v4l2loopback tested 0.12.7-2ubuntu2~22.04.1 to build on ga & hwe kernels in jammy.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to zfs-linux in Ubuntu. https://bugs.launchpad.net/bugs/1991664 Title: backport dkms fixes to build modules correctly for hwe-5.19+ kernels with custom compiler Status in backport-iwlwifi-dkms package in Ubuntu: Fix Released Status in dkms package in Ubuntu: Fix Released Status in ipu6-drivers package in Ubuntu: New Status in ivsc-driver package in Ubuntu: New Status in linux package in Ubuntu: Fix Released Status in v4l2loopback package in Ubuntu: Fix Released Status in zfs-linux package in Ubuntu: Fix Released Status in backport-iwlwifi-dkms source package in Jammy: New Status in dkms source package in Jammy: Fix Released Status in ipu6-drivers source package in Jammy: New Status in ivsc-driver source package in Jammy: New Status in linux source package in Jammy: Incomplete Status in v4l2loopback source package in Jammy: Fix Committed Status in zfs-linux source package in Jammy: New Bug description: tl; dr this has proven to be a bit futile, and instead we went ahead with changing the default kernel makefiles to default to the correct toolchain and we have reverted hwe-5.19 kernel to use stock gcc on jammy for now. So the things described here are not strictly even needed in jammy for now. [ Impact ] * hwe-5.19 kernel has to be compiled with gcc-12+ for the new security kernel config options that have been enabled in that kernel (init zero structs). * dkms needs to be patched to attempt to use the same compiler as was used to build the kernel, specifically use gcc for v5.15 but gcc-12 for v5.19+ in jammy * dkms autopkgtests also need to be improved to ensure there are no false negatives when kernel has module under test already built-in at the same version. * because linux-headers packages in Ubuntu do not depend on a toolchain, and it is very hard to correctly depend on a native or cross-toolchain, add gcc-12 dependency in the dkms package. [ Test Plan ] * Retrigger dkms module test for a built-in package of the same version as already built into the kernel, for example zfs-linux dkms. It should pass. * Attempt to build dkms modules against v5.15 kernel and v5.19 kernel from proposed. dkms module should be built with gcc and gcc-12 respectively. [ Where problems could occur ] * New gcc-12 dependency on the dkms package may result in two compilers being installed in the Ubuntu Desktop Live image * New gcc-12 dependency may prevent automatic upgrade/installation of the dkms package update via unattended upgrades. [ Other Info ] * It is questionable for dkms to depend on any c-compiler, given that a module for a given kernel can really be built with the same toolchain and the same compiler features. * In debian, linux kernel packages ship and extra configuration file in the kernel headers, dkms uses said configuration file to use a matching compiler, and linux-headers packages depend on the toolchain used to build a given kernel. Maybe in the future Ubuntu could consider using the same packaging. * Some DKMS modules need further fixes to preserve and not loose the compiler setting To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/backport-iwlwifi-dkms/+bug/1991664/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
