linux-kernel - Re: [PATCH v3 0/8] ARM: sun9i: SMP and CPU hotplug support

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Date:   Tue, 16 Jan 2018 12:24:02 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Russell King <linux@...linux.org.uk>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Dave Martin <Dave.Martin@....com>
Subject: Re: [PATCH v3 0/8] ARM: sun9i: SMP and CPU hotplug support

On Tue, Jan 16, 2018 at 5:00 AM, Nicolas Pitre <nicolas.pitre@...aro.org> wrote:
> On Mon, 15 Jan 2018, Chen-Yu Tsai wrote:
>
>> Changes since v2:
>>   - Do away with the MCPM framework, directly implement smp_ops
>>   - Some debug messages were clarified
>>   - New ARCH_SUNXI_MCPM Kconfig symbol for this feature
>
> You should use ARCH_SUNXI_SMP instead to avoid confusion with the actual
> MCPM code. Ditto for function names as Dave mentioned.

All switched to "MC_SMP". There is existing, albeit deprecated, SMP code
for single cluster SoCs, so "multi cluster" is desired to differentiate
from the old stuff.

> For the ARM to Thumb switch you could add something like this at the
> beginning of your entry code:
>
> #ifdef CONFIG_THUMB2_KERNEL
>         .arm
>         mov     ip, #1
>         bx      ip
>         .thumb
> #endif
>         [your code follows here]
>
> And make sure that code is word aligned.

Thanks for the tip. As I mentioned in my reply to Dave,
this wasn't really needed.

Thanks again!
ChenYu