Bug#976638: still impossible to build module with 5.0.9-4

[orl at ammd.net]

Hi!
Just upgraded from buster to bullseye yesterday, and it fails on 
building nvidia kernel module due to some conf file missing in 
linux-headers-5.0.9-4-amd64.

(selected) Output of 
/var/lib/dkms/nvidia-legacy-340xx/340.108/build/make.log:

make -f /usr/src/linux-headers-5.9.0-4-common/scripts/Makefile.modpost
   sed 's/ko$/o/' 
/var/lib/dkms/nvidia-legacy-340xx/340.108/build/modules.order | 
scripts/mod/modpost -m    -o /var/lib/dkms/nv
idia-legacy-340xx/340.108/build/Module.symvers -e -i Module.symvers   -T 
-
ERROR: modpost: "drm_legacy_pci_exit" 
[/var/lib/dkms/nvidia-legacy-340xx/340.108/build/nvidia.ko] undefined!
ERROR: modpost: "drm_legacy_pci_init" 
[/var/lib/dkms/nvidia-legacy-340xx/340.108/build/nvidia.ko] undefined!
make[3]: *** 
[/usr/src/linux-headers-5.9.0-4-common/scripts/Makefile.modpost:111 : 
/var/lib/dkms/nvidia-legacy-340xx/340.108/build/Module.symvers] Erreur 1
make[3]: *** Suppression du fichier 
« /var/lib/dkms/nvidia-legacy-340xx/340.108/build/Module.symvers »
make[2]: *** [/usr/src/linux-headers-5.9.0-4-common/Makefile:1709 : 
modules] Erreur 2
make[2] : on quitte le répertoire 
« /usr/src/linux-headers-5.9.0-4-amd64 »
make[1]: *** [Makefile:185 : __sub-make] Erreur 2
make[1] : on quitte le répertoire 
« /usr/src/linux-headers-5.9.0-4-common »
make: *** [Makefile:209 : nvidia.ko] Erreur 2
make : on entre dans le répertoire 
« /var/lib/dkms/nvidia-legacy-340xx/340.108/build/uvm »
cd ./..; make module SYSSRC=/lib/modules/5.9.0-4-amd64/source 
SYSOUT=/lib/modules/5.9.0-4-amd64/build KBUILD_EXTMOD=./..
make[1] : on entre dans le répertoire 
« /var/lib/dkms/nvidia-legacy-340xx/340.108/build »
NVIDIA: calling KBUILD...
make NV_MODULE_SUFFIX= KBUILD_OUTPUT=/lib/modules/5.9.0-4-amd64/build 
KERNEL_SOURCES=/lib/modules/5.9.0-4-amd64/source 
KERNEL_OUTPUT=/lib/modules/5.9.0-4-amd64/build KBUILD_VERBOSE=1 -C 
/lib/modules/5.9.0-4-amd64/source 
M=/var/lib/dkms/nvidia-legacy-340xx/340.108/build ARCH=x86_64 modules
make[2] : on entre dans le répertoire 
« /usr/src/linux-headers-5.9.0-4-common »
make -C /usr/src/linux-headers-5.9.0-4-amd64 -f 
/usr/src/linux-headers-5.9.0-4-common/Makefile modules
make[3] : on entre dans le répertoire 
« /usr/src/linux-headers-5.9.0-4-amd64 »
test -e include/generated/autoconf.h -a -e include/config/auto.conf || ( 
                \
echo >&2;                                                       \
echo >&2 "  ERROR: Kernel configuration is invalid.";           \
echo >&2 "         include/generated/autoconf.h or 
include/config/auto.conf are missing.";\
echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to 
fix it.";      \
echo >&2 ;                                                      \
/bin/false)
make -f /usr/src/linux-headers-5.9.0-4-common/scripts/Makefile.build 
obj=.. \
single-build= \
need-builtin=1 need-modorder=1
/usr/src/linux-headers-5.9.0-4-common/scripts/Makefile.build:44: 
/usr/src/linux-headers-5.9.0-4-common/../Makefile: Aucun fichier ou 
dossier de ce type
make[4]: *** Aucune règle pour fabriquer la cible 
« /usr/src/linux-headers-5.9.0-4-common/../Makefile ». Arrêt.
make[3]: *** [/usr/src/linux-headers-5.9.0-4-common/Makefile:1796 : ..] 
Erreur 2
make[3] : on quitte le répertoire 
« /usr/src/linux-headers-5.9.0-4-amd64 »
make[2]: *** [Makefile:185 : __sub-make] Erreur 2
make[2] : on quitte le répertoire 
« /usr/src/linux-headers-5.9.0-4-common »
make[1]: *** [Makefile:209 : nvidia.ko] Erreur 2
make[1] : on quitte le répertoire 
« /var/lib/dkms/nvidia-legacy-340xx/340.108/build »
make: *** [Makefile:225 : ../Module.symvers] Erreur 2
make : on quitte le répertoire 
« /var/lib/dkms/nvidia-legacy-340xx/340.108/build/uvm »


When trying to run 'make oldconfig && make prepare' on kernel src to fix 
it, I get:

$> make oldconfig && make prepare
sh: 0: cannot open 
/usr/src/linux-headers-5.9.0-4-common/scripts/mkmakefile: No such file
make[1]: *** [/usr/src/linux-headers-5.9.0-4-common/Makefile:552 : 
outputmakefile] Erreur 2
make: *** [/usr/src/linux-headers-5.9.0-4-common/Makefile:185 : 
__sub-make] Erreur 2

If need be, I can send you my whole config (don't want to spam the 
answers with it)

Thanks.
Aurélien