linux-kernel - RE: [PATCH 2/3] leds: add LED Trigger for camera function

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Date:	Wed, 13 Mar 2013 23:16:01 +0000
From:	"Kim, Milo" <Milo.Kim@...com>
To:	Bryan Wu <cooloney@...il.com>
CC:	"linux-leds@...r.kernel.org" <linux-leds@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Jeong, Daniel" <Daniel.Jeong@...com>
Subject: RE: [PATCH 2/3] leds: add LED Trigger for camera function

> > +#if defined(CONFIG_LEDS_TRIGGER_CAMERA) ||
> defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE)
> > +extern void ledtrig_flash_ctrl(bool on);
> > +extern void ledtrig_torch_ctrl(bool on);
> > +#else
> > +#define ledtrig_flash_ctrl(x) do {} while(0)
> > +#define ledtrig_torch_ctrl(x) do {} while(0)
> 
> It's better don't use #define macros but use real empty functions like
> this:
> static inline void ledtrig_flash_ctrl(bool on)
> {
>         return;
> }

I agree, but other trigger functions are declared as do-while definition.
So I would let them unify if it's not critical.
I'd like to have your opinion, which is better.

Thanks,
Milo
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