linux-kernel - Re: [PATCH v5 02/10] pinctrl: generic: Add macros to unpack properties

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Date:   Fri, 28 Apr 2017 12:06:39 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Chris Brandt <chris.brandt@...esas.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 02/10] pinctrl: generic: Add macros to unpack properties

On Fri, Apr 28, 2017 at 10:16 AM, Linus Walleij
<linus.walleij@...aro.org> wrote:
> On Thu, Apr 27, 2017 at 10:19 AM, Jacopo Mondi
>> +#define PIN_CONF_UNPACK_PARAM(c) ((c) & 0xffUL)
>> +#define PIN_CONF_UNPACK_ARGS(c) ((c) >> 8)
>
> But why.
>
> I have these two static inlines just below your new macros:
>
> static inline enum pin_config_param pinconf_to_config_param(unsigned
> long config)
> {
>         return (enum pin_config_param) (config & 0xffUL);
> }
>
> static inline u32 pinconf_to_config_argument(unsigned long config)
> {
>         return (u32) ((config >> 8) & 0xffffffUL);
> }

Cool, need...more...context...in...patches ;-)

> Why can't you use this in your code instead of macros?
>
> We generally prefer static inlines over macros because they are easier
> to read.

Sure.

Thanks for noticing!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds