linux-kernel - Re: [PATCH 2/2] hid: add PM support to PicoLCD device

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Message-ID: <alpine.LNX.2.00.1004272256160.9849@pobox.suse.cz>
Date:	Tue, 27 Apr 2010 22:57:11 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
Cc:	Oliver Neukum <oliver@...kum.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, Nicu Pavel <npavel@...ner.com>,
	Jaya Kumar <jayakumar.lkml@...il.com>,
	"Rick L. Vinyard Jr." <rvinyard@...nmsu.edu>
Subject: Re: [PATCH 2/2] hid: add PM support to PicoLCD device

On Tue, 27 Apr 2010, Bruno Prémont wrote:

> > > +#ifdef CONFIG_PM
> > > +static void picolcd_suspend_backlight(struct picolcd_data *data)
> > > +{
> > > +	int bl_power = data->lcd_power;
> > > +	if (!data->backlight)
> > > +		return;
> > > +
> > > +	data->backlight->props.power = FB_BLANK_POWERDOWN;
> > > +	picolcd_set_brightness(data->backlight);
> > > +	data->lcd_power = data->backlight->props.power = bl_power;
> > > +}
> > > +#else
> > > +#define picolcd_suspend_backlight(a)
> > > +#endif /* CONFIG_PM */
> > 
> > Stylistic thing -- it would be nice if this was actually 
> > 
> > static inline void picolcd_suspend_backlight(struct picolcd_data *data)
> > {
> > 	return 0;
> > }
> > 
> > But why do you need to have it defined in !CONFIG_PM situation anyway? 
> > It's not used otherwise at all.
> 
> Yeah, I could drop the #else branch (of #ifconfig CONFIG_PM).

Yup, please do so.

> Is gcc quiet about defined but unused static inline functions?

Yup, -Wunused-function doesn't warn about unused static inline function.

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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