# \[PATCH 13/15\] fbdev: sh-mobile-lcdcfb: Enable driver compilation with COMPILE\_TEST

- From: Laurent Pinchart \<laurent.pinchart@ideasonboard.com\>
- Date: 2014-01-19 21:01:29 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2014/01/8672496
- Thread: https://ratatoskr.run/linux-arm-kernel/2013/11/8666809/t.md

```text
Hi Tomi,

On Friday 17 January 2014 11:00:58 Tomi Valkeinen wrote:
> Hi,
> 
> On 2014-01-08 10:30, Tomi Valkeinen wrote:
> > On 2014-01-07 17:15, Laurent Pinchart wrote:
> >> On Wednesday 11 December 2013 13:51:18 Laurent Pinchart wrote:
> >>> Hi Jean-Christophe and Tomi,
> >>> 
> >>> Could you please pick this patch up for v3.14 ?
> >> 
> >> Ping ?
> > 
> > Queued for 3.14.
> 
> I'll drop this patch, as it causes compile break (from kbuild test robot):
> 
> All error/warnings:
> 
>    drivers/built-in.o: In function `sh_mobile_lcdc_pan':
> >> sh_mobile_lcdcfb.c:(.text+0x77373): undefined reference to
> `sh_mobile_meram_cache_update'
>    drivers/built-in.o: In function `sh_mobile_lcdc_start':
> >> sh_mobile_lcdcfb.c:(.text+0x79320): undefined reference to
> `sh_mobile_meram_cache_free'
> >> sh_mobile_lcdcfb.c:(.text+0x79394): undefined reference to
> `sh_mobile_meram_cache_alloc'
> >> sh_mobile_lcdcfb.c:(.text+0x793d4): undefined reference to
> `sh_mobile_meram_cache_update'
>    drivers/built-in.o: In function `sh_mobile_lcdc_stop':
> >> sh_mobile_lcdcfb.c:(.text+0x79616): undefined reference to
> `sh_mobile_meram_cache_free'

The lcdc driver can be compiled without meram support. This is handled by 
conditional compilation in include/video/sh_mobile_meram.h that defines the 
meram functions as stubs when meram support isn't selected.

The problem comes from the combination of FB_SH_MOBILE_MERAM=m and 
FB_SH_MOBILE_LCDC=y. The former makes the meram function non-stubs, while the 
later makes the LCDC driver fail to link, as meram support is then compiled as 
a module.

How do you usually handle this ?

-- 
Regards,

Laurent Pinchart
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