------- Comment on attachment From [email protected] 2018-01-09 01:40
EDT-------
When attempting to load a livepatch module, I got the following error:
module_64: patch_module: Expect noop after relocate, got 3c820000
The error was triggered by the following code in
unregister_netdevice_queue():
14c: 00 00 00 48 b 14c <unregister_netdevice_queue+0x14c>
14c: R_PPC64_REL24 net_set_todo
150: 00 00 82 3c addis r4,r2,0
GCC didn't insert a nop after the branch to net_set_todo() because it's
a sibling call, so it never returns. The nop isn't needed after the
branch in that case.
** Attachment added: "[2/3] powerpc/modules: Don't try to restore r2 after a
sibling call"
https://bugs.launchpad.net/bugs/1741992/+attachment/5033176/+files/0002-powerpc-modules-Don-t-try-to-restore-r2-after-a-sibl.patch
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https://bugs.launchpad.net/bugs/1741992
Title:
kpatch - Add livepatch hook support for ppc64le
Status in The Ubuntu-power-systems project:
Triaged
Status in linux package in Ubuntu:
New
Bug description:
kpatch is a Linux dynamic kernel patching infrastructure which allows
you to patch a running kernel without rebooting or restarting any
processes. It enables sysadmins to apply critical security patches to
the kernel immediately, without having to wait for long-running tasks
to complete, for users to log off, or for scheduled reboot windows. It
gives more control over uptime without sacrificing security or
stability.
kpatch is upstream hosted at
https://github.com/dynup/kpatch
https://github.com/dynup/kpatch/releases
Add support for livepatch infrastructure on ppc64le
https://github.com/dynup/kpatch/pull/650
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