linux-kernel - Re: [PATCH] applesmc: Re-work SMC comms v2

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Date:   Thu, 5 Nov 2020 09:15:47 +0100
From:   Andreas Kemnade <andreas@...nade.info>
To:     Henrik Rydberg <rydberg@...math.org>
Cc:     Brad Campbell <brad@...rfbargle.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>,
        Arnd Bergmann <arnd@...db.de>, linux-hwmon@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        hns@...delico.com
Subject: Re: [PATCH] applesmc: Re-work SMC comms v2

On Thu, 5 Nov 2020 08:56:04 +0100
Henrik Rydberg <rydberg@...math.org> wrote:

> Hi Brad,
> 
> Great to see this effort, it is certainly an area which could be 
> improved. After having seen several generations of Macbooks while 
> modifying much of that code, it became clear that the SMC communication 
> got refreshed a few times over the years. Every tiny change had to be 
> tested on all machines, or kept separate for a particular generation, or 
> something would break.
> 
> I have not followed the back story here, but I imagine the need has 
> arisen because of a new refresh, and so this patch only needs to 
> strictly apply to a new generation. I would therefore advice that you 
> write the patch in that way, reducing the actual change to zero for 
> earlier generations. It also makes it easier to test the effect of the 
> new approach on older systems. I should be able to help testing on a 
> 2008 and 2011 model once we get to that stage.
> 
Well, the issue has arisen because of a change in kernel to make clang
happy. So it is not a new Apple device causing trouble.

Regards,
Andreas