linux-kernel - [PATCH] [v2] drm: select DRM_KMS_HELPER from DRM_GEM_SHMEM

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250122090211.3161186-1-arnd@kernel.org>
Date: Wed, 22 Jan 2025 10:02:03 +0100
From: Arnd Bergmann <arnd@...nel.org>
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: Arnd Bergmann <arnd@...db.de>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Jocelyn Falempe <jfalempe@...hat.com>,
	Jani Nikula <jani.nikula@...el.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] drm: select DRM_KMS_HELPER from DRM_GEM_SHMEM_HELPER

From: Arnd Bergmann <arnd@...db.de>

In the combination of DRM_KMS_HELPER=m, DRM_GEM_SHMEM_HELPER=y, DRM_FBDEV_EMULATION=y,
The shmem code fails to link against the KMS helpers:

x86_64-linux-ld: vmlinux.o: in function `drm_fbdev_shmem_driver_fbdev_probe':
(.text+0xeec601): undefined reference to `drm_fb_helper_alloc_info'
x86_64-linux-ld: (.text+0xeec633): undefined reference to `drm_fb_helper_fill_info'
x86_64-linux-ld: vmlinux.o: in function `drm_fbdev_shmem_get_page':
drm_fbdev_shmem.c:(.text+0xeec7d2): undefined reference to `drm_gem_fb_get_obj'
x86_64-linux-ld: vmlinux.o: in function `drm_fbdev_shmem_fb_mmap':
drm_fbdev_shmem.c:(.text+0xeec9f6): undefined reference to `drm_gem_fb_get_obj'
x86_64-linux-ld: vmlinux.o: in function `drm_fbdev_shmem_defio_imageblit':
(.rodata+0x5b2288): undefined reference to `drm_fb_helper_check_var'
x86_64-linux-ld: (.rodata+0x5b2290): undefined reference to `drm_fb_helper_set_par'

This can happen for a number of device drivers that select DRM_GEM_SHMEM_HELPER
without also selecting DRM_KMS_HELPER. To work around this, add another select
that forces DRM_KMS_HELPER to be built-in rather than a loadable module, but
only if FBDEV emulation is also enabled. DRM_TTM_HELPER and DRM_GEM_DMA_HELPER
look like they have the same problem in theory even if there is no possible
configuration that shows it. For consistency, do the same change to those.

Closes: https://lore.kernel.org/all/20250121-greedy-flounder-of-abundance-4d2ee8-mkl@pengutronix.de
Reported-by: Marc Kleine-Budde <mkl@...gutronix.de>
Tested-by: Marc Kleine-Budde <mkl@...gutronix.de>
Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/gpu/drm/Kconfig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 0fe99d440bfa..805c6c78498f 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -293,6 +293,7 @@ config DRM_TTM_HELPER
 	tristate
 	depends on DRM
 	select DRM_TTM
+	select DRM_KMS_HELPER if DRM_FBDEV_EMULATION
 	select FB_CORE if DRM_FBDEV_EMULATION
 	select FB_SYSMEM_HELPERS_DEFERRED if DRM_FBDEV_EMULATION
 	help
@@ -301,6 +302,7 @@ config DRM_TTM_HELPER
 config DRM_GEM_DMA_HELPER
 	tristate
 	depends on DRM
+	select DRM_KMS_HELPER if DRM_FBDEV_EMULATION
 	select FB_CORE if DRM_FBDEV_EMULATION
 	select FB_DMAMEM_HELPERS_DEFERRED if DRM_FBDEV_EMULATION
 	help
@@ -309,6 +311,7 @@ config DRM_GEM_DMA_HELPER
 config DRM_GEM_SHMEM_HELPER
 	tristate
 	depends on DRM && MMU
+	select DRM_KMS_HELPER if DRM_FBDEV_EMULATION
 	select FB_CORE if DRM_FBDEV_EMULATION
 	select FB_SYSMEM_HELPERS_DEFERRED if DRM_FBDEV_EMULATION
 	help
-- 
2.39.5