This patchset is a simplified livepatch port of kpatch's "shadow" variable API [1]. The kpatch project has successfully employed such shadow variables to implement patches that have extended data structure elements. This API provides livepatch a means of associating new, shadow data fields with existing data structures.
See the first patch for the implementation, the second for further documentation (API, conccurency notes, use-case code snippets) and the third patch for an update to the sample livepatch module using shadow variables. [1] https://github.com/dynup/kpatch/blob/master/kmod/core/shadow.c Joe Lawrence (3): livepatch: introduce shadow variable API livepatch: add shadow variable documentation livepatch: add shadow variable sample program Documentation/livepatch/shadow-vars.txt | 175 ++++++++++++++++++++++++++++++++ include/linux/livepatch.h | 4 + kernel/livepatch/Makefile | 2 +- kernel/livepatch/shadow.c | 115 +++++++++++++++++++++ samples/livepatch/livepatch-sample.c | 39 ++++++- 5 files changed, 333 insertions(+), 2 deletions(-) create mode 100644 Documentation/livepatch/shadow-vars.txt create mode 100644 kernel/livepatch/shadow.c -- 1.8.3.1
