Linux kernel stable tree (mirror) https://git.radix-linux.su/kernel/linux.git/atom?h=v6.18.22 2025-09-15T10:29:37+00:00 2025-09-15T10:29:37+00:00 Nathan Chancellor nathan@kernel.org 2025-09-08T20:24:59+00:00 urn:sha1:0265d0ebb409a25d3bb3a19494e0173d06d9d132 When building with -Wincompatible-function-pointer-types-strict, a warning designed to catch kernel control flow integrity (kCFI) issues at build time, there is an instance in the new tiny DRM pixpaper driver: drivers/gpu/drm/tiny/pixpaper.c:982:16: error: incompatible function pointer types initializing 'enum drm_mode_status (*)(struct drm_crtc *, const struct drm_display_mode *)' with an expression of type 'int (struct drm_crtc *, const struct drm_display_mode *)' [-Werror,-Wincompatible-function-pointer-types-strict] 982 | .mode_valid = pixpaper_mode_valid, | ^~~~~~~~~~~~~~~~~~~ While 'int' and 'enum drm_mode_status' are ABI compatible, hence no regular warning from -Wincompatible-function-pointer-types, the mismatch will trigger a kCFI violation when pixpaper_mode_valid() is called indirectly. Update the return type of pixpaper_mode_valid() to be 'enum drm_mode_status' to clear up the warning and kCFI violation. Fixes: c9e70639f591 ("drm: tiny: Add support for Mayqueen Pixpaper e-ink panel") Signed-off-by: Nathan Chancellor <nathan@kernel.org> Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Link: https://lore.kernel.org/r/20250908-drm-pixpaper-fix-mode_valid-return-type-v1-1-705ceaf03757@kernel.org 2025-09-05T12:53:07+00:00 LiangCheng Wang zaq14760@gmail.com 2025-09-02T06:53:20+00:00 urn:sha1:c9e70639f5915f2d084a0126e62fe53a52c29cea Introduce a DRM driver for the Mayqueen Pixpaper e-ink display panel, which is controlled via SPI. The driver supports a 122x250 resolution display with XRGB8888 format. Also, add a MAINTAINERS entry for the Pixpaper driver. Signed-off-by: LiangCheng Wang <zaq14760@gmail.com> Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Link: https://lore.kernel.org/r/20250902-drm-v5-3-d77c678c4ae3@gmail.com