# Re: \[PATCH v12 4/6\] fbmon: add of\_videomode helpers

- From: Tomi Valkeinen \<hidden\>
- Date: 2012-11-21 16:47:53 
- List: linux-devicetree
- Page: https://ratatoskr.run/linux-devicetree/2012/11/8065928
- Thread: https://ratatoskr.run/linux-fbdev/2012/11/8065879/t.md

```text
On 2012-11-21 18:24, Steffen Trumtrar wrote:
> On Wed, Nov 21, 2012 at 02:49:30PM +0200, Tomi Valkeinen wrote:

>>> @@ -715,6 +717,11 @@ extern void fb_destroy_modedb(struct fb_videomode *modedb);
>>>  extern int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int rb);
>>>  extern unsigned char *fb_ddc_read(struct i2c_adapter *adapter);
>>>  
>>> +#if IS_ENABLED(CONFIG_OF_VIDEOMODE)
>>> +extern int of_get_fb_videomode(const struct device_node *np,
>>> +			       struct fb_videomode *fb,
>>> +			       unsigned int index);
>>> +#endif
>>>  #if IS_ENABLED(CONFIG_VIDEOMODE)
>>>  extern int fb_videomode_from_videomode(const struct videomode *vm,
>>>  				       struct fb_videomode *fbmode);
>>
>> Do you really need these #ifs in the header files? They do make it look
>> a bit messy. If somebody uses the functions and CONFIG_VIDEOMODE is not
>> enabled, he'll get a linker error anyway.
>>
> 
> Well, I don't remember at the moment who requested this, but it was not my
> idea to put them there. So, this is a matter of style I guess.
> But maybe I understood that wrong.

Right, one reviewer says this way, and another says that way =).

With the header files I've made I only use #ifs with #else, when I want
to give a static inline empty/no-op implementation for the function in
case the feature is not compiled into the kernel.

As you said, matter of taste. Up to you.

 Tomi


```

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