Re: [PATCH] drm/i915/fbdev: fix link failure without FBDEV emulation

[Jani Nikula <jani.nikula@linux.intel.com>]

On Mon, 16 Mar 2026, Thomas Zimmermann <tzimmermann@suse.de> wrote:
> Hi
>
> Am 04.03.26 um 09:43 schrieb Thomas Zimmermann:
>> Hi
>>
>> Am 04.03.26 um 09:36 schrieb Arnd Bergmann:
>>> From: Arnd Bergmann <arnd@arndb.de>
>>>
>>> If CONFIG_DRM_FBDEV_EMULATION is disabled but CONFIG_FRAMEBUFFER_CONSOLE
>>> is turned on, the i915 driver now fails to link:
>>>
>>> ERROR: modpost: "intel_fbdev_fb_prefer_stolen" 
>>> [drivers/gpu/drm/i915/i915.ko] undefined!
>>>
>>> Fix the contition to include a check for the symbol that controls 
>>> compilation
>>> of intel_fbdev_fb.c.
>>>
>>> Fixes: 94c7d2861292 ("drm/i915/fbdev: Extract 
>>> intel_fbdev_fb_prefer_stolen()")
>>> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
>>> ---
>>>   drivers/gpu/drm/i915/i915_initial_plane.c | 3 ++-
>>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/gpu/drm/i915/i915_initial_plane.c 
>>> b/drivers/gpu/drm/i915/i915_initial_plane.c
>>> index 5594548f51d8..390a9248d631 100644
>>> --- a/drivers/gpu/drm/i915/i915_initial_plane.c
>>> +++ b/drivers/gpu/drm/i915/i915_initial_plane.c
>>> @@ -115,7 +115,8 @@ initial_plane_vma(struct drm_i915_private *i915,
>>>        * important and we should probably use that space with FBC or 
>>> other
>>>        * features.
>>>        */
>>> -    if (IS_ENABLED(CONFIG_FRAMEBUFFER_CONSOLE) &&
>>> +    if (IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION) &&
>>> +        IS_ENABLED(CONFIG_FRAMEBUFFER_CONSOLE) &&
>>
>> It's possible to run fbdev without the console. So if I'm not 
>> mistaken, only CONFIG_DRM_FBDEV_EMULATION would be correct.
>
> Did anyone pick up this fix?

Pushed to drm-intel-next, thanks for the patch.

BR,
Jani.

>
> Best regards
> Thomas
>
>>
>> Best regards
>> Thomas
>>
>>
>>>           mem == i915->mm.stolen_region &&
>>>           !intel_fbdev_fb_prefer_stolen(&i915->drm, size)) {
>>>           drm_dbg_kms(&i915->drm, "Initial FB size exceeds half of 
>>> stolen, discarding\n");
>>

-- 
Jani Nikula, Intel