linux-kernel - Re: [PATCH 2/6] ARM: EXYNOS: Fix core ID used by platsmp and hotplug code

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Message-ID: <53C56C2C.8010801@samsung.com>
Date:	Wed, 16 Jul 2014 03:00:12 +0900
From:	Kukjin Kim <kgene.kim@...sung.com>
To:	Tomasz Figa <tomasz.figa@...il.com>
CC:	Kukjin Kim <kgene.kim@...sung.com>,
	'Tomasz Figa' <t.figa@...sung.com>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	'Marek Szyprowski' <m.szyprowski@...sung.com>
Subject: Re: [PATCH 2/6] ARM: EXYNOS: Fix core ID used by platsmp and hotplug
 code

On 07/14/14 18:50, Tomasz Figa wrote:
> Hi Kukjin,
>
Hi,

> On 08.07.2014 15:21, Kukjin Kim wrote:
>> Tomasz Figa wrote:
>>>
>>> When CPU topology is specified in device tree, cpu_logical_map() does
>>> not return core ID anymore, but rather full MPIDR value. This breaks
>>> existing calculation of PMU register offsets on Exynos SoCs.
>>>
>>> This patch fixes the problem by adjusting the code to use only core ID
>>> bits of the value returned by cpu_logical_map() to allow CPU topology to
>>> be specified in device tree on Exynos SoCs.
>>>
>>> Signed-off-by: Tomasz Figa<t.figa@...sung.com>
>>
>> Looks good to me, but I think we don't need this fix in 3.16 because the CPU
>> topology is not specified in DT yet...if I'm wrong, please correct me.
>
> CPU topology is already specified in DT for Exynos3250, 5250, 5260, 5410
> and 5420/5800.
>
> This patch also fixes CPU hotplug on SoCs with more than 2 cores,
> because it removes incorrect condition check in platform_do_lowpower().
>
> Please take this fix for next -rc release.
>
Agreed and I've applied this into fixes for 3.16...

Thanks,
Kukjin
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