Add a dependency on CONFIG_MMU to ofdrm. The driver uses GEM SHMEM helpers, which require MMU support. A reported error message [1] is shown below. arm-linux-gnueabi-ld: drivers/gpu/drm/drm_gem_shmem_helper.o: in function `drm_gem_shmem_fault': >> drivers/gpu/drm/drm_gem_shmem_helper.c:562: undefined reference to `vmf_insert_pfn' Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Fixes: c8a17756c425 ("drm/ofdrm: Add ofdrm for Open Firmware framebuffers") Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: Javier Martinez Canillas <javierm@redhat.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Maxime Ripard <maxime@cerno.tech> Cc: "Noralf Trønnes" <noralf@tronnes.org> Cc: Danilo Krummrich <dakr@redhat.com> Cc: Michal Suchanek <msuchanek@suse.de> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://lore.kernel.org/dri-devel/202210192029.ZFeJvqjv-lkp@intel.com/ # [1] Link: https://patchwork.freedesktop.org/patch/msgid/20221101104049.15601-1-tzimmermann@suse.de
Linux kernel ============ There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. The formatted documentation can also be read online at: https://www.kernel.org/doc/html/latest/ There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.
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