$ kpatch-build/kpatch-build -s ~/git/linux ~/meminfo-string.patch
Using source directory at /home/jpoimboe/git/linux
Testing patch file
checking file fs/proc/meminfo.c
Hunk #1 succeeded at 134 (offset 39 lines).
Building original kernel
bark
Building patched kernel
Extracting new and modified ELF sections
i915_gpu_error.o: changed function: i915_error_state_to_str
meminfo.o: changed function: meminfo_proc_show
ERROR: module.o: object size mismatch: vermagic
/home/jpoimboe/git/kpatch/kpatch-build/create-diff-object: unreconcilable difference
trace.o: changed function: print_trace_header
/home/jpoimboe/git/kpatch/kpatch-build/create-diff-object: ERROR: trace.o: kpatch_create_mcount_sections: 2592: function 'print_trace_header' has no fentry call; unable to patch
sys.o: changed function: override_release.part.8
ERROR: 2 error(s) encountered. Check /tmp/kpatch-build-1421953394.log for more details.