[adding kbuild list and maintainer] On 8/18/20 9:09 AM, Martin Burnicki wrote: > Hi, > > I'm the maintainer of a driver package for some PCI cards (GPS receiver > cards, etc.). A read-only git repo of the driver package can be found here: > https://git.meinbergglobal.com/mbgtools-lx.git > > The kernel driver from that package is compiled as out-of-tree module, > and runs fine on kernels 2.6, 3.x, 4.x, and 5.x up to 5.7, actually > 5.7.15 on Ubuntu. > > However, if I try this on kernel 5.8.1, I get strange errors related to > autoconf.h, which make it impossible to compile or install the kernel > module. > > I usually build the kernel module as standard user, and only install the > new module as root, e.g.: > > git checkout devel # The 'devel' branch is appropriate for testing > cd mbgclock # the subdirectory of the kernel module > git clean -fd; make # or make V=1 for verbose output > sudo make install > > Also, I was under the impression that the kernel source tree should be > read-only, and kept clean, but this doesn't seem to be the case anymore. > > > For example: > > On Ubuntu 19.10 with kernel 5.8.1-050801-generic from > https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.8.1/ > > 'make' completes without error, even if run as normal user without write > permissions in the kernel source tree. > > 'sudo insmod ./mbgclock.ko' loads the module successfully, and the PCI > card can be accessed as usually, e.g. using the 'mbgstatus' program, so > the compiled kernel module is OK. > > BUT: Once I run 'sudo make install', which calls the kernel build system > to make 'modules_install', I immediately get an error: > > ------------------------------------------------------------------------- > Calling kernel build system to make "modules_install" > make[1]: Entering directory '/usr/src/linux-headers-5.8.1-050801-generic' > > ERROR: Kernel configuration is invalid. > include/generated/autoconf.h or include/config/auto.conf are > missing. > Run 'make oldconfig && make prepare' on kernel src to fix it. > > make[1]: *** [Makefile:719: include/config/auto.conf] Error 1 > make[1]: Leaving directory '/usr/src/linux-headers-5.8.1-050801-generic' > make: *** [/home/martin/projects/mbgtools-lx/mbgclock/../Makefile:834: > install_module] Error 2 > ------------------------------------------------------------------------- > > And once this has happened, this problem persists, i.e., if I run the > same commands > > git clean -fd; make > > once more, as normal user as mentioned above, I get the error above > every time. > > Also, If I initially try to build the kernel kernel module as root, with > 'sudo': > > git clean -fd; sudo make > > I immediately get this error, and the module is not built. Only after I > have re-installed the kernel headers package, I can compile the module > again. > > > A diff between the kernel header files before and after the kernel build > system has been messed up shows that the following files have changed: > > include/generated/autoconf.h > scripts/basic/.fixdep.cmd > scripts/basic/fixdep > scripts/kconfig/.conf.o.cmd > scripts/kconfig/.confdata.o.cmd > scripts/kconfig/.expr.o.cmd > scripts/kconfig/.lexer.lex.c.cmd > scripts/kconfig/conf.o > scripts/kconfig/confdata.o > scripts/kconfig/expr.o > scripts/kconfig/lexer.lex.c > scripts/kconfig/parser.tab.c > > Specifically, autoconf.h has been deleted even though some script > obviously still requires that the file is available. > > > With openSUSE Leap 15.2 and kernel 5.8.1 from > https://download.opensuse.org/repositories/Kernel:/stable/standard/ > > I've encountered similar problems because include/generated/autoconf.h > is not even available after installation of the kernel headers package. > > Only on Arch Linux with kernel 5.8.1-arch1-1 I can build and install the > module as root or standard user, as it was possible with earlier kernel > versions. > > Can someone please shed some light on what's going on here? > > > Thanks, > > Martin > -- ~Randy Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
