mirror of https://github.com/dynup/kpatch
4835e3edc3
This commit enables the ability to create user-defined hooks as part of the normal code patch that can do preparatory work for the application of the patch. This work could include, but is not limited to, changing data structure semantics. The user may define a new function as part of the patch and mark it as a load-time or unload-time hook with the kpatch_load_hook() and kpatch_unload_hook() macros. These macros are in an include file that gets copied into the source tree at include/linux/kpatch-hooks.h at patch build time. The signature for both hooks is "int kpatch_unload_hook(void)". For now, the return code is ignored. The hooks may not fail. They also run in stop_machine() context and may not sleep. These hooks, more or less, must follow all the rules of interrupt context code. |
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