linux-kernel - [PATCH] [v2] drm: rework FB

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Message-Id: <20241115162323.3555229-1-arnd@kernel.org>
Date: Fri, 15 Nov 2024 17:23:10 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Thomas Zimmermann <tzimmermann@...e.de>
Cc: Arnd Bergmann <arnd@...db.de>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Jocelyn Falempe <jfalempe@...hat.com>,
	Javier Martinez Canillas <javierm@...hat.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Jani Nikula <jani.nikula@...el.com>,
	Harry Wentland <harry.wentland@....com>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Jonathan Cavitt <jonathan.cavitt@...el.com>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] drm: rework FB_CORE dependency

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

The 'select FB_CORE' statement moved from CONFIG_DRM to DRM_CLIENT_LIB,
but there are now configurations that have code calling into fb_core
as built-in even though the client_lib itself is a loadable module:

x86_64-linux-ld: drivers/gpu/drm/drm_fbdev_shmem.o: in function `drm_fbdev_shmem_driver_fbdev_probe':
drm_fbdev_shmem.c:(.text+0x1fc): undefined reference to `fb_deferred_io_init'
x86_64-linux-ld: drivers/gpu/drm/drm_fbdev_shmem.o: in function `drm_fbdev_shmem_fb_destroy':
drm_fbdev_shmem.c:(.text+0x2e1): undefined reference to `fb_deferred_io_cleanup'
...
x86_64-linux-ld: drivers/gpu/drm/drm_fb_helper.o: in function `drm_fb_helper_set_suspend':
drm_fb_helper.c:(.text+0x2c6): undefined reference to `fb_set_suspend'
x86_64-linux-ld: drivers/gpu/drm/drm_fb_helper.o: in function `drm_fb_helper_resume_worker':
drm_fb_helper.c:(.text+0x2e1): undefined reference to `fb_set_suspend'

In addition to DRM_CLIENT_LIB, the 'select' needs to be at least in
two more parts, DRM_KMS_HELPER and DRM_GEM_SHMEM_HELPER, so add those
here.

Fixes: dadd28d4142f ("drm/client: Add client-lib module")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
v2: keep the select in DRM_CLIENT_LIB, keep alphabetic sorting
---
 drivers/gpu/drm/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index a4a092ee70d9..410bd6d78408 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -98,6 +98,7 @@ config DRM_KUNIT_TEST
 config DRM_KMS_HELPER
 	tristate
 	depends on DRM
+	select FB_CORE if DRM_FBDEV_EMULATION
 	help
 	  CRTC helpers for KMS drivers.

@@ -371,6 +372,7 @@ config DRM_GEM_DMA_HELPER
 config DRM_GEM_SHMEM_HELPER
 	tristate
 	depends on DRM && MMU
+	select FB_CORE if DRM_FBDEV_EMULATION
 	select FB_SYSMEM_HELPERS_DEFERRED if DRM_FBDEV_EMULATION
 	help
 	  Choose this if you need the GEM shmem helper functions
-- 
2.39.5