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

Kukjin Kim kgene.kim at samsung.com
Tue Jul 15 11:00:12 PDT 2014

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

> 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 at samsung.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...


More information about the linux-arm-kernel mailing list