linux-kernel - Re: [PATCH 1/1] gpu: drm: fix compilation errors in drm_vram

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Message-ID: <d20ea5f0-737e-48a7-8311-fba8474bfd7a@suse.de>
Date: Mon, 11 Aug 2025 14:48:02 +0200
From: Thomas Zimmermann <tzimmermann@...e.de>
To: chuguangqing <chuguangqing@...pur.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] gpu: drm: fix compilation errors in drm_vram_helper

Hi

Am 29.07.25 um 08:07 schrieb chuguangqing:
> We encountered the following errors while compiling drm_vram_helper.ko
>
> ERROR: modpost: "drm_gem_ttm_print_info" [drivers/gpu/drm/drm_vram_helper.ko] undefined!
> ERROR: modpost: "drm_gem_ttm_mmap" [drivers/gpu/drm/drm_vram_helper.ko] undefined!
>
> The functions drm_gem_ttm_mmap and drm_gem_ttm_print_info are defined in drm_gem_ttm_helper.c. This patch adds drm_gem_ttm_helper.o to DRM_VRAM_HELPER to resolve the undefined symbol errors.

You need to select DRM_TTM_HELPER for your driver.

Best regards
Thomas

>
> Signed-off-by: chuguangqing <chuguangqing@...pur.com>
> ---
>   drivers/gpu/drm/Makefile | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 4dafbdc8f86a..abbe32ddf6d0 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -125,7 +125,7 @@ drm_suballoc_helper-y := drm_suballoc.o
>   obj-$(CONFIG_DRM_SUBALLOC_HELPER) += drm_suballoc_helper.o
>   
>   drm_vram_helper-y := drm_gem_vram_helper.o
> -obj-$(CONFIG_DRM_VRAM_HELPER) += drm_vram_helper.o
> +obj-$(CONFIG_DRM_VRAM_HELPER) += drm_vram_helper.o drm_gem_ttm_helper.o
>   
>   drm_ttm_helper-y := drm_gem_ttm_helper.o
>   drm_ttm_helper-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fbdev_ttm.o

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)