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

Thomas Zimmermann
2026-03-04T08:43:47Z

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.

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");

--
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)