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

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Message-ID: <20170321073156.12c0c0bc@gmail.com>
Date:   Tue, 21 Mar 2017 07:31:56 +0100
From:   Ralph Sennhauser <ralph.sennhauser@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        "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, 20 Mar 2017 14:51:31 +0100
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.
> 
> Thierry

What is a !PM configuration if not "# CONFIG_PWM is not set"
in .config? I'd really like to trigger those warnings myself
respectively understand where they come from.

Thanks
Ralph