linux-kernel - Re: [PATCH v3 1/6] asus-wmi: Implement TUF laptop keyboard RGB control

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Message-ID: <CAHp75VepmbLv1cx2cS6gbe_prs+cHZ0DYjJNkcuOXxeJaCqDGw@mail.gmail.com>
Date:   Tue, 9 Aug 2022 11:29:27 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Luke Jones <luke@...nes.dev>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Barnabás Pőcze <pobrn@...tonmail.com>,
        Pavel Machek <pavel@....cz>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/6] asus-wmi: Implement TUF laptop keyboard RGB control

On Tue, Aug 9, 2022 at 10:56 AM Luke Jones <luke@...nes.dev> wrote:
> On Tue, Aug 9 2022 at 10:46:33 +0200, Andy Shevchenko
> <andy.shevchenko@...il.com> wrote:
> > On Tue, Aug 9, 2022 at 4:51 AM Luke D. Jones <luke@...nes.dev> wrote:

...

> >>  +       err = asus_wmi_evaluate_method3(ASUS_WMI_METHODID_DEVS,
> >> ASUS_WMI_DEVID_TUF_RGB_MODE,
> >>  +                               rgb->save | (rgb->mode << 8) | (r
> >> << 16) | (g << 24),
> >>  +                               (b) | (rgb->speed << 8),
> >
> > Too many parentheses.
>
> Uh, yeah. I was unable to find concrete info on this. I at one point
> experienced an issue where the order of operations *without*
> parentheses ended up as "x | y << (8 | z) << 16". But now I'm not even
> sure if I remember that correctly. I see the order here
> https://www.cs.uic.edu/~i109/Notes/COperatorPrecedenceTable.pdf
>
> I'll do as said and test it to be certain.

I'm talking about the '(b)' part. The rest is okay to me.

-- 
With Best Regards,
Andy Shevchenko