Commit b750f5a9 authored by LiangCheng Wang's avatar LiangCheng Wang Committed by Thomas Zimmermann
Browse files

drm/tiny: pixpaper: add explicit dependency on MMU 



The DRM_GEM_SHMEM_HELPER helper requires MMU enabled because it uses
vmf_insert_pfn() in its mmap implementation. On NOMMU configurations
(e.g. some RISC-V randconfig builds), this symbol is unavailable and
selecting DRM_GEM_SHMEM_HELPER causes a modpost undefined reference:

    ERROR: modpost: "vmf_insert_pfn" [drivers/gpu/drm/drm_shmem_helper.ko] undefined!

Normally, Kconfig prevents this helper from being selected when
CONFIG_MMU=n. However, in some randconfig builds (such as those used by
0day CI), select statements can override unmet dependencies, triggering
the issue.

Add an explicit dependency on MMU to DRM_PIXPAPER to prevent this.

Reported-by: default avatarkernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202510280213.0rlYA4T3-lkp@intel.com/


Fixes: 0c4932f6 ("drm/tiny: pixpaper: Fix missing dependency on DRM_GEM_SHMEM_HELPER")
Acked-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: default avatarLiangCheng Wang <zaq14760@gmail.com>
Signed-off-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Link: https://patch.msgid.link/20251028-bar-v1-1-edfbd13fafff@gmail.com
parent 664ce102

drivers/gpu/drm/tiny/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -85,6 +85,7 @@ config DRM_PANEL_MIPI_DBI 
config DRM_PIXPAPER

        tristate "DRM support for PIXPAPER display panels"

        depends on DRM && SPI

        depends on MMU

        select DRM_CLIENT_SELECTION

        select DRM_GEM_SHMEM_HELPER

        select DRM_KMS_HELPER