Public bug reported: [Impact]
* A change of kernel symbol license allows to drop a PPC specific workaround in zfs-dkms to use the regular (better) code paths. * See details in: https://git.launchpad.net/ubuntu/+source/zfs- linux/tree/debian/patches/4900-ppc-get-user-workaround.patch https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1009242 [Test Plan] * linux: apply https://github.com/torvalds/linux/commit/d9e5c3e9e75162f845880535957b7fd0b4637d23 * zfs-dkms: revert https://git.launchpad.net/ubuntu/+source/zfs- linux/tree/debian/patches/4900-ppc-get-user-workaround.patch * Build on kernel with zfs module on ppc * Ensure that zfs.ko successfully loads and works * Test that root on zfs installations work on ppc (however, Ubuntu currently doesn't provide an installation method to achieve this, so this bit of verification might be hard to complete) [Where problems could occur] * linux: the patch only changes the symbol licensing and the potential tainteness status of the kernel, without any observable user or kernel space impacts * zfs-dkms: The PPC workaround patch is known to be buggy, and the new arch-independent codepath may now use optimized codepaths inside kernel resulting in a different behavior as observed by user-space (operation successful, EFAULT not returned) matching the behavior of all other architectures. ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Affects: zfs-linux (Ubuntu) Importance: Undecided Status: New ** Also affects: linux (Ubuntu) Importance: Undecided Status: New ** Description changed: [Impact] - * A change of kernel symbol license allows to drop a PPC specific + * A change of kernel symbol license allows to drop a PPC specific workaround in zfs-dkms to use the regular (better) code paths. - * See details in: + * See details in: https://git.launchpad.net/ubuntu/+source/zfs- linux/tree/debian/patches/4900-ppc-get-user-workaround.patch https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1009242 - [Test Plan] - * linux: apply https://github.com/torvalds/linux/commit/d9e5c3e9e75162f845880535957b7fd0b4637d23 - - * zfs-dkms: revert https://git.launchpad.net/ubuntu/+source/zfs-linux/tree/debian/patches/4900-ppc-get-user-workaround.patch + * linux: apply + https://github.com/torvalds/linux/commit/d9e5c3e9e75162f845880535957b7fd0b4637d23 - * Build on kernel with zfs module on ppc + * zfs-dkms: revert https://git.launchpad.net/ubuntu/+source/zfs- + linux/tree/debian/patches/4900-ppc-get-user-workaround.patch - * Ensure that zfs.ko successfully loads and works + * Build on kernel with zfs module on ppc - * Test that root on zfs installations work on ppc (however, Ubuntu + * Ensure that zfs.ko successfully loads and works + + * Test that root on zfs installations work on ppc (however, Ubuntu currently doesn't provide an installation method to achieve this, so this bit of verification might be hard to complete) [Where problems could occur] - * The PPC workaround patch is known to be buggy, and the new arch- - independent codepath may now use optimized codepaths inside kernel + * linux: the patch only changes the symbol licensing and the potential + tainteness status of the kernel, without any observable user or kernel + space impacts + + * zfs-dkms: The PPC workaround patch is known to be buggy, and the new + arch-independent codepath may now use optimized codepaths inside kernel resulting in a different behavior as observed by user-space (operation successful, EFAULT not returned) matching the behavior of all other architectures. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1976248 Title: Revert PPC get_user workaround To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1976248/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
