Elaborate on the difficulties in using locks/mutexes from the kpatch
callback routines and suggest a few workarounds.
Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
Upstream 4.15 kernels provide support for pre and post (un)patch
callbacks, inspired by the kpatch load hooks. Add support for them
in the livepatch-patch-hook.
At the same time, convert the kpatch hooks to use the same API.
Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
I couldn't find a good place in the document for this, so I just added
an "Other issues" section at the end.
Fixes#738.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
This was discovered when trying to patch a netfilter issue and resulted in the following issue:
https://github.com/dynup/kpatch/issues/599
This patch adds some documentation in case this situation is encountered in the future.
