linux-kernel - Re: [RFC PATCH v4 2/2] clk: Use devm

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Message-ID: <CAMuHMdVYghD_xLeXVFD+PGBKECSkQ+_KxPBwFmUDDO3W5skscQ@mail.gmail.com>
Date:   Mon, 2 Mar 2020 11:14:21 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Marc Gonzalez <marc.w.gonzalez@...e.fr>
Cc:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Russell King <linux@...linux.org.uk>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Robin Murphy <robin.murphy@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rafael Wysocki <rjw@...ysocki.net>,
        Suzuki Poulose <suzuki.poulose@....com>,
        Mark Rutland <mark.rutland@....com>,
        linux-clk <linux-clk@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v4 2/2] clk: Use devm_add in managed functions

Hi Marc,

On Mon, Mar 2, 2020 at 11:01 AM Marc Gonzalez <marc.w.gonzalez@...e.fr> wrote:
> On 27/02/2020 14:36, Geert Uytterhoeven wrote:
> > On Wed, Feb 26, 2020 at 4:55 PM Marc Gonzalez <marc.w.gonzalez@...e.fr> wrote:
> >> Using the helper produces simpler code, and smaller object size.

> >> --- a/drivers/clk/clk-devres.c
> >> +++ b/drivers/clk/clk-devres.c

> >> @@ -128,30 +109,22 @@ static int devm_clk_match(struct device *dev, void *res, void *data)
> >>
> >>  void devm_clk_put(struct device *dev, struct clk *clk)
> >>  {
> >> -       int ret;
> >> -
> >> -       ret = devres_release(dev, devm_clk_release, devm_clk_match, clk);
> >> -
> >> -       WARN_ON(ret);
> >> +       WARN_ON(devres_release(dev, my_clk_put, devm_clk_match, clk));
> >
> > Getting rid of "ret" is an unrelated change, which actually increases
> > kernel size, as the WARN_ON() parameter is stringified for the warning
> > message.
>
> Weird... Are you sure about that? I built the preprocessed file,
> and it didn't appear to be so.
>
> #ifndef WARN_ON
> #define WARN_ON(condition) ({                                           \
>         int __ret_warn_on = !!(condition);                              \
>         if (unlikely(__ret_warn_on))                                    \
>                 __WARN();                                               \
>         unlikely(__ret_warn_on);                                        \
> })
> #endif
>
> Maybe you were thinking of i915's WARN_ON?
>
> #define WARN_ON(x) WARN((x), "%s", "WARN_ON(" __stringify(x) ")")

Oops, you're right.  I got trapped again by an override of a standard macro
(IMHO this should be removed).

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