linux-kernel - [PATCH] drm/tiny: pixpaper: Fix missing dependency on DRM_GEM_SHMEM

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Message-Id: <20250922-bar-v1-1-b2a1f54ace82@gmail.com>
Date: Mon, 22 Sep 2025 10:57:34 +0800
From: LiangCheng Wang <zaq14760@...il.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 kernel test robot <lkp@...el.com>, LiangCheng Wang <zaq14760@...il.com>
Subject: [PATCH] drm/tiny: pixpaper: Fix missing dependency on
 DRM_GEM_SHMEM_HELPER

The driver uses drm_gem_shmem_prime_import_no_map() and
drm_gem_shmem_dumb_create(), but the Kconfig currently selects
DRM_GEM_DMA_HELPER instead of DRM_GEM_SHMEM_HELPER. This causes
link failures when DRM_GEM_SHMEM_HELPER is not enabled.

Select DRM_GEM_SHMEM_HELPER to fix the build.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202509220320.gfFZjmyg-lkp@intel.com/
Fixes: c9e70639f591 ("drm: tiny: Add support for Mayqueen Pixpaper e-ink panel")

Signed-off-by: LiangCheng Wang <zaq14760@...il.com>
---
This patch fixes a build failure in the Pixpaper DRM tiny driver caused by
a missing dependency on DRM_GEM_SHMEM_HELPER. The driver calls
drm_gem_shmem_prime_import_no_map() and drm_gem_shmem_dumb_create(), which
require CONFIG_DRM_GEM_SHMEM_HELPER to be enabled.

The issue was reported by the 0-day kernel test robot. This patch updates
the Kconfig to select DRM_GEM_SHMEM_HELPER instead of DRM_GEM_DMA_HELPER.
---
 drivers/gpu/drm/tiny/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig
index 94a5bf61a115929640022128e20c723ab7c0e735..7d9e85e932d7fd7bdb6ad7a4c6ba0f835841f623 100644
--- a/drivers/gpu/drm/tiny/Kconfig
+++ b/drivers/gpu/drm/tiny/Kconfig
@@ -86,7 +86,7 @@ config DRM_PIXPAPER
         tristate "DRM support for PIXPAPER display panels"
         depends on DRM && SPI
         select DRM_CLIENT_SELECTION
-        select DRM_GEM_DMA_HELPER
+        select DRM_GEM_SHMEM_HELPER
         select DRM_KMS_HELPER
         help
 	  DRM driver for the Mayqueen Pixpaper e-ink display panel.

---
base-commit: 846bd2225ec3cfa8be046655e02b9457ed41973e
change-id: 20250922-bar-cd1f3e834e78

Best regards,
-- 
LiangCheng Wang <zaq14760@...il.com>