linux-kernel - Re: [PATCH] PM / clk: make PM clock layer compatible with clocks that must sleep

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Message-ID: <CAMuHMdULW4bnb0Jc0+ZaF9P2VNgnYsvEks7y8WYCk045BHqh7A@mail.gmail.com>
Date:   Thu, 21 Jan 2021 11:58:42 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Nicolas Pitre <npitre@...libre.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Linux PM <linux-pm@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] PM / clk: make PM clock layer compatible with clocks that
 must sleep

On Thu, Jan 21, 2021 at 10:13 AM Naresh Kamboju
<naresh.kamboju@...aro.org> wrote:
> On Tue, 5 Jan 2021 at 08:48, Nicolas Pitre <npitre@...libre.com> wrote:
> >
> > The clock API splits its interface into sleepable ant atomic contexts:
> >
> > - clk_prepare/clk_unprepare for stuff that might sleep
> >
> > - clk_enable_clk_disable for anything that may be done in atomic context
> >
>
> <trim>
>
> >
> > Signed-off-by: Nicolas Pitre <npitre@...libre.com>
> >
> > diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c
> > index ced6863a16..a62fb0f9b1 100644
> > --- a/drivers/base/power/clock_ops.c
> > +++ b/drivers/base/power/clock_ops.c
>
> <trim>
>
> > @@ -64,17 +166,20 @@ static void pm_clk_acquire(struct device *dev, struct pm_clock_entry *ce)
> >                 ce->clk = clk_get(dev, ce->con_id);
> >         if (IS_ERR(ce->clk)) {
> >                 ce->status = PCE_STATUS_ERROR;
> > +               return;
> > +       } else if (clk_is_enabled_when_prepared(ce->clk)) {
>
> arm-linux-gnueabihf-ld: drivers/base/power/clock_ops.o: in function
> `pm_clk_acquire':
> drivers/base/power/clock_ops.c:170: undefined reference to
> `clk_is_enabled_when_prepared'
>
> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
>
> This build error was noticed on arm architecture on linux next 20210121 tag.
> Following builds failed.
>  - arm (omap1_defconfig) with clang-10 - FAILED
>  - arm (omap1_defconfig) with clang-11 - FAILED
>
>  - arm (omap1_defconfig) with gcc-8 - FAILED
>  - arm (omap1_defconfig) with gcc-9 - FAILED
>  - arm (omap1_defconfig) with gcc-10 - FAILED

Missing dummy clk_is_enabled_when_prepared() for the
!CONFIG_HAVE_CLK case?

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