linux-kernel - Re: [PATCH 2/2] armv8: aarch32: Add SMP support for 32-bit Linux kernel

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Date:   Fri, 23 Sep 2016 13:29:21 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Alison Wang <b18965@...escale.com>
Cc:     shawnguo@...nel.org, kernel@...gutronix.de, fabio.estevam@....com,
        linux@...linux.org.uk, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, scott.wood@....com,
        stuart.yoder@....com, leoyang.li@....com, jason.jin@....com
Subject: Re: [PATCH 2/2] armv8: aarch32: Add SMP support for 32-bit Linux
 kernel

On Fri, Sep 23, 2016 at 10:19:06AM +0800, Alison Wang wrote:
> The patch adds SMP support for running 32-bit Linux kernel for
> Layerscape platforms. Spin-table method is used for SMP support.

So far, spin-table has not been defined for 32-bit, and the code below,
while mostly a copy of the 64-bit code, is somewhat different.

If you want a common enable method, I would strongly advise that you use
PSCI, which is well-defined for both 32-bit and 64-bit. There are a
number of problems with spin-table, and I would not recommend extending
it to 32-bit ARM.

Thanks,
Mark.