linux-kernel - [PATCH v2 1/1] gpu: drm: fix compilation errors in drm_vram

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Message-ID: <20250730071002.2697-2-chuguangqing@inspur.com>
Date: Wed, 30 Jul 2025 15:09:18 +0800
From: chuguangqing <chuguangqing@...pur.com>
To: <lkp@...el.com>, <maarten.lankhorst@...ux.intel.com>,
	<mripard@...nel.org>, <tzimmermann@...e.de>, <airlied@...il.com>,
	<simona@...ll.ch>
CC: <llvm@...ts.linux.dev>, <oe-kbuild-all@...ts.linux.dev>,
	<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
	chuguangqing <chuguangqing@...pur.com>
Subject: [PATCH v2 1/1] gpu: drm: fix compilation errors in drm_vram_helper

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 select CONFIG_DRM_TTM_HELPER on CONFIG_DRM_VRAM_HELPER to resolve the undefined symbol errors.

Signed-off-by: chuguangqing <chuguangqing@...pur.com>
---
 drivers/gpu/drm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index f7ea8e895c0c..01a314fdc9a8 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -226,6 +226,7 @@ config DRM_BUDDY
 config DRM_VRAM_HELPER
 	tristate
 	depends on DRM
+	select DRM_TTM_HELPER if DRM_VRAM_HELPER != n
 	help
 	  Helpers for VRAM memory management
 
-- 
2.43.5