.uk,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Will Deacon <will.deacon@....com>,
	Chao Xie <chao.xie@...vell.com>,
	Stephen Warren <swarren@...dia.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Rob Herring <rob.herring@...xeda.com>,
	Jonathan Austin <Jonathan.Austin@....com>,
	Chao Xie Linux <xiechao.mail@...il.com>,
	Juri Lelli <juri.lelli@...il.com>, linux-pm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] cpuidle/cpuidle-big_little: fix reading cpu id part number

Juri Lelli <juri.lelli@....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@...aro.org>

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

Kevin
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