linux-kernel - Re: [PATCH 1/4] gpio: mvebu: Add limited PWM support

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Date:   Thu, 23 Mar 2017 11:11:09 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Ralph Sennhauser <ralph.sennhauser@...il.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        Andrew Lunn <andrew@...n.ch>, Imre Kaloz <kaloz@...nwrt.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        "open list:PWM SUBSYSTEM" <linux-pwm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] gpio: mvebu: Add limited PWM support

On Mon, Mar 20, 2017 at 2:51 PM, Thierry Reding
<thierry.reding@...il.com> wrote:
> On Fri, Mar 17, 2017 at 10:17:47AM +0100, Ralph Sennhauser wrote:
>> On Thu, 16 Mar 2017 17:03:05 +0100
>> Linus Walleij <linus.walleij@...aro.org> wrote:
> [...]
>> > > +static void mvebu_pwm_suspend(struct mvebu_gpio_chip *mvchip)
>> > > +static void mvebu_pwm_resume(struct mvebu_gpio_chip *mvchip)
>> >
>> > I think both of these need to be tagged __maybe_unused to not give
>> > noise in randconfig builds.
>>
>> I haven't seen any warnings with CONFIG_PWM disabled. Which
>> configuration you expect to trigger a warning? mvebu_pwm_probe should
>> be the same, right?
>
> It's got nothing to do with CONFIG_PWM and as far as I can tell your
> usage of IS_ENABLED() is fine here. However, if you try building the
> driver with a !PM configuration, both *_suspend() and *_resume() end
> up being unused and giving you a warning.

Yes I was referring to the !PM case.

Those are not found by zeroday builds.

But they are found a couple of days later by Arnd Bergmann running
randconfig builds.

Yours,
Linus Walleij