Arnd Bergmann <arnd@xxxxxxxx> writes: > Ah right, I ran into a similar thing on my randconfig builds, this is > what I have > applied locally but wasn't completely sure about yet, it may need additional > 'select DRM_KMS_CMA_HELPER' to cover all instances: With 5.15.3, I had these errors on *one* of my boxes with Nvidia drivers when building the nvidia drivers Gentoo, nvidia-drivers-470.86 ERROR: modpost: "drm_atomic_helper_update_plane" [/work/tmp/portage/x11-drivers/nvidia-drivers-470.86/work/kernel/nvidia-drm.ko] undefined! ERROR: modpost: "drm_atomic_helper_connector_reset" [/work/tmp/portage/x11-drivers/nvidia-drivers-470.86/work/kernel/nvidia-drm.ko] undefined! ERROR: modpost: "drm_atomic_helper_page_flip" [/work/tmp/portage/x11-drivers/nvidia-drivers-470.86/work/kernel/nvidia-drm.ko] undefined! ERROR: modpost: "drm_atomic_helper_swap_state" [/work/tmp/portage/x11-drivers/nvidia-drivers-470.86/work/kernel/nvidia-drm.ko] undefined! ERROR: modpost: "drm_helper_probe_single_connector_modes" [/work/tmp/portage/x11-drivers/nvidia-drivers-470.86/work/kernel/nvidia-drm.ko] undefined! ERROR: modpost: "drm_kms_helper_hotplug_event" [/work/tmp/portage/x11-drivers/nvidia-drivers-470.86/work/kernel/nvidia-drm.ko] undefined! ERROR: modpost: "__drm_atomic_helper_crtc_destroy_state" [/work/tmp/portage/x11-drivers/nvidia-drivers-470.86/work/kernel/nvidia-drm.ko] undefined! ERROR: modpost: "drm_atomic_helper_crtc_reset" [/work/tmp/portage/x11-drivers/nvidia-drivers-470.86/work/kernel/nvidia-drm.ko] undefined! ERROR: modpost: "__drm_atomic_helper_plane_duplicate_state" [/work/tmp/portage/x11-drivers/nvidia-drivers-470.86/work/kernel/nvidia-drm.ko] undefined! ERROR: modpost: "drm_atomic_helper_connector_duplicate_state" [/work/tmp/portage/x11-drivers/nvidia-drivers-470.86/work/kernel/nvidia-drm.ko] undefined! WARNING: modpost: suppressed 12 unresolved symbol warnings because there were too many) After "make oldconfig", many DRM settings have been lost. Enabling "CONFIG_DRM_CIRRUS_QEMU" gets them back, though a better way should be found. $ uname -a Linux bilbo 5.15.2 #3 SMP PREEMPT Fri Nov 12 14:41:08 GMT 2021 x86_64 AMD FX(tm)-4300 Quad-Core Processor AuthenticAMD GNU/Linux $ zcat /proc/config.gz > .config $ grep CONFIG_DRM .config | grep -v "is not set$" CONFIG_DRM=m CONFIG_DRM_KMS_HELPER=m CONFIG_DRM_FBDEV_EMULATION=y CONFIG_DRM_FBDEV_OVERALLOC=100 CONFIG_DRM_I2C_CH7006=m CONFIG_DRM_I2C_SIL164=m CONFIG_DRM_PANEL=y CONFIG_DRM_BRIDGE=y CONFIG_DRM_PANEL_BRIDGE=y CONFIG_DRM_PANEL_ORIENTATION_QUIRKS=m $ make oldconfig # # configuration written to .config # $ grep CONFIG_DRM .config | grep -v "is not set$" CONFIG_DRM=m CONFIG_DRM_BRIDGE=y CONFIG_DRM_PANEL_ORIENTATION_QUIRKS=m Comparing with the working system, that has VMM installed, and hence CONFIG_DRM_CIRRUS_QEMU=m Setting this and things are working again. $ zcat /proc/config.gz > .config $ ./scripts/config --enable CONFIG_DRM_CIRRUS_QEMU $ make oldconfig # # configuration written to .config # $ grep CONFIG_DRM .config | grep -v "is not set$" CONFIG_DRM=m CONFIG_DRM_KMS_HELPER=m CONFIG_DRM_FBDEV_EMULATION=y CONFIG_DRM_FBDEV_OVERALLOC=100 CONFIG_DRM_GEM_SHMEM_HELPER=y CONFIG_DRM_I2C_CH7006=m CONFIG_DRM_I2C_SIL164=m CONFIG_DRM_PANEL=y CONFIG_DRM_BRIDGE=y CONFIG_DRM_PANEL_BRIDGE=y CONFIG_DRM_CIRRUS_QEMU=m CONFIG_DRM_PANEL_ORIENTATION_QUIRKS=m $ -- Alan J. Wylie https://www.wylie.me.uk/ Dance like no-one's watching. / Encrypt like everyone is. Security is inversely proportional to convenience
