linux-kernel - Re: [PATCH v9 3/3] mmc: Add driver for LiteX's LiteSDCard interface

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Date:   Mon, 10 Jan 2022 09:25:58 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     "Gabriel L. Somlo" <gsomlo@...il.com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        Karol Gugala <kgugala@...micro.com>,
        Mateusz Holenko <mholenko@...micro.com>,
        Kamil Rakoczy <krakoczy@...micro.com>,
        mdudek@...ernships.antmicro.com,
        Paul Mackerras <paulus@...abs.org>,
        Joel Stanley <joel@....id.au>,
        Stafford Horne <shorne@...il.com>,
        david.abdurachmanov@...ive.com,
        Florent Kermarrec <florent@...oy-digital.fr>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH v9 3/3] mmc: Add driver for LiteX's LiteSDCard interface

Hi Gabriel,

On Sun, Jan 9, 2022 at 1:26 AM Gabriel L. Somlo <gsomlo@...il.com> wrote:
> On Sat, Jan 08, 2022 at 07:43:19PM +0200, Andy Shevchenko wrote:
> > On Sat, Jan 8, 2022 at 6:11 PM Gabriel Somlo <gsomlo@...il.com> wrote:
> > > +       u32 div;
> > > +
> > > +       div = freq ? host->ref_clk / freq : 256U;
> >
> > > +       div = roundup_pow_of_two(div);
> > > +       div = clamp(div, 2U, 256U);
> >
> > Not sure why it becomes two lines again.
>
> Per my previous email, I have:
>
>         div = clamp((u32)roundup_pow_of_two(div), 2U, 256U);
>
> ... lined up for v10 (pending also Geert's OK on the (u32) cast
> to shut up compiler warnings) :)

JFY (as you decided to keep the two separate lines), this is
exactly why clamp_t()exists: to avoid the explicit cast.

i.e.

    div = clamp_t(u32, roundup_pow_of_two(div), 2U, 256U);

or

    div = clamp_t(u32, roundup_pow_of_two(div), 2, 256);

(the implicit cast is applied to all parameters).

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