From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ralph Sennhauser <ralph.sennhauser@gmail.com>
Subject: Re: [PATCH 1/4] gpio: mvebu: Add limited PWM support
Date: Tue, 21 Mar 2017 07:31:56 +0100
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To: Thierry Reding <thierry.reding@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>, "linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>, Andrew Lunn <andrew@lunn.ch>, Imre Kaloz <kaloz@openwrt.org>, Alexandre Courbot <gnurou@gmail.com>, Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, "David S. Miller" <davem@davemloft.net>, Geert Uytterhoeven <geert+renesas@glider.be>, Mauro Carvalho Chehab <mchehab@kernel.org>, Andrew Morton <akpm@linux-foundation.org>, Guenter Roeck <linux@roeck-us.net>, "open list:PWM SUBSYSTEM" <linux-pwm@vger.kernel.org>, "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" <devicetree@vger.kernel.org>, open list <linux-kernel@vger.kernel.org>
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On Mon, 20 Mar 2017 14:51:31 +0100
Thierry Reding <thierry.reding@gmail.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@linaro.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